Activist & passive stakes
Investors crossing the 5% ownership line, from SEC Schedule 13D (activist) and 13G (passive) filings. Newest first.
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All filings, new and amended.1–3 of 3
- ActivistAmendment 8Nov 6, 2026White Mountains Insurance Group, Ltd.24.3% · 12,356,223 shSEC
- ActivistNewBelow 5%Nov 2, 2026Liontrust Investment Partners LLP4.9% · 5,081,403 shSEC
- ActivistAmendment 7Oct 31, 2026White Mountains Insurance Group, Ltd.35.1% · 17,856,614 shSEC
| Filing | Symbol | Holder | % Owned | Shares | Filed | SEC filing |
|---|---|---|---|---|---|---|
ActivistAmendment 8 | MAX | White Mountains Insurance Group, Ltd. in MediaAlpha, Inc. | 24.3% | 12,356,223 | Nov 6, 2026 | SEC |
ActivistNewBelow 5% | MXCT | Liontrust Investment Partners LLP in Maxcyte, Inc. | 4.9% | 5,081,403 | Nov 2, 2026 | SEC |
ActivistAmendment 7 | MAX | White Mountains Insurance Group, Ltd. in MediaAlpha, Inc. | 35.1% | 17,856,614 | Oct 31, 2026 | SEC |