Chimerix, Inc.
Chimerix, Inc. (CMRX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · CMRX · as of Mar 31, 2025
Ownership Breakdown
128
Institutional Holders
▲ 54 vs Q4
$618.43M
Total Inst. Value
▲ $459.93M vs Q4
93.80M
Shares Outstanding
freeFloat 85.75%
72.71M
13F Shares Held
▲ 27.15M vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
CMRX largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BERYL CAPITAL MANAGEMENT LLC pharmaceutical preparations | 3.93M | 4.38% | 4.38% | $33.42B | May 15, 2025 | NEW |
MAGNETAR FINANCIAL LLC pharmaceutical preparations | 3.92M | 4.37% | 4.37% | $33.34B | May 15, 2025 | NEW |
DEERFIELD MANAGEMENT COMPANY, L.P. (SERIES C) pharmaceutical preparations | 3.77M | 4.20% | 4.20% | $32.09B | May 15, 2025 | — held |
ALLIANCEBERNSTEIN L.P. pharmaceutical preparations | 3.70M | 4.10% | 4.10% | $31.50B | May 15, 2025 | NEW |
VANGUARD GROUP INC pharmaceutical preparations | 3.65M | 4.04% | 4.04% | $31.04B | May 9, 2025 | ▼ 397.2K |
KRYGER CAPITAL LTD pharmaceutical preparations | 3.50M | 3.90% | 3.90% | $29.81B | May 15, 2025 | NEW |
GLAZER CAPITAL, LLC pharmaceutical preparations | 3.35M | 3.72% | 3.72% | $28.55B | May 15, 2025 | NEW |
UBS GROUP AG pharmaceutical preparations | 2.90M | 3.21% | 3.21% | $24.69B | May 13, 2025 | ▲ 2.82M |
ALPINE ASSOCIATES MANAGEMENT INC. pharmaceutical preparations | 2.78M | 3.08% | 3.08% | $23.68B | May 8, 2025 | NEW |
FIRST TRUST CAPITAL MANAGEMENT L.P. pharmaceutical preparations | 2.41M | 2.67% | 2.67% | $20.53B | Jul 25, 2025 | NEW |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
10
Increased
+10.37M shares30
New Positions
first time holders9
Decreased
−1.97M shares0
Sold Out
fully exitedNet shares change (top 50)
+8.40M
+10.37M / −1.97M
Net new holders
+31
30 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
CMRX insider trading · insider activity
Source: SEC Form 4
0
Buy transactions
112
Sell transactions
0.00
Buy/Sell ratio
$16M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Vakiener Victoria director | Apr 21, 2025 | D-Return | 60,000 | $0.89 | $53.4K | 0 | Form 4 ↗ |
Vakiener Victoria director | Apr 21, 2025 | D-Return | 60,000 | $1.39 | $83.4K | 0 | Form 4 ↗ |
Vakiener Victoria director | Apr 21, 2025 | D-Return | 35,000 | $7.84 | $274.4K | 0 | Form 4 ↗ |
Vakiener Victoria director | Apr 21, 2025 | D-Return | 50,000 | $1.82 | $91.0K | 0 | Form 4 ↗ |
Vakiener Victoria director | Apr 21, 2025 | D-Return | 60,000 | $8.22 | $493.2K | 0 | Form 4 ↗ |
Sherman Michael A. Chief Executive Officer | Apr 21, 2025 | D-Return | 233,413 | $8.55 | $2.00M | 0 | Form 4 ↗ |
Sherman Michael A. Chief Executive Officer | Apr 21, 2025 | D-Return | 60,000 | $0.89 | $53.4K | 0 | Form 4 ↗ |
Sherman Michael A. Chief Executive Officer | Apr 21, 2025 | D-Return | 1,150,000 | $2.09 | $2.40M | 0 | Form 4 ↗ |
Sherman Michael A. Chief Executive Officer | Apr 21, 2025 | D-Return | 632,500 | $2.08 | $1.32M | 0 | Form 4 ↗ |
Sherman Michael A. Chief Executive Officer | Apr 21, 2025 | D-Return | 700,000 | $9.28 | $6.50M | 0 | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Chimerix, Inc. (CMRX) is primarily owned by institutional investors, who hold approximately 77.5% of total shares outstanding. Company insiders own approximately 14.25%, while retail and public investors account for the remaining 8.24%.
The largest institutional shareholder of Chimerix, Inc. is BERYL CAPITAL MANAGEMENT LLC, holding approximately 3.93 million shares — equal to 4.38% of outstanding shares — as of March 31, 2025.
A total of 128 institutional investors currently hold CMRX stock, with a combined institutional value of approximately $618,429,920 as of the most recent 13F filing period.
Frequently asked questions
CMRX ownershipChimerix, Inc. (CMRX) is primarily owned by institutional investors, who hold approximately 77.5% of shares. The largest shareholder is BERYL CAPITAL MANAGEMENT LLC with a 4.38% stake. Company insiders hold 14.25%. Data sourced from SEC Form 13F as of March 31, 2025.