Alector, Inc. · Stock award · Employee Stock Option (right to buy)

What does this filing report?

An SEC Form 4 filing for Alector, Inc. records a stock award involving Employee Stock Option (right to buy) on October 13, 2026. The reported quantity was 520,000. The filing date is October 15, 2026. This is one transaction record; amounts are not allocated among any joint reporting owners.

The acquisition category describes how securities were received. It does not by itself establish a cash purchase of common stock. Read the transaction code definitionsand the original filing before interpreting the amounts.

Derivative terms

Underlying security

Common Stock

Underlying quantity

520,000

Conversion / exercise price

1.87

Exercise date

Not reported

Expiration date

November 5, 2029

Filing footnotes & remarks

F1

The reported shares are represented by restricted stock units, or RSUs, which vest in 12 equal quarterly installments beginning on December 1, 2026.

F2

The reported securities are held directly by The Rosenthal Family Revocable Trust Dated November 4, 1994, as restated on June 9, 1999, for which the Reporting Person serves as trustee.

F3

The reported securities are held directly by the Adi Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.

F4

The reported securities are held directly by the Noam Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.

F5

The reported securities are held directly by the Shani Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.

F6

The shares subject to the option are fully vested and immediately exercisable.

F7

The transactions reported herein reflect a one-time stock option repricing (the "Option Repricing") effective on October 13, 2026 (the "Effective Date"). The Option Repricing applies to stock options with exercise prices greater than $1.87 per share held by all continuing employees of the Issuer as of the Effective Date.

F8

Pursuant to the Option Repricing, the exercise price of the repriced options, including the reported option, has been amended to reduce the exercise price to $1.87 per share, the closing price of the Issuer's common stock on the Effective Date. However, if an employee exercises a repriced Eligible Option before the end of a "Retention Period" that begins on the Effective Date of the Option Repricing and ends on the earliest to occur of the following: (i) one year following the Effective Date; (ii) a Change in Control, as defined in the Issuer's 2019 Equity Incentive Plan, as amended (the "2019 Plan"); and (iii) the optionholder's death or Disability (as defined in the 2019 Plan), then the employee will be required to pay a premium exercise price that is equal to the original exercise price per share of such option. There was no change to the vesting schedules, expiration dates or number of shares underlying the repriced options.

F9

Shares subject to the option vest in 48 equal monthly installments beginning on November 1, 2023.

F10

Shares subject to the option vest in 48 equal monthly installments beginning on November 13, 2026.

Footnotes are reproduced as plain text from the current source filing. For the full context, read the original SEC filing.