Who owns Syndax Pharmaceuticals (SNDX)
Which tracked institutional funds hold SNDX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See SNDX 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
62 tracked funds added or opened SNDX while 75 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
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
SNDX’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes SNDX more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in SNDX 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 231 tracked filers holding SNDX, 127 increased or opened the position and 126 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
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 SNDX 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 16
- LOOMIS SAYLES & CO L P$20M
- FIRST TRUST ADVISORS LP$10M
- Jump Financial, LLC$9M
- JUPITER ASSET MANAGEMENT LTD$8M
- Jones Hill Capital LP$7M
- Alyeska Investment Group, L.P.$7M
Full exits 22
- Point72 Asset Management, L.P.$46M
- STEMPOINT CAPITAL LP$28M
- Integral Health Asset Management, LLC$8M
- JANE STREET GROUP, LLC$8M
- CANADA PENSION PLAN INVESTMENT BOARD$5M
- ESSEX INVESTMENT MANAGEMENT CO LLC$5M
Largest adds
- MILLENNIUM MANAGEMENT LLC$40M
- STATE STREET CORP$20M
- Candriam S.C.A.$15M
- UBS Group AG$14M
- GOLDMAN SACHS GROUP INC$11M
- ORBIMED ADVISORS LLC$11M
Largest trims
- Kynam Capital Management, LP$12M
- BANK OF AMERICA CORP /DE/$11M
- D. E. Shaw & Co., Inc.$10M
- Walleye Capital LLC$9M
- MORGAN STANLEY$8M
- Eversept Partners, LP$6M
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 |
|---|---|---|---|---|
| BlackRock, Inc. added | 9,020,006 | $197M | 8.6% | 2026-Q2 |
| Kynam Capital Management, LP | 8,050,959 | $176M | 7.7% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 5,861,265 | $128M | 5.6% | 2026-Q2 |
| STATE STREET CORP added | 5,658,424 | $124M | 5.4% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 4,045,094 | $88M | 3.9% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 3,927,892 | $86M | 3.7% | 2026-Q2 |
| DEERFIELD MANAGEMENT COMPANY, L.P. | 3,779,900 | $83M | 3.6% | 2026-Q2 |
| Eversept Partners, LP trimmed | 2,798,210 | $61M | 2.7% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,584,136 | $56M | 2.5% | 2026-Q2 |
| Hood River Capital Management LLC added | 2,564,279 | $56M | 2.4% | 2026-Q2 |
| KINGDON CAPITAL MANAGEMENT, L.L.C. | 2,500,000 | $55M | 2.4% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 2,286,499 | $50M | 2.2% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 2,053,960 | $45M | 2.0% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 1,921,796 | $42M | 1.8% | 2026-Q2 |
| UBS Group AG added | 1,893,750 | $41M | 1.8% | 2026-Q2 |
| Elmind Capital, LP | 1,855,000 | $41M | 1.8% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 1,790,173 | $39M | 1.7% | 2026-Q2 |
| Candriam S.C.A. added | 1,696,040 | $37M | 1.6% | 2026-Q2 |
| Soleus Capital Management, L.P. trimmed | 1,628,039 | $36M | 1.5% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 1,578,125 | $34M | 1.5% | 2026-Q2 |
| ORBIMED ADVISORS LLC added | 1,542,000 | $34M | 1.5% | 2026-Q2 |
| Nuveen, LLC trimmed | 1,364,575 | $30M | 1.3% | 2026-Q2 |
| MPM BIOIMPACT LLC trimmed | 1,333,523 | $29M | 1.3% | 2026-Q2 |
| Aisling Capital Management LP | 1,316,806 | $29M | 1.3% | 2026-Q2 |
| Woodline Partners LP | 1,250,760 | $27M | 1.2% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 1,239,954 | $27M | 1.2% | 2026-Q2 |
| Catalio Capital Management, LP added | 1,215,698 | $27M | 1.2% | 2026-Q2 |
| SILVERARC CAPITAL MANAGEMENT, LLC added | 1,214,390 | $27M | 1.2% | 2026-Q2 |
| Prosight Management, LP added | 1,200,000 | $26M | 1.1% | 2026-Q2 |
| Trails Edge Capital Partners, LP added | 1,110,000 | $24M | 1.1% | 2026-Q2 |
| ALGERT GLOBAL LLC added | 1,051,465 | $23M | 1.0% | 2026-Q2 |
| Bank of New York Mellon Corp added | 1,040,079 | $23M | 1.0% | 2026-Q2 |
| SPHERA FUNDS MANAGEMENT LTD. added | 1,014,606 | $22M | 1.0% | 2026-Q2 |
| LOOMIS SAYLES & CO L P new | 923,624 | $20M | 0.9% | 2026-Q2 |
| Parkman Healthcare Partners LLC trimmed | 877,256 | $19M | 0.8% | 2026-Q2 |
| Ensign Peak Advisors, Inc trimmed | 867,831 | $19M | 0.8% | 2026-Q2 |
| Palo Alto Investors LP | 864,986 | $19M | 0.8% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 853,304 | $19M | 0.8% | 2026-Q2 |
