COSTAR GROUP, INC. (CSGP) 13F Holdings

Industrials · Services-Business Services, NEC

Institutional ownership and 13F holdings context for COSTAR GROUP, INC. (CSGP) on InvestAtlant.

Top institutional holders (2026-Q2)

Institution	Shares	Value	% Outstanding
VANGUARD PORTFOLIO MANAGEMENT LLC	37,914,844	.07B	9.36%
BlackRock, Inc.	33,833,470	$957.61M	8.35%
VANGUARD CAPITAL MANAGEMENT LLC	26,683,792	$755.68M	6.59%
BAMCO INC /NY/	21,626,763	$612.47M	5.34%
State Street Corp	18,410,876	$521.40M	4.54%
Capital International Investors	16,643,016	$471.33M	4.11%
BAILLIE GIFFORD & CO	13,154,165	$372.53M	3.25%
GEODE CAPITAL MANAGEMENT, LLC	12,166,469	$343.30M	3.00%

Loading users…

Email	Name	Role	Plan	Status

Getting Started Data & Research Watchlist & Accounts Financial Information Premium Support

Getting Started

What is InvestAtlant?

InvestAtlant surfaces publicly disclosed trades and the research behind them, helping you see what institutions and insiders are buying or selling, which securities they are moving into, and when. The platform also tracks publicly disclosed stock trades by members of Congress, including transactions reported through Periodic Transaction Reports (PTRs) under the STOCK Act — alongside stock charts, fundamentals, and SEC filings in one workspace.

Who is InvestAtlant for?

Investors, researchers, analysts, traders, and anyone interested in understanding publicly disclosed market activity.

Do I need an account to use InvestAtlant?

You can browse research views, signals, and public market data without signing in. Creating an account unlocks a saved Watchlist and account settings (email verification, password reset, and profile). Sign-in is free.

Is InvestAtlant free?

Yes — currently everything is free. Some features may move behind Premium in the future. See Premium for more.

Data & Research

Where does InvestAtlant get its data?

InvestAtlant is built primarily on publicly available disclosures — including SEC filings such as institutional Form 13F holdings, Form 4 insider transactions, company fundamentals from 10-K / 10-Q (and related XBRL), and publicly reported congressional / political trading disclosures — plus market price data used for charts and context. For a fuller list, see Data Sources.

How often is the data updated?

Update cadence depends on the source. Market prices refresh more frequently during trading hours. Insider (Form 4) and political disclosures are ingested on a recurring schedule as new filings appear. Institutional 13F data follows the SEC reporting calendar and is updated as new quarterly filings are published and processed. Exact pipelines and timing are described on Methodology.

What are institutional transactions?

On InvestAtlant, “institutional” activity usually refers to holdings and changes reported by large investment managers in SEC Form 13F filings — for example new positions, increased or reduced stakes, or exits between reporting periods. These are delayed public disclosures of portfolio holdings, not real-time trade tickets.

What are insider transactions?

Insider transactions are trades and related filings by company officers, directors, and certain beneficial owners, typically reported on SEC Form 4. InvestAtlant surfaces publicly disclosed trades and the research behind them, helping you see what insiders are buying or selling, which securities they are moving into, and when.

What is political activity?

The platform tracks publicly disclosed stock trades by members of Congress, including transactions reported through Periodic Transaction Reports (PTRs) under the STOCK Act. These are delayed public filings, not live brokerage feeds.

How do you calculate changes in holdings?

Holding changes are derived by comparing reported positions across filing periods (for example share counts or estimated values between consecutive 13F quarters). Labels such as new, increased, reduced, or sold are based on those period-to-period comparisons. Step-by-step rules live on Methodology.

Why might InvestAtlant's data differ from another website?

Sites may use different filing cutoffs, ticker mappings, share-class handling, amendment timing, currency/unit conventions, or inclusion rules for certain instruments. InvestAtlant focuses on publicly disclosed filings and its own normalization rules — so totals or “change” labels can differ even when both sources are legitimate.

What happens when a filing is amended or corrected?

When an amended or corrected filing is ingested, InvestAtlant updates the relevant records to reflect the latest disclosed information. Historical views may change after amendments land. Processing details are covered in Methodology.

Watchlist & Accounts

How does my Watchlist work?

Your Watchlist is a personal list of tickers you want to follow. Add or remove symbols from the Watchlist panel, then open any symbol for charts, ownership, insiders, signals, and filings. Signed-in users keep a saved Watchlist tied to their account.

Can I use InvestAtlant without creating an account?

Yes. Much of the research experience is available without an account. An account is mainly for saving your Watchlist and managing login settings.

What happens to my Watchlist when I create an account?

After you register and sign in, your Watchlist can be saved with your account so it is available the next time you log in. If you browsed as a guest first, create an account when you are ready to keep those symbols permanently.

How do I delete my account?

Contact us at Contact and request account deletion. We will process the request and remove account data as described in our Privacy Policy.

How do I reset my password?

Use Forgot password on the login page. Enter the email on your account and follow the reset link we send you.

How do I verify my email?

