Integral Ad Science Holding Corp.
Integral Ad Science Holding Corp. (IAS) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · IAS · as of Mar 31, 2025
Ownership Breakdown
188
Institutional Holders
▲ 23 vs Q4
$1.28B
Total Inst. Value
▼ $357.71M vs Q4
167.85M
Shares Outstanding
freeFloat 40.50%
159.01M
13F Shares Held
▲ 1.98M vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
IAS largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VISTA EQUITY PARTNERS MANAGEMENT, LLC services-computer programming, data processing, etc. | 65.01M | 39.73% | 39.73% | $523.98B | May 15, 2025 | — held |
ATLAS VENTURE ADVISORS, INC. services-computer programming, data processing, etc. | 22.72M | 13.89% | 13.89% | $183.15B | May 8, 2025 | — held |
VANGUARD GROUP INC services-computer programming, data processing, etc. | 9.09M | 5.55% | 5.55% | $73.27B | May 9, 2025 | ▲ 41.7K |
SUNRIVER MANAGEMENT LLC services-computer programming, data processing, etc. | 8.17M | 4.99% | 4.99% | $65.82B | May 14, 2025 | ▲ 875.7K |
BLACKROCK, INC. services-computer programming, data processing, etc. | 6.00M | 3.67% | 3.67% | $48.39B | May 2, 2025 | ▼ 35.4K |
P2 CAPITAL PARTNERS, LLC services-computer programming, data processing, etc. | 4.81M | 2.94% | 2.94% | $38.77B | May 15, 2025 | — held |
DIMENSIONAL FUND ADVISORS LP services-computer programming, data processing, etc. | 4.44M | 2.71% | 2.71% | $35.79B | May 13, 2025 | ▲ 649.8K |
RUBRIC CAPITAL MANAGEMENT LP services-computer programming, data processing, etc. | 3.17M | 1.94% | 1.94% | $25.53B | May 14, 2025 | ▲ 1.19M |
CORVEX MANAGEMENT LP services-computer programming, data processing, etc. | 2.62M | 1.60% | 1.60% | $21.10B | May 15, 2025 | NEW |
CLEARBRIDGE INVESTMENTS, LLC services-computer programming, data processing, etc. | 2.51M | 1.53% | 1.53% | $20.23B | May 13, 2025 | ▼ 218.9K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
25
Increased
+8.06M shares5
New Positions
first time holders16
Decreased
−2.75M shares0
Sold Out
fully exitedNet shares change (top 50)
+5.31M
+8.06M / −2.75M
Net new holders
+14
5 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
IAS insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
3
Buy transactions
19
Sell transactions
0.16
Buy/Sell ratio
$27M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
VEP Group, LLC 10 percent owner | Dec 23, 2025 | J-Other | 65,010,001 | $10.30 | $669.60M | 0 | Form 4 ↗ |
Atlas Venture Fund VIII, L.P. 10 percent owner | Dec 23, 2025 | J-Other | 22,722,770 | $10.30 | $234.04M | 0 | Form 4 ↗ |
Lord Robert director | Dec 23, 2025 | D-Return | 29,184 | $10.30 | $300.6K | 0 | Form 4 ↗ |
Wegner Alpana Chief Financial Officer | Dec 23, 2025 | D-Return | 525,279 | $10.30 | $5.41M | 0 | Form 4 ↗ |
PUTMAN JILL director | Dec 23, 2025 | D-Return | 132,355 | $10.30 | $1.36M | 0 | Form 4 ↗ |
Gil Alexis II Chief Accounting Officer | Dec 23, 2025 | D-Return | 136,840 | $10.30 | $1.41M | 0 | Form 4 ↗ |
Utzschneider Lisa Chief Executive Officer | Dec 23, 2025 | D-Return | 411,985 | $10.30 | $4.24M | 0 | Form 4 ↗ |
Utzschneider Lisa Chief Executive Officer | Dec 23, 2025 | D-Return | 2,051,991 | $6.17 | $12.66M | 0 | Form 4 ↗ |
BERKES OTTO director | Dec 23, 2025 | D-Return | 80,601 | $10.30 | $830.2K | 0 | Form 4 ↗ |
Heller Bridgette P director | Dec 23, 2025 | D-Return | 62,661 | $10.30 | $645.4K | 0 | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Integral Ad Science Holding Corp. (IAS) is primarily owned by institutional investors, who hold approximately 94.7% of total shares outstanding. Company insiders own approximately 59.50%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Integral Ad Science Holding Corp. is VISTA EQUITY PARTNERS MANAGEMENT, LLC, holding approximately 65.01 million shares — equal to 39.73% of outstanding shares — as of March 31, 2025.
A total of 188 institutional investors currently hold IAS stock, with a combined institutional value of approximately $1.28 billion as of the most recent 13F filing period.
Frequently asked questions
IAS ownershipIntegral Ad Science Holding Corp. (IAS) is primarily owned by institutional investors, who hold approximately 94.7% of shares. The largest shareholder is VISTA EQUITY PARTNERS MANAGEMENT, LLC with a 39.73% stake. Company insiders hold 59.50%. Data sourced from SEC Form 13F as of March 31, 2025.