Who owns Celldex Therapeutics (CLDX)
Which tracked institutional funds hold CLDX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See CLDX company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on CLDX is one-sided between 2026-Q1 and 2026-Q2: 109 added or opened and 25 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
CLDX’s largest tracked holder by dollar value, WELLINGTON MANAGEMENT GROUP LLP, sizes it at 0.1% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in CLDX divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 239 tracked filers holding CLDX, 151 increased or opened the position and 90 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in CLDX between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 17
- Driehaus Capital Management LLC$37M
- FEDERATED HERMES, INC.$18M
- TSP Capital Management Group, LLC$14M
- Trexquant Investment LP$7M
- MONTANOVA CAPITAL, LLC$5M
- Integral Health Asset Management, LLC$4M
Full exits 13
- Vestal Point Capital, LP$39M
- CITADEL ADVISORS LLC$6M
- SILVERARC CAPITAL MANAGEMENT, LLC$6M
- JANE STREET GROUP, LLC$3M
- HRT FINANCIAL LP$1M
- SG Americas Securities, LLC$1M
Largest adds
- PRICE T ROWE ASSOCIATES INC /MD/$108M
- BlackRock, Inc.$90M
- WELLINGTON MANAGEMENT GROUP LLP$84M
- Deep Track Capital, LP$69M
- Logos Global Management LP$64M
- STATE STREET CORP$56M
Largest trims
- Point72 Asset Management, L.P.$98M
- Commodore Capital LP$35M
- BRAIDWELL LP$27M
- BNP PARIBAS FINANCIAL MARKETS$4M
- Rosalind Advisors, Inc.$3M
- BALYASNY ASSET MANAGEMENT L.P.$2M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| WELLINGTON MANAGEMENT GROUP LLP added | 9,543,671 | $355M | 11.5% | 2026-Q2 |
| BlackRock, Inc. added | 7,002,530 | $261M | 8.4% | 2026-Q2 |
| Kynam Capital Management, LP trimmed | 5,322,908 | $198M | 6.4% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 4,685,223 | $174M | 5.6% | 2026-Q2 |
| STATE STREET CORP added | 3,900,427 | $145M | 4.7% | 2026-Q2 |
| FMR LLC trimmed | 3,722,888 | $139M | 4.5% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 3,464,831 | $129M | 4.2% | 2026-Q2 |
| Deep Track Capital, LP added | 2,939,151 | $109M | 3.5% | 2026-Q2 |
| Logos Global Management LP added | 2,100,000 | $78M | 2.5% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,022,226 | $75M | 2.4% | 2026-Q2 |
| Eversept Partners, LP trimmed | 1,785,941 | $66M | 2.1% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 1,615,343 | $60M | 1.9% | 2026-Q2 |
| Commodore Capital LP trimmed | 1,350,000 | $50M | 1.6% | 2026-Q2 |
| Bellevue Group AG | 1,200,000 | $45M | 1.4% | 2026-Q2 |
| BAKER BROS. ADVISORS LP added | 1,182,611 | $44M | 1.4% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 1,170,787 | $44M | 1.4% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 1,073,985 | $40M | 1.3% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 1,042,395 | $39M | 1.3% | 2026-Q2 |
| EVENTIDE ASSET MANAGEMENT, LLC | 1,037,000 | $39M | 1.2% | 2026-Q2 |
| NOVO HOLDINGS A/S trimmed | 1,025,000 | $38M | 1.2% | 2026-Q2 |
| Elmind Capital, LP added | 990,000 | $37M | 1.2% | 2026-Q2 |
| Driehaus Capital Management LLC new | 989,442 | $37M | 1.2% | 2026-Q2 |
| Fisher Asset Management, LLC trimmed | 985,677 | $37M | 1.2% | 2026-Q2 |
| Pictet Asset Management Holding SA trimmed | 917,408 | $34M | 1.1% | 2026-Q2 |
| Foresite Capital Management VI LLC added | 879,713 | $33M | 1.1% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 863,536 | $32M | 1.0% | 2026-Q2 |
| Assenagon Asset Management S.A. added | 788,696 | $29M | 0.9% | 2026-Q2 |
| NORTHERN TRUST CORP added | 719,647 | $27M | 0.9% | 2026-Q2 |
| Woodline Partners LP added | 700,830 | $26M | 0.8% | 2026-Q2 |
| Affinity Asset Advisors, LLC added | 700,000 | $26M | 0.8% | 2026-Q2 |
| Rock Springs Capital Management LP added | 699,146 | $26M | 0.8% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 661,235 | $25M | 0.8% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 655,954 | $24M | 0.8% | 2026-Q2 |
| ALGERT GLOBAL LLC added | 647,836 | $24M | 0.8% | 2026-Q2 |
| ADAR1 Capital Management, LLC added | 619,542 | $23M | 0.7% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 607,195 | $23M | 0.7% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC added | 572,538 | $21M | 0.7% | 2026-Q2 |
