Calvin Yu - Jul 2, 2021 Form 4 Insider Report for Alector, Inc. (ALEC)

Role: Vice President, Finance
Signature: /s/ David Oh, by power of attorney
Stock symbol: ALEC
Transactions as of: Jul 2, 2021
Transactions value $: -$2,902,224
Form type: 4
Date filed: 7/7/2021, 07:38 PM
Previous filing: Jun 3, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ALEC	Common Stock	Options Exercise	$150K	+18.4K	+14.54%	$8.16	145K	Jul 2, 2021	Direct
transaction	ALEC	Common Stock	Options Exercise	$114K	+11.3K	+7.75%	$10.14	156K	Jul 2, 2021	Direct
transaction	ALEC	Common Stock	Options Exercise	$535K	+31.2K	+19.94%	$17.15	188K	Jul 2, 2021	Direct
transaction	ALEC	Common Stock	Sale	-$2.83M	-90.8K	-48.44%	$31.14	96.7K	Jul 2, 2021	Direct	F1
transaction	ALEC	Common Stock	Sale	-$800K	-20K	-20.69%	$40.02^*	76.7K	Jul 2, 2021	Direct	F1, F2
transaction	ALEC	Common Stock	Options Exercise	$8.5K	+1.04K	+1.36%	$8.16	77.7K	Jul 6, 2021	Direct
transaction	ALEC	Common Stock	Options Exercise	$6.34K	+625	+0.8%	$10.14	78.4K	Jul 6, 2021	Direct
transaction	ALEC	Common Stock	Options Exercise	$28.6K	+1.67K	+2.13%	$17.15	80K	Jul 6, 2021	Direct
transaction	ALEC	Common Stock	Sale	-$116K	-3.33K	-4.17%	$34.65	76.7K	Jul 6, 2021	Direct	F1

Showing 1 to 9 of 9 entries

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	ALEC	Employee Stock Option (right to buy)	Options Exercise	$0	-18.4K	-56.61%	$0.00	14.1K	Jul 2, 2021	Common Stock	18.4K	$8.16	Direct	F3
transaction	ALEC	Employee Stock Option (right to buy)	Options Exercise	$0	-11.3K	-51.43%	$0.00	10.6K	Jul 2, 2021	Common Stock	11.3K	$10.14	Direct	F4
transaction	ALEC	Employee Stock Option (right to buy)	Options Exercise	$0	-31.2K	-38.96%	$0.00	48.8K	Jul 2, 2021	Common Stock	31.2K	$17.15	Direct	F5
transaction	ALEC	Employee Stock Option (right to buy)	Options Exercise	$0	-1.04K	-7.38%	$0.00	13.1K	Jul 6, 2021	Common Stock	1.04K	$8.16	Direct	F3
transaction	ALEC	Employee Stock Option (right to buy)	Options Exercise	$0	-625	-5.88%	$0.00	10K	Jul 6, 2021	Common Stock	625	$10.14	Direct	F4
transaction	ALEC	Employee Stock Option (right to buy)	Options Exercise	$0	-1.67K	-3.41%	$0.00	47.2K	Jul 6, 2021	Common Stock	1.67K	$17.15	Direct	F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The sales reported by the Reporting Person were effected pursuant to a Rule 10b5-1 trading plan adopted August 31, 2020.
F2	The sale price reported in column 4 of Table I represents the weighted average sale price of the shares purchased ranging from $40.00 to $40.32 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
F3	Shares subject to the option vest in 48 equal monthly installments beginning on August 2, 2018.
F4	One-fourth of the total number of shares subject to the option grant vested on November 1, 2019, and an additional 1/48th of the total number of shares vest monthly thereafter.
F5	Shares subject to the option vest in 48 equal monthly installments beginning on December 6, 2019.