After you register, open the verification link sent to your inbox. If you need a new link, return to the check-email / verification flow from registration or contact support via Contact.

Financial Information

Is InvestAtlant financial advice?

No. InvestAtlant provides research tools and publicly available information for informational purposes only. Nothing on the platform is personalized investment advice. See our Disclaimer.

Should I make investment decisions based on InvestAtlant data?

You should not rely solely on InvestAtlant (or any single research tool) when making investment decisions. Disclosures can be delayed, incomplete, or later amended. Always do your own research and, if needed, consult a qualified professional.

Does InvestAtlant recommend stocks?

No. InvestAtlant does not recommend buying or selling any security. Screens, signals, and rankings are research views over public data — not personalized recommendations.

Premium

What is InvestAtlant Premium?

Premium is the paid plan for InvestAtlant. Upgrade on the Premium page — checkout is handled by Stripe. Some features that are free today may move behind Premium later.

How much does Premium cost?

See the live price on Premium. Billing is monthly through Stripe.

How do I upgrade?

Create a free account, open Premium, and click Upgrade to Premium to complete Stripe Checkout.

Will the features currently available for free remain free?

Some features that are free today may become Premium features later. We are not implying those capabilities are unfinished — they already exist; we may simply move some of them behind Premium over time.

Support

Still have questions?

Can't find what you're looking for? Contact us and we'll be happy to help.

Contact Support

Overview Data Sources Institutional Holdings Insider Transactions Political Activity Normalization Change Calculations Filing vs Transaction Dates Amendments Limitations Updates What We Don't Do

1. Overview

InvestAtlant aggregates and organizes publicly available financial and government disclosures to make institutional, insider, and political activity easier to research — alongside charts, fundamentals, and related SEC context in one workspace.

InvestAtlant does not create the underlying disclosures. We process, normalize, and present information from public sources so filings can be compared across periods, filers, and tickers.

2. Data Sources

InvestAtlant is built on sources we actually ingest or display. The main categories are:

Institutional activity

SEC Form 13F filings (including 13F-HR and related amendments when ingested)
Institutional investment manager holdings reported in those filings
Related SEC submissions metadata used to discover and process filings

Insider activity

SEC Form 4 transaction filings (primary source for insider buys, sells, and other reported codes)
Forms 3 and 5 are part of the broader SEC beneficial-ownership reporting regime; InvestAtlant's transaction research and signal views focus on Form 4 activity

Political activity

Official congressional financial disclosures (for example House PTR PDFs and Senate EFD reports)
Other applicable public government disclosure sources used by our politician ingest pipeline

Fundamentals & market context

Company financials from SEC Company Facts XBRL (for example metrics used in Filings → Fundamentals and related tools)
Market context via TradingView for interactive charts
Reported institutional position values primarily come from Form 13F filings, not from inventing real-time portfolio marks

A user-facing summary of sources also lives on Data Sources.

3. Institutional Holdings

Institutional holdings are derived from publicly filed Form 13F reports. InvestAtlant extracts reported securities, share (or contract) quantities, and reported values, then normalizes them into a consistent format so positions can be compared across reporting periods and managers.

From consecutive reporting periods we classify activity such as:

New positions — a security appears in the later period but not the prior period
Increased / add — shares held rise versus the prior period
Reduced / trim — shares held fall versus the prior period but remain above zero
Sold-out / exited — a prior position is no longer reported in the later period

We also surface fields commonly used in research views:

Shares held — reported position size for the period
Position value — reported filing value, normalized to USD where needed
Quarter-over-quarter changes — share and (when available) value deltas between periods

Sold-out detection depends on having comparable period coverage for a filer. Missing filings are not treated as exits.

4. Insider Transactions

Insider transactions on InvestAtlant come primarily from SEC Form 4 filings. Each row includes transaction codes and acquisition/disposition flags that describe what happened.

Common classifications include:

Purchases — open-market / private purchase (code P)
Sales — open-market / private sale (code S)
Option exercises — for example code M
Grants / awards — for example code A
Other types — gifts, tax withholdings, and other Form 4 codes when present

Not every Form 4 row is a discretionary buy or sell. Awards, option exercises, gifts, and share withholdings can appear in filings without representing an open-market trade. Research views and signals that focus on “buying” or “selling” typically emphasize open-market codes P and S unless a page explicitly includes other transaction types.

5. Political Activity

InvestAtlant uses publicly available financial disclosures to organize reported securities activity associated with members of Congress and other covered political figures.

Where available, we capture and display:

Reported transactions (for example purchase / sale type)
Transaction date and filing / disclosure date
Security identification (name / ticker when provided)
Reported amount ranges
Amendments when a later disclosure replaces or updates earlier information

Political transactions are often reported as dollar ranges, not exact amounts. InvestAtlant preserves the reported range (and derived min/max bounds). Some analytics may use a midpoint estimate for ranking or aggregation — that estimate is derived from the disclosed range and is not an exact trade size from a brokerage confirmation.

