Ticker · CUSIP 45828L108

IAS

INTEGRAL AD SCIENCE HLDNG CO

Communication Services·Advertising Agencies

···Share

Holders (tracked)

Combined shares

2,610,279

Combined value

$26.55M

Last close

$10.34

Quarter

2025Q3

Price is +1.7% vs the avg quarter-end implied price across tracked holders.

Tracked holders · last 8 quarters

+1 vs previous quarter over the last 8.

SEC event timeline

14 events

T. Rowe Price exited2026-02-17
−39,935 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) exited2026-02-17
−333,892 shares · 2025Q4
Position
Ken Griffin (Citadel Advisors) exited2026-02-17
−24,900 shares · 2025Q4
Position
Two Sigma Investments exited2026-02-17
−59,664 shares · 2025Q4
Position
AQR Capital Management exited2026-02-17
−151,888 shares · 2025Q4
Position
George Soros (Soros Fund Mgmt) exited2026-02-13
−1,990,000 shares · 2025Q4
Position
Mario Gabelli (GAMCO) exited2026-02-05
−10,000 shares · 2025Q4
Position
AQR Capital Management added2025-11-14
+57,803 shares · 2025Q3
Position
Izzy Englander (Millennium Mgmt) opened position2025-11-14
+333,892 shares · 2025Q3
Position
Two Sigma Investments trimmed2025-11-14
−59,836 shares · 2025Q3
Position
T. Rowe Price added2025-11-14
+2,543 shares · 2025Q3
Position
George Soros (Soros Fund Mgmt) opened position2025-11-14
+1,990,000 shares · 2025Q3
Position
Renaissance Technologies exited2025-11-13
−232,300 shares · 2025Q3
Position
Mario Gabelli (GAMCO) opened position2025-11-12
+10,000 shares · 2025Q3
Position

Insider activity

No insider transactions in the last 30 days.

View full insider history for IAS →

Follow-the-investor returns

If you'd copied each holder of IAS…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
Ken Griffin (Citadel Advisors)	2021Q2	$8.27	+25.1%	$257K
Izzy Englander (Millennium Mgmt)	2021Q2	$8.96	+15.4%	$3.5M
AQR Capital Management	2023Q2	$9.73	+6.3%	$1.6M
George Soros (Soros Fund Mgmt)	2025Q3	$10.17	+1.7%	$20.6M
Mario Gabelli (GAMCO)	2025Q3	$10.17	+1.7%	$103K
T. Rowe Price	2021Q2	$12.39	-16.5%	$413K
Two Sigma Investments	2022Q1	$14.93	-30.8%	$617K

Who moved on this name in 2025Q3

Position changes reported for the latest quarter, grouped by direction.

New positions3

George Soros (Soros Fund Mgmt)
+1,990,000
$20.2M
Izzy Englander (Millennium Mgmt)
+333,892
$3.4M
Mario Gabelli (GAMCO)
+10,000
$102K

Added to2

AQR Capital Management
+57,803
$588K
T. Rowe Price
+2,543
$26

Trimmed1

Two Sigma Investments
−59,836
$609K

Exited1

Renaissance Technologies
−232,300
$1.9M

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2021Q4	5	1,525,511	$33.9M	—
2022Q1	7	6,819,591	$94.1M	+2
2022Q2	7	6,642,298	$66.0M	—
2022Q3	8	5,588,540	$40.5M	+1
2022Q4	9	5,071,268	$44.6M	+1
2023Q1	10	4,909,941	$70.1M	+1
2023Q2	13	7,204,623	$129.5M	+3
2023Q3	13	7,216,855	$85.8M	—
2023Q4	12	12,331,376	$177.4M	-1
2024Q1	11	8,163,726	$81.4M	-1
2024Q2	9	9,190,307	$89.3M	-2
2024Q3	7	1,546,548	$16.7M	-2
2024Q4	7	1,086,009	$11.3M	—
2025Q1	8	1,145,727	$9.2M	+1
2025Q2	6	559,494	$4.6M	-2
2025Q3	7	2,610,279	$26.5M	+1

Who owns IAS

7 super-investors · 2025Q3

Tracked stake

2.61M

Combined value

$27M

% of shares outstanding

—

shares-out unknown

Quarter action mix

New3Added2Trim1Held1

#	Manager	Shares	Value	% of book	Last action	8Q trend
1	George Soros Soros Fund Mgmt	1.99M	$20M	0.3%	New+1.99M	—
2	Izzy Englander Millennium Mgmt	333.9K	$3M	0.0%	New+333.9K
3	AQR Capital Management	151.9K	$2M	0.0%	Added+57.8K
4	Two Sigma Investments	59.7K	$607K	0.0%	Trim−59.8K
5	T. Rowe Price	39.9K	$407K	0.0%	Added+2.5K
6	Ken Griffin Citadel Advisors	24.9K	$253K	0.0%	Held
7	Mario Gabelli GAMCO	10.0K	$102K	0.0%	New+10.0K	—

Recent moves

20 transactions

SOLDT. Rowe Price
−39,935 · 2025Q4
SOLDKen Griffin (Citadel Advisors)
−24,900 · 2025Q4
SOLDTwo Sigma Investments
−59,664 · 2025Q4
SOLDIzzy Englander (Millennium Mgmt)
−333,892 · 2025Q4
SOLDAQR Capital Management
−151,888 · 2025Q4
SOLDGeorge Soros (Soros Fund Mgmt)
−1,990,000 · 2025Q4
SOLDMario Gabelli (GAMCO)
−10,000 · 2025Q4
NEWGeorge Soros (Soros Fund Mgmt)
+1,990,000 · 2025Q3
ADDT. Rowe Price
+2,543 · 2025Q3
NEWIzzy Englander (Millennium Mgmt)
+333,892 · 2025Q3
ADDAQR Capital Management
+57,803 · 2025Q3
TRIMTwo Sigma Investments
−59,836 · 2025Q3
SOLDRenaissance Technologies
−232,300 · 2025Q3
NEWMario Gabelli (GAMCO)
+10,000 · 2025Q3
SOLDIzzy Englander (Millennium Mgmt)
−406,770 · 2025Q2
SOLDSteve Cohen (Point72)
−76,155 · 2025Q2
NEWTwo Sigma Investments
+119,500 · 2025Q2
ADDT. Rowe Price
+5,362 · 2025Q2
ADDAQR Capital Management
+53,396 · 2025Q2
TRIMRenaissance Technologies
−207,700 · 2025Q2

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