SCHEDULE: BlackRock Reports 4.7% Stake in Alector Inc.

BlackRock, Inc. has filed an amended Schedule 13G, disclosing a beneficial ownership of 4.7% of Alector, Inc.'s common stock as of December 31, 2025.

Summary

• BlackRock, Inc. reported beneficial ownership of 5,179,805 shares of Alector, Inc. common stock.
• This represents 4.7% of the total outstanding common stock of Alector, Inc.
• BlackRock holds sole voting power over 5,092,782 shares and sole dispositive power over 5,179,805 shares.
• The securities were acquired and are held in the ordinary course of business, not for the purpose of changing or influencing control of Alector, Inc.
• This filing is Amendment No. 6 to BlackRock's Schedule 13G for Alector, Inc.

Sentiment

Score: 5

Explanation: The filing is a factual disclosure of beneficial ownership. While the stake is below 5%, which could be interpreted neutrally to slightly negatively, it is a routine regulatory update without explicit positive or negative commentary on the issuer's performance.

Positives

• A major institutional investor, BlackRock, Inc., maintains a significant stake in Alector, Inc., indicating continued interest in the company.

Negatives

• BlackRock's beneficial ownership percentage has fallen below the 5% threshold, which typically triggers less frequent reporting requirements and may signal a reduction in their overall position.

Future Outlook

No forward-looking statements or guidance regarding Alector, Inc.'s future performance or strategy are provided in this beneficial ownership report.

Management Comments

• BlackRock, Inc. certifies that the securities were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of Alector, Inc.

Industry Context

This filing is a routine disclosure by a large asset manager, BlackRock, Inc., detailing its passive investment stake in Alector, Inc. Such disclosures are common for institutional investors who hold significant, but non-controlling, positions in publicly traded companies.

Stakeholder Impact

• Shareholders: Provides transparency regarding a significant institutional holder's stake, indicating BlackRock's continued, albeit reduced, investment in Alector, Inc.

Key Dates

Keywords

Alector Inc., BlackRock Inc., Schedule 13G, Beneficial Ownership, Common Stock, Institutional Investor, Equity Stake, ALEC