Alector, Inc.

For the period ended Sep 30, 2026. Filed Nov 5, 2026.

About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Sep 30, 2026 · Filed Nov 5, 2026

ALEC$2.53+2.8%Stored close · as of Nov 10, 2026

Extracted filing text, with the paragraph anchors used by the comparison.

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Contents

Condensed Consolidated Statements of Stockholders’ Equity

Condensed Consolidated Statement of Stockholders’ Equity (Deficit)

(In thousands, except share data)

Common Stock · Additional Paid-In · Accumulated Other
	Shares	Amount	Capital	Comprehensive Income (Loss)	Accumulated Deficit	Total Stockholders’ Equity (Deficit)
Balance — December 31, 2025	110,362,581	$11	$1,002,528	$166	$(972,056)	$30,649
Vesting of restricted stock units	641,231	—	—	—	—	—
Exercise of stock options	21,375	—	25	—	—	25
Stock-based compensation	—	—	2,908	—	—	2,908
Unrealized loss on marketable securities	—	—	—	(270)	—	(270)
Net loss	—	—	—	—	(22,930)	(22,930)
Balance — March 31, 2026	111,025,187	11	$1,005,461	$(104)	$(994,986)	$10,382
Vesting of restricted stock units	583,920	—	—	—	—	—
Exercise of stock options	1,250	—	2	—	—	2
Purchase of common stock under employee stock purchase plan	46,448	—	48	—	—	48
Stock-based compensation	—	—	2,610	—	—	2,610
Unrealized loss on marketable securities	—	—	—	(22)	—	(22)
Net loss	—	—	—	—	(22,990)	(22,990)
Balance — June 30, 2026	111,656,805	$11	$1,008,121	$(126)	$(1,017,976)	$(9,970)
Vesting of restricted stock units	580,527	—	—	—	—	—
Exercise of stock options	37,563	—	49	—	—	49
Stock-based compensation	—	—	1,996	—	—	1,996
Unrealized loss on marketable securities	—	—	—	(106)	—	(106)
Net Income	—	—	—	—	124,600	124,600
Balance — September 30, 2026	112,274,895	$11	$1,010,166	$(232)	$(893,376)	$116,569

Condensed Consolidated Statement of Stockholders’ Equity

(In thousands, except share data)

Common Stock · Additional Paid-in · Accumulated Other
Shares · Amount · Capital · Comprehensive Income (Loss) · Accumulated Deficit · Total Stockholders’ Equity
Balance — December 31, 2024	99,085,888	$9	$955,657	$261	$(829,127)		$126,800
Vesting of restricted stock units	906,712	—	—	—	—		—
Stock-based compensation	—	—	8,351	—	—		8,351
Unrealized loss on marketable securities	—	—	—	(70)	—		(70)
Net loss	—	—	—	—	(40,471)		(40,471)
Balance — March 31, 2025	99,992,600	$9	$964,008	$191	$(869,598)		$94,610
Vesting of restricted stock units	1,111,421	—	—	—	—		—
Purchase of common stock under employee stock purchase plan	108,308	—	122	—	—		122
Stock-based compensation	—	—	7,062	—	—		7,062
Unrealized loss on marketable securities	—	—	—	(95)	—		(95)
Net loss	—	—	—	—	(30,524)		(30,524)
Balance — June 30, 2025	101,212,329	$9	$971,192	$96	$(900,122)		$71,175
Vesting of restricted stock units	818,565	—	—	—	—		—
Issuance of common stock, net of issuance costs of $300	5,415,162	1	14,700			14,701
Stock-based compensation	—	—	6,402	—	—		6,402
Unrealized gain on marketable securities	—	—	—	101	—		101
Net loss	—	—	—	—	(34,667)		(34,667)
Balance — September 30, 2025	107,446,056	$10	$992,294	$197	$(934,789)		$57,712

ContentsView on SEC.gov

The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.