Integral Ad Science Holding Corp. (IAS)

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Institutional Investors' Holdings

Filing Period: Filing is Ongoing

No.	Name	Shares	Value	% Port
1.	Atlas Venture Advisors, Inc.	22,722,770	$183,145,526	50.04%
2.	Vanguard Group Inc	9,090,229	$73,267,246	0%
3.	Blackrock, Inc.	6,004,070	$48,392,806	0%
4.	Timessquare Capital Management, Llc	1,719,863	$13,862,096	0.22%
5.	Centerbook Partners Lp	651,880	$5,254,153	0.33%