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	$237,225,719	51.18%
2.	Vanguard Group Inc	9,048,546	$94,466,821	0%
3.	Blackrock, Inc.	6,039,473	$63,052,100	0%
4.	Dimensional Fund Advisors Lp	3,789,996	$39,567,032	0%
5.	Clearbridge Investments, Llc	2,729,420	$28,495,140	0.02%