Alector, Inc. — Director's Dealing 2019

Feb 11, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alector, Inc. (ALEC)
CIK: 0001653087
Period of Report: 2019-02-11

Reporting Person: GORDON CARL L (Director, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2019-02-11	Common Stock	C	405925	—	Acquired	405925	Indirect
2019-02-11	Common Stock	C	4282288	—	Acquired	4688213	Indirect
2019-02-11	Common Stock	C	2029626	—	Acquired	6717839	Indirect
2019-02-11	Common Stock	C	2280479	—	Acquired	8998318	Indirect
2019-02-11	Common Stock	C	1012282	—	Acquired	10010600	Indirect
2019-02-11	Common Stock	C	266437	—	Acquired	10277037	Indirect
2019-02-11	Common Stock	P	157939	$19.00	Acquired	10434976	Indirect
2019-02-11	Common Stock	C	94075	—	Acquired	94075	Indirect
2019-02-11	Common Stock	C	992437	—	Acquired	1086512	Indirect
2019-02-11	Common Stock	C	470374	—	Acquired	1556886	Indirect
2019-02-11	Common Stock	C	528510	—	Acquired	2085396	Indirect
2019-02-11	Common Stock	C	234601	—	Acquired	2319997	Indirect
2019-02-11	Common Stock	C	85295	—	Acquired	2405292	Indirect
2019-02-11	Common Stock	P	50561	$19.00	Acquired	2455853	Indirect
2019-02-11	Common Stock	P	203200	$19.00	Acquired	203200	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2019-02-11	Series A-1 Preferred Stock	$	C	405925	Disposed		Common Stock (405925)	Indirect
2019-02-11	Series A-1 Preferred Stock	$	C	94075	Disposed		Common Stock (94075)	Indirect
2019-02-11	Series A-2 Preferred Stock	$	C	4282288	Disposed		Common Stock (4282288)	Indirect
2019-02-11	Series A-2 Preferred Stock	$	C	992437	Disposed		Common Stock (992437)	Indirect
2019-02-11	Series B Preferred Stock	$	C	2029626	Disposed		Common Stock (2029626)	Indirect
2019-02-11	Series B Preferred Stock	$	C	470374	Disposed		Common Stock (470374)	Indirect
2019-02-11	Series C Preferred Stock	$	C	2280479	Disposed		Common Stock (2280479)	Indirect
2019-02-11	Series C Preferred Stock	$	C	528510	Disposed		Common Stock (528510)	Indirect
2019-02-11	Series D Preferred Stock	$	C	1012282	Disposed		Common Stock (1012282)	Indirect
2019-02-11	Series D Preferred Stock	$	C	234601	Disposed		Common Stock (234601)	Indirect
2019-02-11	Series E Preferred Stock	$	C	266437	Disposed		Common Stock (266437)	Indirect
2019-02-11	Series E Preferred Stock	$	C	85295	Disposed		Common Stock (85295)	Indirect

Footnotes

F1: Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into shares of Common Stock on a one to one basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and has no expiration date.

F2: The Shares are held of record by OrbiMed Private Investments IV-AL, LP ("OrbiMed IV-AL"). OrbiMed Capital GP IV LLC ("OrbiMed GP"), is the general partner of OrbiMed IV-AL. OrbiMed Advisors LLC ("OrbiMed Advisors"), a registered adviser under the Investment Advisers Act of 1940, as amended, is the managing member of OrbiMed GP. By virtue of such relationships, OrbiMed GP and OrbiMed Advisors may be deemed to have voting and investment power over the securities held by OrbiMed IV-AL and as a result may be deemed to have beneficial ownership over such securities. The Reporting Person is a member of OrbiMed Advisors.

F3: Each of OrbiMed GP, OrbiMed Capital LLC ("OrbiMed Capital"), OrbiMed Advisors and the Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of its or his pecuniary interest therein, if any. This report on Form 3 shall not be deemed an admission that any of the reporting persons is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.

F4: The Shares are held of record by OrbiMed Private Investments IV-AL (Feeder), LP ("OrbiMed IV-AL (Feeder)"). OrbiMed GP is the general partner of OrbiMed IV-AL (Feeder). OrbiMed Advisors, a registered adviser under the Investment Advisers Act of 1940, as amended, is the managing member of OrbiMed GP. By virtue of such relationships, OrbiMed GP and OrbiMed Advisors may be deemed to have voting and investment power over the securities held by OrbiMed IV-AL (Feeder) and as a result may be deemed to have beneficial ownership over such securities. The Reporting Person is a member of OrbiMed Advisors.

F5: The Shares are held of record by OrbiMed Partners Master Fund Limited ("OPM"). OrbiMed Capital, a registered investment adviser under the Investment Advisers Act, acts as the investment advisor to OPM. By virtue of such relationships, OrbiMed Capital may be deemed to have voting and investment power over the securities held by OPM and as a result may be deemed to have beneficial ownership over such securities.