Alector Inc. (ALEC)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Tcg Crossover Management, Llc	10,000,000	$15,600,000	0.52%
2.	Blackrock, Inc.	7,147,766	$11,150,515	0%
3.	Vanguard Group Inc	6,908,054	$10,776,564	0%
4.	Foresite Capital Management Iv, Llc	3,887,200	$6,064,032	2.64%
5.	Merck & Co., Inc.	3,545,719	$5,531,322	2%