Activist & passive stakes
Investors crossing the 5% ownership line, from SEC Schedule 13D (activist) and 13G (passive) filings. Newest first.
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Amendments only.1–5 of 5
- PassiveAmendment 3Nov 6, 2026T. Rowe Price Investment Management, Inc.11.6% · 18,136,166 shSEC
- PassiveAmendment 1Nov 6, 2026Fmr Llc15% · 6,302,672 shSEC
- ActivistAmendment 8Nov 6, 2026White Mountains Insurance Group, Ltd.24.3% · 12,356,223 shSEC
- PassiveAmendment 3Nov 5, 2026Fmr Llc11.4% · 3,521,264 shSEC
- ActivistAmendment 7Oct 31, 2026White Mountains Insurance Group, Ltd.35.1% · 17,856,614 shSEC
| Filing | Symbol | Holder | % Owned | Shares | Filed | SEC filing |
|---|---|---|---|---|---|---|
PassiveAmendment 3 | PCVX | T. Rowe Price Investment Management, Inc. in Vaxcyte Inc | 11.6% | 18,136,166 | Nov 6, 2026 | SEC |
PassiveAmendment 1 | TRAX | Fmr Llc in First Tracks Biotherapeutics Inc | 15% | 6,302,672 | Nov 6, 2026 | SEC |
ActivistAmendment 8 | MAX | White Mountains Insurance Group, Ltd. in MediaAlpha, Inc. | 24.3% | 12,356,223 | Nov 6, 2026 | SEC |
PassiveAmendment 3 | ACLS | Fmr Llc in Axcelis Technologies Inc | 11.4% | 3,521,264 | Nov 5, 2026 | SEC |
ActivistAmendment 7 | MAX | White Mountains Insurance Group, Ltd. in MediaAlpha, Inc. | 35.1% | 17,856,614 | Oct 31, 2026 | SEC |