6. Normalization

Raw filings are not always clean or consistent across issuers, filers, and disclosure systems. InvestAtlant may normalize fields such as:

Company names and ticker symbols
CUSIPs and other security identifiers
Security types (for example common stock vs options where distinguished)
Transaction types / codes
Dates (transaction, filing, period end)
Monetary values and share quantities (including 13F value unit handling)

Normalization exists to make different filings comparable in tables, charts, and change calculations. It does not change the underlying public disclosure — it maps that disclosure into a consistent research schema.

7. Change Calculations

When sufficient historical information is available, InvestAtlant calculates changes between reported institutional positions to identify increases, decreases, new positions, and exits.

Shares change: Current shares − Previous shares
Shares percentage change: ((Current shares − Previous shares) / Previous shares) × 100
If previous shares are missing or zero, percentage change is not shown.

Event labels such as new, add/trim, or sold-out are based on those period-to-period share comparisons (and presence/absence of a position), not on live trading activity after the filing date.

8. Filing Dates vs. Transaction Dates

These dates are easy to confuse — especially for 13F research:

Transaction date: When the underlying activity occurred (used heavily for Form 4 and political disclosures).
Filing / disclosure date: When the report was submitted or published to the public source.
Reporting period: The period a filing represents (for example a 13F calendar quarter). A 13F can be published well after the quarter ends.

Holdings shown for a quarter reflect what was reported for that period — not necessarily what a manager holds today.

9. Amendments & Corrections

Public filings can be amended or corrected after their initial submission. When an amended filing is available and processed by InvestAtlant, associated records may be updated to reflect the latest available disclosure.

As a result, historical tables, ownership totals, and change labels can change after amendments are ingested. Duplicate or previously seen filings are treated as no-ops where our ingest pipeline detects them.

10. Data Limitations

Transparency matters. Please keep these limitations in mind:

Filings are reported after the underlying activity occurs.
Some disclosures provide estimated or ranged values, not exact amounts.
Public filings can contain errors or incomplete identification.
Data may be delayed by filing calendars, processing time, or source availability.
Security identification (ticker / CUSIP / name) can sometimes be ambiguous.
Historical information can change when filings are amended.
Reported holdings do not necessarily represent current holdings.

11. Updates

InvestAtlant monitors applicable public filings and updates datasets as new disclosures become available and are processed. This is not a real-time brokerage feed.

In practice, scheduled jobs typically:

Refresh politician disclosures and Form 4 insider data on a recurring daily schedule, then warm related research caches
Process institutional 13F filings during filing windows (and via dedicated 13F ingest jobs), then rebuild ownership caches and institutional signal views
Ingest SEC fundamentals for tracked tickers on a recurring fundamentals job

Exact run times depend on deployment configuration. Charts and quote search refresh according to their market-data providers when those integrations are enabled.

12. What InvestAtlant Doesn't Do

InvestAtlant organizes and analyzes publicly available information. The platform does not determine whether a transaction is a good or bad investment, and the presence of an institutional, insider, or political transaction should not be interpreted as a recommendation to buy or sell a security.

For the full legal wording, see our Disclaimer.

1. Introduction

InvestAtlant (“we”, “us”, “our”) operates the website investatlant.com and related services (the “Service”). This Privacy Policy explains how we collect, use, store, and protect personal information when you visit or use InvestAtlant.

By using the Service, you acknowledge that you have read this Privacy Policy. If you do not agree, please do not use the Service.

2. Who is responsible

The operator of InvestAtlant is responsible for processing personal data described in this policy. For privacy-related questions or requests, contact us at contact@investatlant.com.

3. Information we collect

Account information

If you create an account, we may collect:

Name
Email address
Password (stored in hashed form)
Account status, verification state, and subscription tier where applicable

Usage and technical information

When you use InvestAtlant, we may automatically collect information such as:

IP address and approximate location derived from it
Browser type, device type, and operating system
Pages viewed, features used, and timestamps
Session and authentication identifiers necessary to operate the Service
Server and error logs for security, debugging, and reliability

Communications

If you contact us, we process the information you provide (such as your name, email address, and message content) so we can respond.

Public market data

InvestAtlant displays publicly available financial and government disclosure data (for example SEC filings, congressional disclosures, and market quotes). That information originates from public sources and is not personal data about you unless you appear in such public records in your own capacity.

4. How we use information

We use personal information to:

Provide, operate, and maintain the Service
Create and manage user accounts and authentication
Send service-related messages such as email verification and password reset emails
Respond to support requests and communicate with you
Protect the Service, prevent abuse, and enforce our terms
Improve reliability, performance, and user experience
Comply with legal obligations

We do not sell your personal information. We do not use your account data to provide personalized investment advice.

5. Legal bases (EEA/UK users)

Where applicable law requires a legal basis, we rely on:

Contract — to provide the Service you request, including account functionality
Legitimate interests — to secure, maintain, and improve the Service
Legal obligation — where we must retain or disclose information by law
Consent — where required for optional processing such as non-essential cookies

6. Cookies

We use cookies and similar technologies for essential functionality such as login sessions and security. For details, see our Cookie Policy.

