Integral Ad Science Holding Corp. (IAS)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Atlas Venture Advisors, Inc.	22,722,770	$188,826,219	44.51%
2.	Vanguard Group Inc	9,255,897	$76,916,503	0%
3.	Blackrock, Inc.	6,667,605	$55,407,797	0%
4.	Dimensional Fund Advisors Lp	5,406,393	$44,924,028	0.01%
5.	Clearbridge Investments, Llc	2,325,232	$19,322,677	0.02%