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SNDX · Syndax Pharmaceuticals Inc

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$19.54 -0.62 (-3.08%) At close · Aug 28
Market Cap
$1.74B
Shares
89.30M

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: 243
Total Value: $2,375,888,459
Total Shares: 108,686,608
Showing 1–100 of 252 holdings by value · page 1 of 3

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 243 13F filers · Δ vs Mar 31, 2026
Top Holder
8.3%
Sep 2023 → Jun 2026 · range 8.1% – 10.0%
+0.0 pts
Top 5
30.0%
Sep 2023 → Jun 2026 · range 29.5% – 33.8%
+0.1 pts
Top 10
44.4%
Sep 2023 → Jun 2026 · range 44.4% – 52.1%
−0.9 pts
HHI
295
Sep 2023 → Jun 2026 · range 295 – 357
Broadly held−7

Quarterly Activity

vs Mar 31, 2026
New
37
Increased
96
Decreased
77
Sold Out
42
Unchanged
33
Holder count: -5
Institutional value: +1.7%
Shares held: +8.5%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 252
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1395937 CUSIP 87164F105 13F (30d) 217 filings 214 filers Visit website Investor relations