INTEGRAL AD SCIENCE HOLDING CORP. - Common Stock, $0.001 par value per share (IAS) Institutional Ownership

13F Institutional Holders and Ownership History from Q2 2021 to Q4 2025

Type / Class
Equity / Common Stock, $0.001 par value per share
Symbol
IAS
Shares outstanding
167,753,671
Price per share
$10.17
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
162,237,347
Total reported value
$1,649,954,203
% of total 13F portfolios
0.01%
Share change
+1,035,710
Value change
+$38,461,272
Number of holders
168
Price from insider filings
$10.17
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of INTEGRAL AD SCIENCE HOLDING CORP. - Common Stock, $0.001 par value per share (IAS) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
GLAZER CAPITAL, LLC 6.3% $108,776,848 10,602,032 Glazer Capital, LLC 02 Dec 2025
Sunriver Management LLC 4.3% -20% $72,411,997 -$17,317,039 7,120,157 -19% SUNRIVER MANAGEMENT LLC 30 Sep 2025

As of 30 Sep 2025, 168 institutional investors reported holding 162,237,347 shares of INTEGRAL AD SCIENCE HOLDING CORP. - Common Stock, $0.001 par value per share (IAS). This represents 97% of the company’s total 167,753,671 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of INTEGRAL AD SCIENCE HOLDING CORP. - Common Stock, $0.001 par value per share (IAS) together control 89% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
VISTA EQUITY PARTNERS MANAGEMENT, LLC 39% 65,010,001 0% 56% $661,151,710
Atlas Venture Advisors, Inc. 14% 22,722,770 0% 53% $231,090,571
VANGUARD GROUP INC 5.4% 9,043,380 -2.3% 0% $91,971,174
Sunriver Management LLC 4.2% 7,120,157 -19% 7.9% $72,411,997
BlackRock, Inc. 4% 6,757,261 +1.3% 0% $68,721,343
DIMENSIONAL FUND ADVISORS LP 3.5% 5,949,164 +10% 0.01% $60,502,884
P2 Capital Partners, LLC 2.9% 4,830,805 -1.6% 10% $49,129,287
KRYGER CAPITAL Ltd 1.8% 3,000,000 3.5% $30,510,000
NEXPOINT ASSET MANAGEMENT, L.P. 1.6% 2,683,061 2.4% $27,286,730
GLAZER CAPITAL, LLC 1.2% 2,096,797 0.72% $21,324,000
First Trust Capital Management L.P. 1.2% 2,088,796 1.4% $21,243,055
SOROS FUND MANAGEMENT LLC 1.2% 1,990,000 0.32% $20,238,300
GEODE CAPITAL MANAGEMENT, LLC 1.2% 1,964,293 +2.6% 0% $19,978,113
Verition Fund Management LLC 1.2% 1,948,970 +1663% 0.11% $19,821,025
STATE STREET CORP 0.98% 1,643,118 +2.1% 0% $16,710,510
BANK OF AMERICA CORP /DE/ 0.83% 1,394,507 +118% 0% $14,182,135
Nuveen, LLC 0.82% 1,369,706 -26% 0% $13,929,910
Balyasny Asset Management L.P. 0.7% 1,166,530 0.02% $11,863,610
WATER ISLAND CAPITAL LLC 0.64% 1,071,160 1.6% $10,893,698
Polar Asset Management Partners Inc. 0.6% 1,000,000 0.21% $10,170,000
AQR Arbitrage LLC 0.59% 991,705 0.26% $10,085,640
NORTHERN TRUST CORP 0.48% 805,536 -0.72% 0% $8,192,300
Dana Investment Advisors, Inc. 0.47% 793,740 +611% 0.24% $8,072,336
GOLDMAN SACHS GROUP INC 0.46% 767,555 +140% 0% $7,806,034
Ararat Capital Management LP 0.4% 668,407 -69% 3.6% $6,797,699

Institutional Holders of INTEGRAL AD SCIENCE HOLDING CORP. - Common Stock, $0.001 par value per share (IAS) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 330 $3,412 -$413,771,941 $10.17 2
2025 Q3 162,237,347 $1,649,954,203 +$38,461,272 $10.17 168
2025 Q2 161,302,415 $1,340,413,879 +$21,177,283 $8.31 167
2025 Q1 158,913,957 $1,280,907,870 +$6,183,963 $8.06 183
2024 Q4 157,013,768 $1,639,233,773 +$10,942,383 $10.44 162
2024 Q3 155,253,832 $1,678,301,051 -$7,490,949 $10.81 168
2024 Q2 156,540,646 $1,521,575,056 +$48,941,489 $9.72 153
2024 Q1 151,179,932 $1,507,267,904 -$34,001,193 $9.97 164
2023 Q4 152,051,602 $2,188,098,209 +$24,773,185 $14.39 173
2023 Q3 150,627,018 $1,790,970,912 -$13,700,552 $11.89 163
2023 Q2 150,627,248 $2,708,276,328 +$18,710,371 $17.98 167
2023 Q1 149,864,180 $2,138,488,934 +$29,872,291 $14.27 114
2022 Q4 148,104,635 $1,301,853,690 -$3,576,426 $8.79 105
2022 Q3 148,973,800 $1,079,153,266 -$28,475,728 $7.24 96
2022 Q2 149,824,703 $1,487,805,317 +$6,990,414 $9.93 87
2022 Q1 148,720,656 $2,053,137,371 -$74,182,167 $13.80 87
2021 Q4 153,375,601 $3,406,359,912 +$45,043,910 $22.21 78
2021 Q3 145,093,409 $2,993,365,044 +$23,018,213 $20.63 69
2021 Q2 143,921,089 $2,961,335,000 +$2,961,335,000 $20.58 70