Here are the S-3 shelf registrations from Alector, Inc. (ALEC) in our archive over the last 12 months, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
An S-3 covers the shelf registration that lets an established company sell over time, so if you follow ALEC and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full ALEC filings page.
Alector, Inc. has filed a shelf registration to offer up to $400,000,000 of securities, including common stock, preferred stock, debt securities, warrants, purchase contracts and units, under a prospectus dated March 12, 2026.
The prospectus is a shelf registration statement allowing multiple offerings from time to time and states that the registration includes $308,196,683.14 of unsold securities carried forward pursuant to Rule 415(a)(6) from the prior registration (File No. 333-270126). The offering will be made by prospectus supplements that set specific terms, methods of sale, and use of proceeds.