We may share information with:

Hosting, infrastructure, and email delivery providers that help us operate the Service
Professional advisers where reasonably necessary
Authorities or other parties when required by law or to protect rights and safety

InvestAtlant integrates third-party data and tools where needed to provide research features (for example market charting or quote search). Those providers may process technical information according to their own policies when their services are loaded or used. See also our Data Sources page.

We require service providers to handle personal data only as needed to perform their services for us.

8. Retention

We retain personal information for as long as needed to provide the Service, comply with legal obligations, resolve disputes, and enforce agreements. Account data is generally kept while your account is active and for a reasonable period afterward unless deletion is requested or required.

9. Security

We use reasonable technical and organizational measures to protect personal information. No method of transmission or storage is completely secure, and we cannot guarantee absolute security.

10. Your rights

Depending on your location, you may have rights to:

Access the personal information we hold about you
Request correction or deletion
Object to or restrict certain processing
Withdraw consent where processing is consent-based
Request data portability where applicable
Lodge a complaint with a supervisory authority

To exercise these rights, contact contact@investatlant.com. You may also delete your account through the account settings flow or by contacting us as described in our FAQ.

11. International transfers

Your information may be processed in countries other than your own, including where our service providers operate. Where required, we use appropriate safeguards for cross-border transfers.

12. Children

InvestAtlant is not directed at children under 16, and we do not knowingly collect personal information from children. If you believe a child has provided us personal data, please contact us.

13. Changes

We may update this Privacy Policy from time to time. The latest version will be posted on this page with an updated date. Material changes may also be communicated where appropriate.

14. Contact

Privacy questions or requests:

contact@investatlant.com

1. Agreement

These Terms of Service (“Terms”) govern your access to and use of InvestAtlant, including investatlant.com and related services (the “Service”), operated by InvestAtlant (“we”, “us”, “our”).

By accessing or using the Service, you agree to these Terms and our Privacy Policy. If you do not agree, do not use the Service.

2. The Service

InvestAtlant is a financial research and market intelligence platform. We organize and present publicly available information — including institutional holdings, insider transactions, political disclosures, SEC filings, fundamentals, and related research views — to help users conduct their own research.

We may add, change, or remove features at any time. Some features may require an account; some may become part of a paid Premium plan in the future.

3. Eligibility

You must be at least 16 years old and able to form a binding contract to use the Service. You are responsible for ensuring that your use complies with applicable laws in your jurisdiction.

4. Accounts

If you create an account, you agree to:

Provide accurate and current information
Keep your login credentials confidential
Notify us promptly of unauthorized access to your account
Accept responsibility for activity under your account

We may suspend or terminate accounts that violate these Terms, pose a security risk, or are inactive for an extended period where permitted by law.

5. Acceptable use

You agree not to:

Use the Service for unlawful purposes
Attempt to gain unauthorized access to systems, accounts, or data
Scrape, crawl, or harvest the Service in a way that exceeds normal use or violates our robots rules
Interfere with or disrupt the Service or its infrastructure
Reverse engineer or copy the Service except where permitted by law
Misrepresent your identity or affiliation
Resell, sublicense, or commercially exploit the Service without our permission

Automated access may be restricted to protect service stability and comply with upstream data provider requirements.

6. Intellectual property

The Service, including its design, software, branding, and original content, is owned by InvestAtlant or its licensors and protected by applicable intellectual property laws.

Public disclosure data displayed on InvestAtlant remains subject to the terms of its original sources. We grant you a limited, non-exclusive, non-transferable license to access and use the Service for personal or internal business research in accordance with these Terms.

7. Third-party content and links

The Service may include data, tools, or links from third parties. We do not control and are not responsible for third-party content or services. Your use of third-party services may be subject to their separate terms.

8. No financial advice

InvestAtlant provides information and research tools only. Nothing on the Service constitutes investment, legal, tax, or other professional advice, nor a recommendation to buy or sell any security. See our Disclaimer.

9. Disclaimers

THE SERVICE IS PROVIDED “AS IS” AND “AS AVAILABLE” WITHOUT WARRANTIES OF ANY KIND, WHETHER EXPRESS OR IMPLIED, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. WE DO NOT WARRANT THAT THE SERVICE WILL BE UNINTERRUPTED, ERROR-FREE, COMPLETE, OR ACCURATE.

10. Limitation of liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW, INVESTATLANT AND ITS OPERATORS, DIRECTORS, EMPLOYEES, AND SUPPLIERS WILL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, OR ANY LOSS OF PROFITS, DATA, GOODWILL, OR OTHER INTANGIBLE LOSSES, ARISING FROM YOUR USE OF OR INABILITY TO USE THE SERVICE.

OUR TOTAL LIABILITY FOR ANY CLAIM RELATING TO THE SERVICE WILL NOT EXCEED THE GREATER OF (A) THE AMOUNT YOU PAID US IN THE TWELVE MONTHS BEFORE THE CLAIM OR (B) EUR 100, EXCEPT WHERE LIABILITY CANNOT BE LIMITED BY APPLICABLE LAW.

11. Indemnity

You agree to indemnify and hold harmless InvestAtlant from claims, damages, losses, and expenses (including reasonable legal fees) arising from your misuse of the Service or violation of these Terms, except to the extent caused by our intentional misconduct or where prohibited by law.

