SYNDAX PHARMACEUTICALS INC (SNDX) Institutional Shareholders
SYNDAX PHARMACEUTICALS INC (SNDX) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $2.31B in SNDX holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of SNDX tracked by InsiderSet, reporting ownership valued at approximately $197.18M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $159.47M, representing an estimated loss of -19.12% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 46% of the total disclosed SNDX value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Kynam Capital Management, Lp, Goldman Sachs Group Inc, and several other long-term asset managers with concentrated positions in SYNDAX PHARMACEUTICALS INC (SNDX).
This page ranks the largest institutional SNDX shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
236
Total Reported Value
$2.31B
Largest Holder
Blackrock, Inc.
Largest Position
$197.18M
Insider Transactions (90d)
1
Latest Filing Quarter
Q2 2026
New Institutional Positions
53
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 9,020,006 | $197,177,353 | $159,473,706 | -$37,703,647 | -19.12% | |
| Kynam Capital Management, Lp | 9.73% | 8,050,959 | $175,993,964 | $142,340,955 | -$33,653,009 | -19.12% | |
| Goldman Sachs Group Inc | 0.01% | 5,861,265 | $128,127,253 | $103,627,165 | -$24,500,088 | -19.12% | |
| State Street Corp | 0.00% | 5,658,424 | $123,693,149 | $100,040,936 | -$23,652,213 | -19.12% | |
| Bank Of America Corp | 0.01% | 4,045,094 | $88,425,755 | $71,517,262 | -$16,908,493 | -19.12% | |
| Vanguard Capital Management Llc | 0.00% | 3,927,892 | $85,863,719 | $69,445,131 | -$16,418,588 | -19.12% | |
| Deerfield Management Company, L.P. | 0.86% | 3,779,900 | $82,628,614 | $66,828,632 | -$15,799,982 | -19.12% | |
| Eversept Partners, Lp | 3.33% | 2,798,210 | $61,168,871 | $49,472,353 | -$11,696,518 | -19.12% | |
| Geode Capital Management, Llc | 0.00% | 2,584,136 | $56,499,563 | $45,687,524 | -$10,812,039 | -19.14% | |
| Hood River Capital Management Llc | 0.41% | 2,564,279 | $56,055,139 | $45,336,453 | -$10,718,686 | -19.12% | |
| Kingdon Capital Management, L.L.C. | 7.37% | 2,500,000 | $54,650,000 | $44,200,000 | -$10,450,000 | -19.12% | |
| Millennium Management Llc | 0.03% | 2,053,960 | $44,899,566 | $36,314,013 | -$8,585,553 | -19.12% | |
| Vanguard Portfolio Management Llc | 0.00% | 1,921,796 | $42,010,461 | $33,977,353 | -$8,033,108 | -19.12% | |
| Ubs Group Ag | 0.01% | 1,893,750 | $41,397,375 | $33,481,500 | -$7,915,875 | -19.12% | |
| Elmind Capital, Lp | 10.19% | 1,855,000 | $40,550,300 | $32,796,400 | -$7,753,900 | -19.12% | |
| Bnp Paribas Asset Management Holding S.A. | 0.04% | 1,790,173 | $39,133,182 | $31,650,259 | -$7,482,923 | -19.12% | |
| Candriam S.C.A. | 0.17% | 1,696,040 | $37,039,763 | $29,985,987 | -$7,053,776 | -19.04% | |
| Soleus Capital Management, L.P. | 1.23% | 1,628,039 | $35,588,933 | $28,783,730 | -$6,805,203 | -19.12% | |
| Two Sigma Investments, Lp | 0.03% | 1,578,125 | $34,497,812 | $27,901,250 | -$6,596,562 | -19.12% | |
| Orbimed Advisors Llc | 0.64% | 1,542,000 | $33,708,120 | $27,262,560 | -$6,445,560 | -19.12% | |
| Nuveen, Llc | 0.01% | 1,364,575 | $29,829,610 | $24,125,686 | -$5,703,924 | -19.12% | |
| Mpm Bioimpact Llc | 1.78% | 1,333,523 | $29,150,813 | $23,576,687 | -$5,574,126 | -19.12% | |