| Nuveen, LLC added | 568,460 | $21M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 552,973 | $21M | 0.7% | 2026-Q2 |
| 5AM Venture Management, LLC | 497,270 | $19M | 0.6% | 2026-Q2 |
| FEDERATED HERMES, INC. new | 492,893 | $18M | 0.6% | 2026-Q2 |
| UBS Group AG added | 481,997 | $18M | 0.6% | 2026-Q2 |
| Candriam S.C.A. added | 481,125 | $18M | 0.6% | 2026-Q2 |
| Ikarian Capital, LLC added | 478,500 | $18M | 0.6% | 2026-Q2 |
| BRAIDWELL LP trimmed | 436,646 | $16M | 0.5% | 2026-Q2 |
| Redmile Group, LLC added | 433,921 | $16M | 0.5% | 2026-Q2 |
| CITIGROUP INC added | 404,703 | $15M | 0.5% | 2026-Q2 |
| Palo Alto Investors LP added | 399,856 | $15M | 0.5% | 2026-Q2 |
| TSP Capital Management Group, LLC trimmed | 371,127 | $14M | 0.4% | 2026-Q2 |
| PFM Health Sciences, LP added | 342,751 | $13M | 0.4% | 2026-Q2 |
| KENNEDY CAPITAL MANAGEMENT LLC trimmed | 342,328 | $13M | 0.4% | 2026-Q2 |
| SEGALL BRYANT & HAMILL, LLC added | 336,291 | $13M | 0.4% | 2026-Q2 |
| Tetragon Partners GP Ltd trimmed | 290,441 | $11M | 0.3% | 2026-Q2 |
| SUPERSTRING CAPITAL MANAGEMENT LP added | 287,583 | $11M | 0.3% | 2026-Q2 |
| GordonMD Global Investments LP added | 279,720 | $10M | 0.3% | 2026-Q2 |
| SummitTX Capital, L.P. added | 254,959 | $9M | 0.3% | 2026-Q2 |
| SPHERA FUNDS MANAGEMENT LTD. trimmed | 240,868 | $9M | 0.3% | 2026-Q2 |
| Bank of New York Mellon Corp added | 224,176 | $8M | 0.3% | 2026-Q2 |
| Rosalind Advisors, Inc. trimmed | 200,000 | $7M | 0.2% | 2026-Q2 |
| MORGAN STANLEY trimmed | 196,974 | $7M | 0.2% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 195,788 | $7M | 0.2% | 2026-Q2 |
| Corient Private Wealth LP added | 186,110 | $7M | 0.2% | 2026-Q2 |
| Trexquant Investment LP added | 184,524 | $7M | 0.2% | 2026-Q2 |
| Mirador Capital Partners LP added | 181,054 | $7M | 0.2% | 2026-Q2 |
| STEMPOINT CAPITAL LP trimmed | 178,412 | $7M | 0.2% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 176,592 | $7M | 0.2% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 157,241 | $6M | 0.2% | 2026-Q2 |
| Cinctive Capital Management LP added | 145,637 | $5M | 0.2% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC added | 140,064 | $5M | 0.2% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 138,682 | $5M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 135,000 | $5M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 134,958 | $5M | 0.2% | 2026-Q2 |
| MONTANOVA CAPITAL, LLC new | 121,297 | $5M | 0.1% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 120,428 | $4M | 0.1% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 117,217 | $4M | 0.1% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. trimmed | 117,045 | $4M | 0.1% | 2026-Q2 |
| Jump Financial, LLC added | 116,293 | $4M | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 104,963 | $4M | 0.1% | 2026-Q2 |
| Propel Bio Management, LLC trimmed | 103,695 | $4M | 0.1% | 2026-Q2 |
| Invesco Ltd. added | 103,131 | $4M | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 100,452 | $4M | 0.1% | 2026-Q2 |
| Integral Health Asset Management, LLC new | 100,000 | $4M | 0.1% | 2026-Q2 |
| Odyssean, LLC new | 95,069 | $4M | 0.1% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 89,338 | $3M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 88,640 | $3M | 0.1% | 2026-Q2 |
| HighVista Strategies LLC trimmed | 86,964 | $3M | 0.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 86,893 | $3M | 0.1% | 2026-Q2 |
| Seven Fleet Capital Management LP added | 86,664 | $3M | 0.1% | 2026-Q2 |
| PDT Partners, LLC trimmed | 80,899 | $3M | 0.1% | 2026-Q2 |
| TD Asset Management Inc added | 79,326 | $3M | 0.1% | 2026-Q2 |
| ALPS ADVISORS INC added | 79,165 | $3M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 78,176 | $3M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 77,723 | $3M | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 75,135 | $3M | 0.1% | 2026-Q2 |
| Birchview Capital, LP trimmed | 69,900 | $3M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 69,048 | $3M | 0.1% | 2026-Q2 |
| DAFNA Capital Management LLC | 68,518 | $3M | 0.1% | 2026-Q2 |
| Man Group plc added | 63,504 | $2M | 0.1% | 2026-Q2 |
| Legal & General Group Plc added | 59,551 | $2M | 0.1% | 2026-Q2 |
| Rafferty Asset Management, LLC trimmed | 56,157 | $2M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.