12. Termination

You may stop using the Service at any time. We may suspend or terminate access if you breach these Terms or if we discontinue the Service. Provisions that by nature should survive termination will remain in effect.

13. Changes

We may update these Terms from time to time. Continued use after changes take effect constitutes acceptance of the updated Terms, except where applicable law requires otherwise.

14. Governing law

These Terms are governed by the laws applicable to the operator of InvestAtlant, without regard to conflict of law principles. Mandatory consumer protection laws in your country of residence may still apply.

15. Contact

Questions about these Terms:

contact@investatlant.com

1. Informational purposes only

InvestAtlant provides financial research tools and publicly available information for informational and educational purposes only. Nothing on investatlant.com or related services constitutes investment advice, financial advice, trading advice, legal advice, tax advice, or any other form of professional recommendation.

InvestAtlant does not recommend that you buy, sell, or hold any security, nor does it take into account your personal financial situation, objectives, or risk tolerance.

2. No client relationship

Use of InvestAtlant does not create a fiduciary, advisory, broker-dealer, or client relationship between you and InvestAtlant. You are solely responsible for your investment and financial decisions.

3. Data accuracy and completeness

InvestAtlant aggregates data from public sources such as SEC filings, government disclosures, and market data providers. While we aim to present information clearly and consistently, we do not guarantee that any data is complete, current, accurate, or free from errors.

In particular:

Filings may be delayed, amended, corrected, or restated after initial publication
Different sources may classify, normalize, or report the same event differently
Charts, quotes, and fundamentals may be delayed or subject to provider limitations
Signals, rankings, and screens are derived views — not statements of fact about future performance

You should verify important information using primary source documents before relying on it. See our Methodology and Data Sources pages for how we process information.

4. No guarantee of results

Past institutional, insider, or political activity does not predict future results. Historical patterns, screens, and signals shown on InvestAtlant may not repeat and should not be interpreted as forecasts or endorsements.

5. Investment risk

Investing in securities involves risk, including the possible loss of principal. You should conduct your own research and consult qualified professionals before making financial decisions.

6. Third-party content

InvestAtlant may display or link to third-party content, tools, or websites. We do not control and are not responsible for third-party information, availability, or policies.

7. Limitation of liability

To the fullest extent permitted by law, InvestAtlant and its operators will not be liable for any loss or damage arising from reliance on information available through the Service, including trading losses or missed opportunities. Your use of the Service is at your own risk.

8. Changes

We may update this Disclaimer from time to time. The latest version will be published on this page with an updated date.

9. Contact

Questions about this Disclaimer:

contact@investatlant.com

Service provider

Information pursuant to § 5 TMG and § 18 Abs. 2 MStV:

InvestAtlant
Financial research & market intelligence
Website: investatlant.com

A full postal address for the operator is available on request at contact@investatlant.com.

Contact

Email: contact@investatlant.com

General inquiries, support, and legal notices: Contact page

Responsible for content

Responsible for editorial content according to § 18 Abs. 2 MStV: the operator of InvestAtlant. Contact details are available at contact@investatlant.com.

Dispute resolution

The European Commission provides an online dispute resolution platform at ec.europa.eu/consumers/odr. We are not obliged or willing to participate in dispute resolution proceedings before a consumer arbitration board unless required by law.

Liability for content

We make reasonable efforts to keep the information on this website accurate and current. However, we assume no liability for the completeness, correctness, or timeliness of content, except where mandatory law provides otherwise. See also our Disclaimer.

Liability for links

This website may contain links to external third-party websites. We have no control over their content and therefore assume no liability for external content. The respective provider or operator of linked pages is always responsible for their content.

Copyright

Content and works created by InvestAtlant on this website are subject to applicable copyright law. Public disclosure data displayed on the platform remains subject to the terms of its original sources.

US equities research

Follow the money behind the market.

Public filings. Connected research. One workspace.

Click a source to open it in the workspace

InvestAtlant connects public filings, institutional activity, insider trades, congressional disclosures, and sector data to surface emerging market signals.

Signals

Where the market starts to move.

Detect emerging patterns, convergence, and divergence before they become obvious.

How it works

Three steps. From data to insight.

Find

Research stocks, investors, sectors, and politicians.
Track

Follow capital flows across sectors and filings.
Detect

Spot emerging alignment and divergence.

Fundamentals · Market context · Institutions · Insiders · Sectors · SEC filings

Open the research workspace.

Holdings from SEC 13F. Insider trades from Form 4. Congress from House and Senate PTRs. Real-time market prices via TradingView.

Browse by Strategy

Featured collections

S&P 500

Pick a collection or search to browse stocks.

Most Accumulated

Stocks ranked by net buying from institutional 13F, insider Form 4, and politician filings — not price performance.

Ownership Movers

Biggest quarter-over-quarter institutional ownership % movers from tracked 13F holders.

Holder Overlap

Stocks also owned by the institutional holders of a selected ticker — plus insider and politician buyers.

