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	$188,826,219	44.51%
2.	Vanguard Group Inc	9,255,897	$76,916,503	0%
3.	Geode Capital Management, Llc	1,915,385	$15,917,403	0%
4.	Standard Life Aberdeen Plc	1,764,731	$14,664,915	0.02%
5.	Rice Hall James & Associates, Llc	293,156	$2,436,126	0.13%