6Previous rank not shown
Red Robin Gourmet Burgers Inc
RRGBUpdateStake update- Shares
- —
- Value
- —
- Date invested
- Oct 23, 2026
Updated every two weeks: 1st & 15th · 7:00 a.m. ET
The Activist Investor Insider
Your Source for the Latest Activist Investor Stock Purchases
Every two weeks we rank the ten activist investors who disclosed the most buying in SEC filings, and show exactly where the money went: company, ticker, shares, value and date, each linked to its filing.
Subscriptions open soon.
Until then, email activistinvestorinsider@gmail.com and we'll add you by hand.
Latest edition: November 1, 2026 · Next: November 15, 2026
- Activists tracked
- 24
- Active this edition
- 7
- New 13D campaigns
- 3
- Top-5 buying (premium)
- ~$17M
Edition of November 1, 2026
The Top 10 activist investors
Ranked by disclosed buying in SEC filings dated 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.
Ranks 1–5 · November 1, 2026
Premium Subscribers
- Top-5 buying
- ~$17M
Top-5 total rounded to the nearest $1M.
Unlock the top 5 for $20/monthOr read them free when this edition unlocks on December 1, 2026.
7Previous rank not shown
The Wendy's Company
WENUpdateStake updateTake-private proposal- Shares
- —
- Value
- —
- Date invested
- Oct 28, 2026
Ranks 8–10 appear when this edition unlocks on December 1, 2026.
How to read values: plain figures are Form 4 transaction prices; est. = shares × the market close on the 13D event date; 13F = the fund's own quarterly 13F valuation, dated to the quarter. “Context” rows are shown but not counted, so the same purchase is never ranked twice. A dash means the filing gives no figure to show. Every row links to its filing on SEC EDGAR. Full methodology.
Inside the newsletter
What lands in your inbox on the 1st and 15th
The same Top 10 as the site, in one short email at 7:00 a.m. ET. This is the latest edition as free readers get it.
- Ranks 6–10 of the new Top 10, free: who bought, what, how much and when. In a quiet window, the lower ranks unlock with the rest of the edition.
- The size of the premium top five, and the date it unlocks for everyone
- A link to the SEC filing behind every number
Subscriptions open soon.
Until then, email activistinvestorinsider@gmail.com and we'll add you by hand.
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
How it works
Three SEC filings, read so you don't have to
Activist investors must tell the SEC when they buy big. We read those filings for the activists we track and turn them into one ranked table.
Schedule 13D
Within 5 business days of crossing 5%
Anyone who buys more than 5% of a public company and may try to influence it must file a 13D, including why they bought. Amendments (13D/A) report every material change in the stake. This is where activist campaigns begin.
Form 4
Within 2 business days of a trade
Once an investor owns more than 10% of a company or sits on its board, every purchase and sale is reported on Form 4 with the exact share count and price. These are the most precise numbers we publish.
Form 13F
Within 45 days of each quarter end
Every investment manager with $100 million or more in U.S.-listed stocks discloses its long holdings each quarter. Comparing one 13F with the last shows new positions, additions, trims and exits.
We read every filing for the activists we track, turn each one into a dated move with shares and value, and rank investors by how much they disclosed buying in the two-week window. Read the methodology →
Crowded trades
Stocks several activists own
- 6 activists$3.72B
Amazon Com Inc (AMZN)
From the latest 13F filings
- 6 activists$2.7B
Meta Platforms Inc (META)
From the latest 13F filings
- 4 activists$488M
Sotera Health Co (SHC)
From the latest 13F filings
- 3 activists$2.46B
Microsoft Corp (MSFT)
From the latest 13F filings
- 3 activists$1.93B
Visa Inc (V)
From the latest 13F filings
Track record
How the disclosed buys have done
- Average return
- −4.9%
- S&P 500 (SPY), same dates
- −4.8%
- Hit rate
- 39%
- Buys tracked
- 91
Each buy is measured from the close on the day its filing became public, the first day a reader could act. Hit rate is the share of tracked buys trading above their entry price. Past performance is not indicative of future results.
Premium Subscribers
See the whole Top 10 the morning it publishes.
Free readers get ranks 6–10. In a quiet window, the lower ranks unlock with the rest of the edition. Premium readers get ranks 1–5 as well: the activists who disclosed the most buying, what they bought, and the filings behind it.
$20/ month
- All 10 ranks, including the top 5, the morning each edition publishes
- Highlights: the biggest buys and crowded trades across the full Top 10
- Holdings snapshots from each ranked investor's latest 13F, in your inbox
The archive
Recent editions
Every edition becomes free in full 30 days after it publishes.
- November 1, 2026Filings dated October 15–31, 2026Top 5 premium
- October 15, 2026Filings dated October 1–14, 2026Top 5 premium
- October 1, 2026Filings dated September 15–30, 2026All 10 free
- September 15, 2026Filings dated September 1–14, 2026All 10 free
- September 1, 2026Filings dated August 15–31, 2026All 10 free