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Equibles

SNDX

Syndax Pharmaceuticals Inc

Company with tickers: SNDX

CIK
1395937
CUSIP
87164F105
Shares Outstanding
88,610,027
13F Activity (30d)
170 filings 166 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 246
Total Value: $2,338,425,447
Total Shares: 100,103,836
Showing 1–100 of 260 holdings by value · page 1 of 3

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 246 13F filers · Δ vs Dec 31, 2025
Top Holder
8.2%
Jun 2023 → Mar 2026 · range 8.1% – 10.5%
+0.2 pts
Top 5
30.0%
Jun 2023 → Mar 2026 · range 29.5% – 33.8%
−2.5 pts
Top 10
45.3%
Jun 2023 → Mar 2026 · range 45.1% – 53.1%
−4.3 pts
HHI
302
Jun 2023 → Mar 2026 · range 302 – 387
Broadly held −32

Quarterly Activity

vs Dec 31, 2025
New
44
Increased
97
Decreased
71
Sold Out
29
Unchanged
34
Holder count: +15
Institutional value: +9.3%
Shares held: -1.7%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega TWO SIGMA INVESTMENTS, LP +432,660 1,579,596
Mega CITADEL ADVISORS LLC +399,239 767,542
Mega D. E. Shaw & Co., Inc. +382,287 1,601,896
Mega UBS Group AG +365,143 1,153,662
Large BNP PARIBAS ASSET MANAGEMENT Holding S.A. +356,860 1,732,541

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Large Point72 Asset Management, L.P. −2,896,506 1,985,547
Mega GOLDMAN SACHS GROUP INC −698,588 4,996,787
Large Qube Research & Technologies Ltd −652,090 36,047
Large Ensign Peak Advisors, Inc −607,575 990,969
Mid Soleus Capital Management, L.P. −520,202 1,726,908

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 3,822,579 $89,295,445
Mid DEERFIELD MANAGEMENT COMPANY, L.P. 3,779,900 $88,298,464
Mega VANGUARD PORTFOLIO MANAGEMENT LLC 1,737,141 $40,579,613
Mid ORBIMED ADVISORS LLC 962,300 $22,479,328
Small Trails Edge Capital Partners, LP 701,821 $16,394,538

