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Know what activist investors are buying.
When an activist fund buys a big stake in a public company, it has to tell the SEC. We read those filings and send you the Top 10 activist investors of the past two weeks, with exactly where they invested.
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Five of the ten most active activist investors of the period, with every disclosed move. In a quiet window, the lower ranks unlock with the rest of the edition.
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Schedule 13D, Form 4 and 13F filings, each number linked to its source.
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Inside the newsletter
Here's the latest edition
The November 1, 2026 edition as free readers get it. Every link works: click through to the full table and the filings.
The Activist Investor Insider
Edition of November 1, 2026 · Filings dated October 15–31, 2026
The Top 10 activist investors of October 15–31, 2026
7 of the 24 activists we track disclosed moves in SEC filings dated October 15–31, 2026, including 3 new 13D campaigns. Ranks 1–5 are for Premium Subscribers until December 1, 2026.
- Tracked
- 24
- Active
- 7
- New 13Ds
- 3
Premium Subscribers · Ranks 1–5
The five biggest buyers of the period: ~$17M of disclosed buying. Free for everyone on December 1, 2026.
Unlock ranks 1–5 · $20/monthRanks 6–7 · free
Ranks 8–10 appear when this edition unlocks on December 1, 2026.
— The Activist Investor Insider
Every number links to its SEC filing · All editions