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

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Contents

Condensed Consolidated Statements of Operations and Comprehensive Income (Loss)

(In thousands, except share and per share data)

	Three Months EndedSeptember 30,		Nine Months Ended September 30,
	2026	2025	2026	2025
Collaboration revenue	$162,866	$3,260	$167,232	$14,808
Operating expenses:
Research and development	30,034	29,350	67,351	90,602
General and administrative	8,991	11,518	25,352	40,647
Total operating expenses	39,025	40,868	92,703	131,249
Income (loss) from operations	123,841	(37,608)	74,529	(116,441)
Other income, net	819	2,941	4,341	10,779
Income (loss) before income taxes	124,660	(34,667)	78,870	(105,662)
Income tax expense	60	—	190	—
Net income (loss)	124,600	(34,667)	78,680	(105,662)
Unrealized (loss) gain on marketable securities	(106)	101	(398)	(64)
Comprehensive income (loss)	$124,494	$(34,566)	$78,282	$(105,726)
Net income (loss) per share:
Basic net income (loss) per share	$1.11	$(0.34)	$0.71	$(1.05)
Diluted net income (loss) per share	$1.11	$(0.34)	$0.70	$(1.05)
Weighted-average shares in calculating:
Basic net income (loss) per share	111,861,933	102,597,601	111,230,090	100,800,863
Diluted net income (loss) per share	112,477,348	102,597,601	111,968,475	100,800,863

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.