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 6,230,334 $130,899,314
Mid EVENTIDE ASSET MANAGEMENT, LLC 1,238,196 $26,014,497
Large TWO SIGMA ADVISERS, LP 632,752 $13,294,119
Large Caption Management, LLC 554,500 $11,650,045
Mid Jump Financial, LLC 163,915 $3,443,854
Filter: New 44 Increased 97 Reduced 71 Sold out 29 Unchanged 34
Showing 100 of 260
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega BlackRock, Inc. $192,823,384 8.25% 8,254,426
Mid Kynam Capital Management, LP $188,070,402 8.04% 8,050,959
Mega GOLDMAN SACHS GROUP INC $116,724,943 4.99% 4,996,787
Mega STATE STREET CORP $103,486,575 4.43% 4,430,076
Mega BANK OF AMERICA CORP /DE/ Bank $99,276,168 4.25% 4,249,836
Mega VANGUARD CAPITAL MANAGEMENT LLC $89,295,445 3.82% 3,822,579
Mid DEERFIELD MANAGEMENT COMPANY, L.P. $88,298,464 3.78% 3,779,900
Mid Eversept Partners, LP $67,408,129 2.88% 2,885,622
Small KINGDON CAPITAL MANAGEMENT, L.L.C. $58,400,000 2.50% 2,500,000
Mid Hood River Capital Management LLC $54,996,097 2.35% 2,354,285
Mega GEODE CAPITAL MANAGEMENT, LLC $50,388,874 2.15% 2,157,058
Mega FRANKLIN RESOURCES INC $50,225,844 2.15% 2,150,079
Large Point72 Asset Management, L.P. $46,382,377 1.98% 1,985,547
Small Elmind Capital, LP $43,332,800 1.85% 1,855,000
Mega VANGUARD PORTFOLIO MANAGEMENT LLC $40,579,613 1.74% 1,737,141
Large BNP PARIBAS ASSET MANAGEMENT Holding S.A. $40,472,157 1.73% 1,732,541
Mid Soleus Capital Management, L.P. $40,340,570 1.73% 1,726,908
Mega D. E. Shaw & Co., Inc. $37,420,290 1.60% 1,601,896
Mega TWO SIGMA INVESTMENTS, LP $36,899,362 1.58% 1,579,596
Mega Nuveen, LLC $34,914,906 1.49% 1,494,645
Mid MPM BIOIMPACT LLC $31,319,522 1.34% 1,340,733
Small Aisling Capital Management LP $30,760,588 1.32% 1,316,806
Large Woodline Partners LP $29,217,753 1.25% 1,250,760
Small STEMPOINT CAPITAL LP $28,399,756 1.21% 1,215,743
Mega UBS Group AG $26,949,542 1.15% 1,153,662
Small Catalio Capital Management, LP $24,380,131 1.04% 1,043,670
Mega Bank of New York Mellon Corp Bank $23,465,070 1.00% 1,004,498
Large Ensign Peak Advisors, Inc $23,149,035 0.99% 990,969
Mega AQR CAPITAL MANAGEMENT LLC $22,900,129 0.98% 980,314
Mid ORBIMED ADVISORS LLC $22,479,328 0.96% 962,300
Mid ALGERT GLOBAL LLC $21,691,348 0.93% 928,568
Large Candriam S.C.A. $21,615,755 0.92% 925,332
Small Parkman Healthcare Partners LLC $21,059,296 0.90% 901,511
Mega MORGAN STANLEY $20,882,271 0.89% 893,933
Small SILVERARC CAPITAL MANAGEMENT, LLC $20,766,736 0.89% 888,987
Small Palo Alto Investors LP $20,206,072 0.86% 864,986
Small Prosight Management, LP $17,987,200 0.77% 770,000
Mega NORTHERN TRUST CORP Bank $17,653,595 0.75% 755,719
Small SPHERA FUNDS MANAGEMENT LTD. $16,925,791 0.72% 724,563
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $16,705,974 0.71% 715,153
Small Trails Edge Capital Partners, LP $16,394,538 0.70% 701,821
Mega CITADEL ADVISORS LLC $14,738,804 0.63% 630,942
Mega VANGUARD FIDUCIARY TRUST CO Bank $14,028,077 0.60% 600,517
Small Apis Capital Advisors, LLC $12,848,000 0.55% 550,000
Large RENAISSANCE TECHNOLOGIES LLC $11,637,952 0.50% 498,200
Small Knott David M Jr $9,857,920 0.42% 422,000
Large Walleye Capital LLC $8,992,969 0.38% 384,973
Small Rhenman & Partners Asset Management AB $8,859,280 0.38% 379,250
Mid Integral Health Asset Management, LLC $8,176,000 0.35% 350,000
Mega JANE STREET GROUP, LLC $7,838,003 0.34% 335,531
Large HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Pension $7,747,694 0.33% 331,665
Mid Granahan Investment Management, LLC $7,155,658 0.31% 306,321
Mega ALLIANCEBERNSTEIN L.P. $6,740,925 0.29% 288,567
Large Aberdeen Group plc $6,703,595 0.29% 286,969
Small SECTOR GAMMA AS $6,681,123 0.29% 286,007
Mid Pale Fire Capital SE $6,644,985 0.28% 284,460
Mega AMERIPRISE FINANCIAL INC $6,639,962 0.28% 284,245
Large Schonfeld Strategic Advisors LLC $6,088,223 0.26% 260,626
Mega JPMORGAN CHASE & CO $6,039,001 0.26% 258,519
Mega Invesco Ltd. $5,904,495 0.25% 252,761
Large PANAGORA ASSET MANAGEMENT INC $5,826,147 0.25% 249,407
Small PFM Health Sciences, LP $5,723,690 0.24% 245,021
Mega CANADA PENSION PLAN INVESTMENT BOARD Pension $5,363,456 0.23% 229,600
Large SEI INVESTMENTS CO $5,083,135 0.22% 217,600
Small DAFNA Capital Management LLC $5,077,412 0.22% 217,355
Mid Hennion & Walsh Asset Management, Inc. $5,017,891 0.21% 214,807
Mid Brevan Howard Capital Management LP $4,785,179 0.20% 204,845
Mid Pinnacle Financial Partners, Inc. $4,725,307 0.20% 202,282
Large Trexquant Investment LP $4,713,510 0.20% 201,777
Small Vienna Powszechne Towarzystwo Emerytalne S.A. Vienna Insurance Group Insurance $4,672,000 0.20% 200,000
Mega MILLENNIUM MANAGEMENT LLC $4,660,880 0.20% 199,524
Small ESSEX INVESTMENT MANAGEMENT CO LLC $4,648,289 0.20% 198,985
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $4,593,066 0.20% 196,621
Large Man Group plc $4,251,893 0.18% 182,016
Large Squarepoint Ops LLC $4,241,054 0.18% 181,552
Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. $4,204,800 0.18% 180,000
Mega FMR LLC $4,064,476 0.17% 173,993
Mega Swiss National Bank Bank $3,770,304 0.16% 161,400
Mid Atom Investors LP $3,643,342 0.16% 155,965
Small STEMPOINT CAPITAL LP $3,504,000 0.15% 150,000
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $3,499,254 0.15% 149,797
Large CAPITAL FUND MANAGEMENT S.A. $3,400,421 0.15% 145,566
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $3,333,472 0.14% 142,700
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $3,102,208 0.13% 132,800
Large Rafferty Asset Management, LLC $2,913,529 0.12% 124,723
Mega WELLINGTON MANAGEMENT GROUP LLP $2,886,967 0.12% 123,586
Mid Cinctive Capital Management LP $2,740,571 0.12% 117,319
Mega RHUMBLINE ADVISERS $2,680,840 0.11% 114,762
Large IEQ CAPITAL, LLC $2,560,793 0.11% 109,623
Mega PRICE T ROWE ASSOCIATES INC /MD/ $2,502,626 0.11% 107,133
Large ExodusPoint Capital Management, LP $2,453,991 0.10% 105,051
Small Torray Investment Partners LLC $2,449,716 0.10% 104,868
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $2,406,290 0.10% 103,009
Large Russell Investments Group, Ltd. $2,370,850 0.10% 101,492
Small Yelin Lapidot Holdings Management Ltd. $2,249,497 0.10% 96,297
Small TWINBEECH CAPITAL LP $2,102,540 0.09% 90,006
Large HRT FINANCIAL LP $2,076,797 0.09% 88,904
Mega WELLS FARGO & COMPANY/MN $1,878,002 0.08% 80,394
Mid XTX Topco Ltd $1,845,603 0.08% 79,007
Mega DEUTSCHE BANK AG\ Bank $1,751,602 0.07% 74,983

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