| NORTHERN TRUST CORP added | 845,537 | $18M | 0.8% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 814,303 | $18M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 633,509 | $14M | 0.6% | 2026-Q2 |
| MORGAN STANLEY trimmed | 588,979 | $13M | 0.6% | 2026-Q2 |
| Rhenman & Partners Asset Management AB added | 560,250 | $12M | 0.5% | 2026-Q2 |
| Apis Capital Advisors, LLC added | 556,000 | $12M | 0.5% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC added | 546,517 | $12M | 0.5% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 477,182 | $10M | 0.5% | 2026-Q2 |
| FIRST TRUST ADVISORS LP new | 456,700 | $10M | 0.4% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 454,101 | $10M | 0.4% | 2026-Q2 |
| Granahan Investment Management, LLC added | 446,988 | $10M | 0.4% | 2026-Q2 |
| Knott David M Jr added | 437,245 | $10M | 0.4% | 2026-Q2 |
| Jump Financial, LLC added | 402,846 | $9M | 0.4% | 2026-Q2 |
| Aberdeen Group plc added | 372,766 | $8M | 0.4% | 2026-Q2 |
| Squarepoint Ops LLC added | 370,317 | $8M | 0.4% | 2026-Q2 |
| JUPITER ASSET MANAGEMENT LTD new | 366,568 | $8M | 0.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 346,852 | $8M | 0.3% | 2026-Q2 |
| Hennion & Walsh Asset Management, Inc. added | 342,883 | $7M | 0.3% | 2026-Q2 |
| Jones Hill Capital LP new | 340,000 | $7M | 0.3% | 2026-Q2 |
| DAFNA Capital Management LLC added | 335,255 | $7M | 0.3% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC added | 327,617 | $7M | 0.3% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 321,600 | $7M | 0.3% | 2026-Q2 |
| Brevan Howard Capital Management LP added | 309,065 | $7M | 0.3% | 2026-Q2 |
| Alyeska Investment Group, L.P. new | 308,507 | $7M | 0.3% | 2026-Q2 |
| Verition Fund Management LLC added | 304,939 | $7M | 0.3% | 2026-Q2 |
| MACKENZIE FINANCIAL CORP new | 280,079 | $6M | 0.3% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 258,278 | $6M | 0.2% | 2026-Q2 |
| Trexquant Investment LP added | 255,949 | $6M | 0.2% | 2026-Q2 |
| SECTOR GAMMA AS trimmed | 241,739 | $5M | 0.2% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC trimmed | 236,717 | $5M | 0.2% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 231,446 | $5M | 0.2% | 2026-Q2 |
| Pinnacle Financial Partners, Inc. added | 217,173 | $5M | 0.2% | 2026-Q2 |
| Man Group plc added | 213,703 | $5M | 0.2% | 2026-Q2 |
| Y-Intercept (Hong Kong) Ltd added | 212,713 | $5M | 0.2% | 2026-Q2 |
| Pictet Asset Management Holding SA added | 207,936 | $5M | 0.2% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND trimmed | 207,250 | $5M | 0.2% | 2026-Q2 |
| Vienna Powszechne Towarzystwo Emerytalne S.A. Vienna Insurance Group | 200,000 | $4M | 0.2% | 2026-Q2 |
| CITIGROUP INC added | 195,703 | $4M | 0.2% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 193,134 | $4M | 0.2% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 180,000 | $4M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 168,100 | $4M | 0.2% | 2026-Q2 |
| Atom Investors LP added | 162,524 | $4M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 161,323 | $4M | 0.2% | 2026-Q2 |
| SummitTX Capital, L.P. added | 140,797 | $3M | 0.1% | 2026-Q2 |
| Invesco Ltd. trimmed | 138,060 | $3M | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 135,012 | $3M | 0.1% | 2026-Q2 |
| Torray Investment Partners LLC added | 133,835 | $3M | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 132,358 | $3M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 130,054 | $3M | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 128,199 | $3M | 0.1% | 2026-Q2 |
| Pale Fire Capital SE trimmed | 125,550 | $3M | 0.1% | 2026-Q2 |
| CAPITAL FUND MANAGEMENT S.A. trimmed | 125,091 | $3M | 0.1% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 124,241 | $3M | 0.1% | 2026-Q2 |
| PFM Health Sciences, LP trimmed | 118,422 | $3M | 0.1% | 2026-Q2 |
| SCHRODER INVESTMENT MANAGEMENT GROUP trimmed | 115,208 | $3M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 106,040 | $2M | 0.1% | 2026-Q2 |
| Rafferty Asset Management, LLC trimmed | 97,787 | $2M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 95,315 | $2M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 93,481 | $2M | 0.1% | 2026-Q2 |
| HUSSMAN STRATEGIC ADVISORS, INC. new | 84,000 | $2M | 0.1% | 2026-Q2 |
| Aquatic Capital Management LLC added | 78,922 | $2M | 0.1% | 2026-Q2 |
| WINTON GROUP Ltd added | 76,500 | $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.