Holders also own

Rank	Stock	Overlap count	Overlap %	Weighted score	Conviction score

Institutions holding this stock

Institution	Type	Shares	Value	Weight

Insiders who bought

Insider	Title	Date	Value

Politicians who bought

Politician	Chamber	Date	Est. value

Ownership History

Historical ownership rankings from 13F filings — expansion, adoption, early discovery, and decliners.

Fastest ownership growth —

Biggest holder increase —

Biggest institutional declines —

New institutional discoveries —

—

Comparison summary

Institutional activity

Metric	Stock A	Stock B

Insider activity

Metric	Stock A	Stock B

Politician activity

Metric	Stock A	Stock B

Signals

Signal	Stock A	Stock B

Shared ownership

Activity timeline

Date	Stock A	Stock B

Screener

Filter the entire universe by insider, politician, institutional, and fundamental criteria.

Results

Choose filters and run the screener.

#	Ticker	Company	Sector	Revenue	FCF	Insider net	Inst. holders	Congress net
No results yet — add filters and run the screener.

CSGP

COSTAR GROUP, INC.

Institutional ownership

Institutional activity

Quarter-over-quarter changes

Biggest buyers

Top 5 by shares added vs prior quarter (existing positions)

Biggest sellers

Top 5 by shares sold vs prior quarter (still held)

Exits

Funds that filed this quarter and fully sold the stock (not merely late filers)

New positions

Funds that opened a brand-new position this quarter

Institutional options

13F call & put positions

Options bias

(calls − puts) ÷ (calls + puts)

Metric	Value
Loading…

Weighted bias

(common + 0.7×calls − 0.7×puts) ÷ total

Metric	Value
Loading…

Calls & puts by fund

Top 5 by total exposure · per-fund weighted bias (common + 0.7×calls − 0.7×puts) ÷ total

Fund	Contracts	Common	Calls	Puts	Bias

Insider activity

SEC Form 4 transactions

Insider	Role	Code	Call/Put	Signal	Shares	Price	Value	Date
Select a stock to load insider transactions.

Congress activity

Politician	Chamber	Type	Traded	Amount
Select a stock to load congressional trades.

SEC EDGAR filings

data.sec.gov submissions (recent)

Form	Filing date	Description	Accession

10-K filings

Form	Filing date	Report date	Description

8-K Item 2.02 earnings releases

Filing date	Items	Revenue	Net income	EPS (dil.)	Source

Fundamentals

SEC Company Facts · XBRL

Sector

SIC classification from SEC company submissions

—

Income statement

Latest values from 10-K (FY) or 10-Q (Q1–Q3)

—

Balance sheet

—

Cash flow

—

Derived metrics

Margins, free cash flow, and YoY growth

—

Annual periods (10-K)

FY	Period	Period end	Revenue	Op. income	Net income	EPS (dil.)	Assets	Rev YoY

Quarterly periods (10-Q)

FY	Period	Period end	Revenue	Op. income	Net income	EPS (dil.)	Assets	Rev YoY

13F-implied performance rankings

Portfolio returns from reconstructed 13F holdings

#	Institution	Type	Quarter	Return	Consistency	Ann. volatility

Performance

Ranked by change in reported 13F portfolio value

This ranking reflects changes in the reported value of an institution's disclosed 13F portfolio between filing periods. It is not the institution's actual investment return.

Rank	Institution					Latest Filing Date

Most Accumulated Stocks

Shows which stocks institutions have accumulated the most over the selected period.

Positive accumulation only

New Institutional Positions

Stocks that institutions opened as brand-new positions in their most recent 13F filing.

Total new positions —

Institutions reporting —

Unique stocks —

Total reported value —

			Filing quarter		Shares			Previous position

Completely Sold Positions

Stocks fully exited across tracked institutions, ranked by aggregated prior 13F value.

Stocks fully exited —

Institutions reporting exits —

Total exit events —

Total prior value exited —

						Status

Institution Comparison

Compare the latest reported holdings of two institutional investors.

Institution A

Filing quarter: — Filing date: —

Institution B

Filing quarter: — Filing date: —

Select two institutions to compare their latest 13F filings.

Institution A

Total portfolio value —

Holdings —

Largest holding —

Top sector —

Institution B

Total portfolio value —

Holdings —

Largest holding —

Top sector —

Shared holdings —

Unique to A —

Unique to B —

Portfolio similarity —

Weighted similarity —

Institution A — Top 25

Institution B — Top 25

Stock	Ticker	Position value	Portfolio weight	Shares	Filing quarter

Stock	Ticker	Position value	Portfolio weight	Shares	Filing quarter

Browse by Strategy

Institution Directory

Loading tracked institutions…

—

Institutional filer

Holdings

Top positions by reported value

Ticker	Stock

Activity

Quarter-over-quarter changes

Biggest adds

Existing positions with more shares; ranked by value of shares added (at quarter-end price)

Biggest trims

Existing positions with fewer shares (still held); ranked by value of shares reduced

Exits

Positions held last quarter that are fully sold (current shares = 0)

New positions

Positions not held in the prior quarter

All changes

Every position with a quarter-over-quarter share change

Options

13F call & put positions

Options bias

(calls − puts) ÷ (calls + puts)

Metric	Value
Loading…

Weighted bias

(common + 0.7×calls − 0.7×puts) ÷ total

Metric	Value
Loading…

Calls & puts by stock

Top 5 by total exposure · per-stock weighted bias (common + 0.7×calls − 0.7×puts) ÷ total

Performance

Reported 13F portfolio value changes

This reflects changes in the reported value of the institution's disclosed 13F portfolio between filing periods. It is not the institution's actual investment return.

