Comparable stake leader
Sunriver Management LLC
SEC ownership of INTEGRAL AD SCIENCE HOLDING CORP.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001842718.
Disclosed value leader
Sunriver Management LLC
Comparable rows
2/7
Latest evidence
31 Dec 2025
- Parsed ownership sources
-
13D/G and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Sunriver Management LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
2 of 7
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Sunriver Management LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Dec 2025
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001842718
- Issuer location
- New York, NY
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of INTEGRAL AD SCIENCE HOLDING CORP. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Sunriver Management LLC
Disclosed value leader
Sunriver Management LLC
Comparable rows
2/7
Latest evidence
31 Dec 2025
13D/G
3/4/5
Lead comparable stake: 4.3%
5 rows are not safely comparable across share classes.
13D/G row: Sunriver Management LLC
Quick read
Sunriver Management LLC leads the comparable SEC ownership view at 4.3%.
2 of 7 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Sunriver Management LLC's linked filing trail.
Comparable ownership
Top 2
Sunriver Management LLC
4.3%
GLAZER CAPITAL, LLC
4.2%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-7 of 7 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Sunriver Management LLC |
13D/G
|
4.3%
Reported 13D/G
· 30 Sep 2025
|
$72,411,997
7,120,157 shares
|
-$17,317,039 | 30 Sep 2025 |
| GLAZER CAPITAL, LLC |
13D/G
|
4.2%
Reported 13D/G
· 31 Dec 2025
|
$71,006,577
6,981,827 shares
|
-$36,818,209 | 31 Dec 2025 |
| Tania Secor |
3/4/5
Chief Financial Officer
|
—
mixed-class rows
|
$2,520,424
501,846 shares
mixed-class rows
|
— | 03 Jan 2025 |
| Joseph Pergola |
3/4/5
Chief Financial Officer
|
—
denominator unverified
|
$1,937,982
225,872 shares
|
— | 29 Jun 2021 |
| Anil Sukumaran |
3/4/5
Chief Accounting Officer
|
—
denominator unverified
|
$1,257,480
89,820 shares
|
— | 03 May 2023 |
| Tom Sharma |
3/4/5
Former Chief Product Officer
|
—
mixed-class rows
|
$697,620
311,789 shares
mixed-class rows
|
— | 02 Aug 2023 |
| Oleg Bershadsky |
3/4/5
Former Chief Operating Officer
|
—
denominator unverified
|
$471,042
54,900 shares
|
— | 03 Apr 2023 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$28,589.
Buys
$0
Insiders: 0
Sells
$28,589
Insiders: 1
Net
-$28,589
Shares: -2,781
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 2,781
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 2,781 | $0 | $28,589 | -$28,589 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 20 reporting-owner rows connected to INTEGRAL AD SCIENCE HOLDING CORP.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
20
Largest Forms 3/4/5 holder
Tania Secor
Net 12M change
-$28.59K
Full value: -$28,589 · USD · 12-month changeLatest report
23 Dec 2025
Recent insider transactions for INTEGRAL AD SCIENCE HOLDING CORP.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| VEP Group, LLC | IAS | Common Stock, $0.001 par value | Other | -100% | -65,010,001 | 0 | 23 Dec 2025 | See Footnotes | ||
| Atlas Venture Fund VIII, L.P. | IAS | Common stock, $0.001 par value | Other | -100% | -22,722,770 | 0 | 23 Dec 2025 | See Footnote | ||
| Robert Lord | IAS | Common Stock, $0.001 par value | Disposed to Issuer | -100% | -29,184 | 0 | 23 Dec 2025 | Direct | ||
| Alpana Wegner | IAS | Common Stock, $0.001 par value | Disposed to Issuer | -100% | -525,279 | 0 | 23 Dec 2025 | Direct | ||
| Jill Putman | IAS | Common Stock, $0.001 par value | Disposed to Issuer | -100% | -132,355 | 0 | 23 Dec 2025 | Direct | ||
| Alexis Gil II | IAS | Common Stock, $0.001 par value | Disposed to Issuer | -100% | -136,840 | 0 | 23 Dec 2025 | Direct | ||
| Lisa Utzschneider | IAS | Common Stock, $0.001 par value | Disposed to Issuer | -100% | -411,985 | 0 | 23 Dec 2025 | Direct | ||
| Lisa Utzschneider | IAS | Options (Right to Buy) | Disposed to Issuer | -100% | -2,051,991 | 0 | 23 Dec 2025 | Direct | ||
| Lisa Utzschneider | IAS | Market Stock Units | Options Exercise | -100% | -1,555,701 | 0 | 23 Dec 2025 | Direct | ||
| Otto Berkes | IAS | Common Stock, $0.001 par value | Disposed to Issuer | -100% | -80,601 | 0 | 23 Dec 2025 | Direct | ||
| Bridgette P. Heller | IAS | Common Stock, $0.001 par value | Disposed to Issuer | -100% | -62,661 | 0 | 23 Dec 2025 | Direct | ||
| Alexis Gil II | IAS | Common Stock, $0.001 par value | Sale | -1.99% | -$28,589 | $10.28 | -2,781 | 136,840 | 02 Dec 2025 | Direct |
* marks a reported price that did not pass the local price check.