| Aisling Capital Management Lp | 6.10% | 1,316,806 | $28,785,379 | $23,281,130 | -$5,504,249 | -19.12% | |
| Woodline Partners Lp | 0.08% | 1,250,760 | $27,341,614 | $22,113,437 | -$5,228,177 | -19.12% | |
| D. E. Shaw & Co., Inc. | 0.02% | 1,239,954 | $27,105,395 | $21,922,387 | -$5,183,008 | -19.12% | |
| Silverarc Capital Management, Llc | 2.95% | 1,214,390 | $26,546,565 | $21,470,415 | -$5,076,150 | -19.12% | |
| Prosight Management, Lp | 4.52% | 1,200,000 | $26,232,000 | $21,216,000 | -$5,016,000 | -19.12% | |
| Catalio Capital Management, Lp | 4.44% | 1,196,807 | $25,144,915 | $21,159,548 | -$3,985,367 | -15.85% | |
| Trails Edge Capital Partners, Lp | 3.85% | 1,110,000 | $24,264,600 | $19,624,800 | -$4,639,800 | -19.12% | |
| Ensign Peak Advisors, Inc | 0.04% | 990,969 | $23,149,036 | $17,520,332 | -$5,628,704 | -24.32% | |
| Algert Global Llc | 0.27% | 1,051,465 | $22,985,025 | $18,589,901 | -$4,395,124 | -19.12% | |
| Bank Of New York Mellon Corp | 0.00% | 1,040,079 | $22,736,118 | $18,388,597 | -$4,347,521 | -19.12% | |
| Sphera Funds Management Ltd. | 3.17% | 1,014,606 | $22,179,287 | $17,938,234 | -$4,241,053 | -19.12% | |
| Loomis Sayles & Co L P | 0.03% | 923,624 | $20,190,420 | $16,329,672 | -$3,860,748 | -19.12% | |
| Parkman Healthcare Partners Llc | 1.97% | 877,256 | $19,176,816 | $15,509,886 | -$3,666,930 | -19.12% | |
| Palo Alto Investors Lp | 2.61% | 864,986 | $18,908,594 | $15,292,952 | -$3,615,642 | -19.12% | |
| Aqr Capital Management Llc | 0.01% | 853,304 | $18,653,226 | $15,086,415 | -$3,566,811 | -19.12% | |
| Northern Trust Corp | 0.00% | 845,537 | $18,483,439 | $14,949,094 | -$3,534,345 | -19.12% | |
| Charles Schwab Investment Management Inc | 0.00% | 814,303 | $17,800,664 | $14,396,877 | -$3,403,787 | -19.12% | |
| Vanguard Fiduciary Trust Co | 0.00% | 633,509 | $13,848,507 | $11,200,439 | -$2,648,068 | -19.12% | |
| Morgan Stanley | 0.00% | 588,979 | $12,875,080 | $10,413,149 | -$2,461,931 | -19.12% | |
| Rhenman & Partners Asset Management Ab | 1.16% | 560,250 | $12,247,065 | $9,905,220 | -$2,341,845 | -19.12% | |
| Apis Capital Advisors, Llc | 1.18% | 556,000 | $12,154,160 | $9,830,080 | -$2,324,080 | -19.12% | |
| Panagora Asset Management Inc | 0.04% | 546,517 | $11,946,862 | $9,662,421 | -$2,284,441 | -19.12% | |
| Qube Research & Technologies Ltd | 0.01% | 477,182 | $10,431,199 | $8,436,578 | -$1,994,621 | -19.12% | |
| First Trust Advisors Lp | 0.01% | 456,700 | $9,983,462 | $8,074,456 | -$1,909,006 | -19.12% | |
| Susquehanna International Group, Llp | 0.01% | 454,101 | $9,926,648 | $8,028,506 | -$1,898,142 | -19.12% | |
| Granahan Investment Management, Llc | 0.35% | 446,988 | $9,771,158 | $7,902,748 | -$1,868,410 | -19.12% | |
| Knott David M Jr | 5.05% | 437,245 | $9,558,176 | $7,730,492 | -$1,827,684 | -19.12% | |
| Jump Financial, Llc | 0.08% | 402,846 | $8,806,214 | $7,122,317 | -$1,683,897 | -19.12% |
Frequently asked questions about SNDX
Who owns the most SNDX stock?
The largest holders of SNDX are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for SYNDAX PHARMACEUTICALS INC (SNDX).
Is SNDX widely held by superinvestors?
Many widely followed stocks like SNDX appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly SNDX is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.