Quarter	Portfolio value	QoQ $	QoQ %	Holdings	Filing date

Filings

13F filings on record

Quarter	Filing date	Form	Positions	Reported value

Insider clusters

Executive cluster buying — multiple insiders purchasing within a rolling window.

Loading…

#	Ticker	Score	Strength	Buyers	CEO	Buy value	Signal
Loading insider cluster signals…

Conviction Buys

Open-market Form 4 purchases ranked by conviction — size, ownership increase, role, and repeat buying.

Loading…

Highest conviction —

Avg conviction score —

High conviction buys —

Capital deployed —

#		Insider	Role					Label
Loading conviction buys…

Repeat Buyers

Insiders who repeatedly buy open-market shares of the same company — streaks, frequency, and capital deployed.

Loading…

Active repeat buyers —

Longest purchase streak —

Largest total investment —

Avg repeat score —

#		Insider	Role							Classification
Loading repeat buyers…

Most bullish stocks —

Most bearish stocks —

Net insider buying —

Avg sentiment score —

Stock sentiment rankings

Loading…

#		Buyers	Sellers				Classification
Loading insider sentiment…

First-ever buyers —

Avg years since last buy —

Highest conviction return —

Total capital invested —

First-time & long-gap purchases

Loading…

#		Insider	Role		Previous buy			Classification
Loading first-time buyers…

Heavy Selling

Stocks with significant open-market Form 4 selling — clusters, executives, and large sales.

Loading…

Largest insider sale —

Cluster selling events —

Executive sellers —

Total insider selling —

#				Shares sold				Classification
Loading heavy selling…

Recent insider trades

SEC Form 4 open-market and administrative insider transactions across ingested issuers.

Browse by Strategy

No insider trades in the database yet. Run npm run db:ingest-insider-form4 -- TICKER or bulk ingest to load Form 4 data.

Insider	Stock	Type	Date	Amount

Most Accumulated Stocks

Stocks with the largest net congressional buying over the selected period.

Largest Portfolios

Politicians ranked by net disclosed portfolio flow (purchases minus sales).

Repeat Buyers

Politicians repeatedly purchasing the same stock across congressional disclosures.

Active repeat buyers —

Longest purchase streak —

Largest estimated investment —

Average repeat buyer score —

#
Loading repeat buyers…

First-Time Buyers

First recorded purchases and returning buys after a multi-year gap — raw disclosure data, no scores.

First recorded buyers —

Returning buyers (3+ years) —

Avg years since previous buy —

Total estimated purchases —


Loading first-time buyers…

Heavy Selling

Stocks with significant sell disclosures from members of Congress — factual counts and estimated values only, no proprietary scores.

Largest estimated sale —

Stocks with multiple sellers —

Active politician sellers —

Total estimated value sold —


Loading…

Politician Sector Exposure

Explore which sectors members of Congress are investing in based on publicly disclosed trades.

Politicians trading this sector

Politician	Trades	Buys	Sells	Net

Most traded stocks

Stock	Trades	Est. value

Largest purchases

Politician	Stock	Amount	Date

Largest sales

Politician	Stock	Amount	Date

Recent disclosures

Politician	Stock	Type	Amount	Date

Politicians

Congressional stock trading disclosures, periodic transaction reports, and position history.

No filings loaded yet. Run npm run politicians:fetch-recent to pull the latest House and Senate PTRs.

Sector Accumulation

Institutional inflow by sector over the latest 13F quarter.

Industry Accumulation

Institutional inflow by industry over the latest 13F quarter.

Sectors

Loading…

Top stocks

Select a sector

Rank
Loading sector leaders…

Sectors

Loading…

Top exits

Select a sector

Rank
Loading sector selling…

Highest score —

Bullish (≥65) —

Tickers ranked —

Rankings

Loading…

#	Ticker	Score	Institutional	Insider	Congress	Alignment
Loading smart money scores…

Top institutions

Loading…

New positions

Select a fund

Ticker	Issuer
Loading new entries…

Total Double Signals —

Unique Stocks —

Institutions Involved —

Insider Purchases —

Double signals

Loading…


Loading double signals…

—

Institutional and insider buying activity within the selected window.

—

Institution activity

Institution	Type	Position value	Shares change	Filing date

Insider activity

Insider	Role	Purchase value	Shares	Date

Timeline

Total Triple Signals —

Unique Stocks —

Institutions Involved —

Insider Purchases —

Politicians Buying —

Triple signals

Loading…


Loading triple signals…

—

Institutional, insider, and politician buying activity within the selected window.

—

Institution activity

Institution	Type	Position value	Shares change	Filing date

Insider activity

Insider	Role	Purchase value	Shares	Date

Politician activity

Politician	Party	Chamber	Est. purchase	Date

Timeline

Conflicts —

Inst. buying / Insiders selling —

Inst. selling / Insiders buying —

Double conviction —

Conflict signals

Loading…


Select Conflict Signals to load.

Gems —

Hidden Gem —

Strong Accumulation —

Institutional Discovery —

Hidden gems

Loading…


Select Hidden Gems to load.

Highest Conviction —

Average Conviction —

High Conviction Stocks —

Exceptional Conviction —

Comparison

Score · median weight · >2% holders · accumulation

Ticker	Conviction	Median weight	>2% holders	Accumulation

Institutional conviction

Loading…

Rank
Loading conviction scores…

New Institutional Discoveries —

New Institutional Positions —

Fastest Holder Growth —

Longest Adoption Streak —

Institutional adoption

Loading…

Rank
Loading institutional discovery…

No stock selected

Financial inputs

Forecast assumptions

FCF growth by year

Scenario assumptions

Bear / Base / Bull cases use constant FCF growth with their own WACC and terminal growth. Not predictions.

Case	FCF growth %	WACC %	Terminal growth %
Bear Case
Base Case
Bull Case

DCF result

DCF implied value

—

per share

Current price: —
DCF implied upside: —
Enterprise value: —
Equity value: —
Terminal value %: —

Valuation bridge

Present value of forecast FCF

Year	FCF	Discount factor	Present value

Scenarios

DCF range —

Reverse DCF

What constant FCF growth is implied by the current price?

Current price: —
Implied FCF growth: —

Sensitivity

Intrinsic value per share — WACC × terminal growth

Financial data sources

WACC Calculator

Estimate weighted average cost of capital using filing-derived debt, tax rate, and market-based equity assumptions.

WACC (Weighted Average Cost of Capital) estimates the average return required by a company's shareholders and lenders. In a DCF, it is used as the discount rate for future cash flows.

No stock selected

Financial inputs

Cost of equity

What is this?

Cost of debt

Higher WACC → lower DCF valuation

Lower WACC → higher DCF valuation

No stock selected

Financial data

Normalized earnings

Historical margins

WACC

%

EPV uses WACC to capitalize normalized earnings. Higher WACC lowers EPV; lower WACC increases EPV.

Scenario assumptions

Bear / Base / Bull vary normalized margin and WACC only — no growth forecasts.

Case	Normalized margin %	WACC %
Bear Case
Base Case
Bull Case

EPV result

EPV per share

—

Enterprise EPV: —
Equity EPV: —
Current price: —
EPV implied upside: —

Valuation bridge

Scenarios

EPV range —

Sensitivity

EPV per share — WACC × normalized margin

Financial data sources

No stock selected

Financial inputs

Target P/E multiple

Scenario multiples

Case	P/E multiple
Bear Case
Base Case
Bull Case

Result

Implied Share Price

—

Current EPS: —
Selected P/E: —
Current Price: —
Implied Upside: —

Valuation bridge

Scenarios

Bear	Base	Bull

Data sources

No stock selected

Financial inputs

Target EV/EBITDA multiple

Scenario multiples

Case	EV/EBITDA
Bear Case
Base Case
Bull Case

Result

Implied Share Price

—

Implied Enterprise Value: —
Implied Equity Value: —
Current Price: —
Implied Upside: —

Net debt —

Valuation bridge

Scenarios

Bear	Base	Bull

Data sources

No stock selected

COSTAR GROUP, INC. (CSGP) 13F Holdings

Top institutional holders (2026-Q2)

Log in

Create your account

Check your email

Forgot password?

Choose a new password

Premium access

Getting Started

Data & Research

Watchlist & Accounts

Financial Information

Premium

Support

Still have questions?

1. Overview

2. Data Sources

Institutional activity

Insider activity

Political activity

Fundamentals & market context

3. Institutional Holdings

4. Insider Transactions

5. Political Activity

6. Normalization

7. Change Calculations

8. Filing Dates vs. Transaction Dates

9. Amendments & Corrections

10. Data Limitations

11. Updates

12. What InvestAtlant Doesn't Do

SEC

U.S. House of Representatives

TradingView

What we do

Our approach

1. What are cookies?

2. How InvestAtlant uses cookies

3. Analytics and advertising

4. Third-party services

5. Managing cookies

6. Changes to this Cookie Policy

7. Contact

1. Introduction

2. Who is responsible

3. Information we collect

Account information

Usage and technical information

Communications

Public market data

4. How we use information

5. Legal bases (EEA/UK users)

6. Cookies

7. Sharing and service providers

8. Retention

9. Security

10. Your rights

11. International transfers

12. Children

13. Changes

14. Contact

1. Agreement

2. The Service

3. Eligibility

4. Accounts

5. Acceptable use

6. Intellectual property

7. Third-party content and links

8. No financial advice

9. Disclaimers

10. Limitation of liability

11. Indemnity

12. Termination

13. Changes

14. Governing law

15. Contact

1. Informational purposes only

2. No client relationship

3. Data accuracy and completeness

4. No guarantee of results