Syndax Pharmaceuticals, Inc.
US ˙ NasdaqGS ˙ US87164F1057

SecuritySNDX / Syndax Pharmaceuticals, Inc.
InstitutionWalleye Capital LLC
Latest Disclosed Ownership384,973 shares
Latest Disclosed Value $ 8,992,969
Walleye Capital LLC ownership in SNDX / Syndax Pharmaceuticals, Inc.

On May 13, 2026 - Walleye Capital LLC filed a 13F-HR/A form disclosing ownership of 384,973 shares of Syndax Pharmaceuticals, Inc. (US:SNDX) valued at $8,992,969 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 24,205 shares of Syndax Pharmaceuticals, Inc.. This represents a change in shares of 1,490.47% during the quarter. The current value of the position is $6,675,432 USD.

Walleye Capital LLC has a history of taking positions in derivatives of the underlying security (SNDX) in the form of stock options. The firm currently holds call options representing 5,400 of underlying shares valued at $126,144 USD and put options representing 11,700 of underlying shares valued at $273,312 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

SNDX / Syndax Pharmaceuticals, Inc. Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-13 2026-03-31 13F/A-1 SYNDAX PHARMACEUTICALS COM 87164F105 384,973 360,768 1,490.47 8,993 1,670.08 0.0374
2026-05-08 2026-03-31 13F SYNDAX PHARMACEUTICALS COM 87164F105 384,973 360,768 8,993 0.0374
2026-02-13 2025-12-31 13F SYNDAX PHARMACEUTICALS COM 87164F105 24,205 -273,453 -91.87 509 -88.91 0.0016
2025-11-14 2025-09-30 13F SYNDAX PHARMACEUTICALS COM 87164F105 297,658 71,643 31.70 4,579 116.40 0.0172
2025-08-13 2025-06-30 13F SYNDAX PHARMACEUTICALS COM 87164F105 226,015 -101,119 -30.91 2,117 -47.34 0.0082
2025-05-14 2025-03-31 13F SYNDAX PHARMACEUTICALS COM 87164F105 327,134 -37,616 -10.31 4,019 -16.66 0.0181
2025-02-13 2024-12-31 13F SYNDAX PHARMACEUTICALS COM 87164F105 364,750 326,585 855.72 4,822 556.81 0.0118
2024-11-14 2024-09-30 13F SYNDAX PHARMACEUTICALS COM 87164F105 38,165 38,165 735 0.0015
2024-05-15 2024-03-31 13F SYNDAX PHARMACEUTICALS COM 87164F105 0 -127,932 -100.00 0 -100.00
2024-02-14 2023-12-31 13F SYNDAX PHARMACEUTICALS COM 87164F105 127,932 127,932 2,765 0.0059
2023-11-21 2023-09-30 13F/A-1 SYNDAX PHARMACEUTICALS COM 87164F105 0 -264,464 -100.00 0 -100.00
2023-11-14 2023-09-30 13F SYNDAX PHARMACEUTICALS COM 87164F105 0 -264,464 0
2023-08-14 2023-06-30 13F SYNDAX PHARMACEUTICALS COM 87164F105 264,464 -280,626 -51.48 5,535 -51.92 0.0201
2023-05-15 2023-03-31 13F SYNDAX PHARMACEUTICALS COM 87164F105 545,090 213,539 64.41 11,512 36.45 0.1725
2023-02-14 2022-12-31 13F SYNDAX PHARMACEUTICALS COM 87164F105 331,551 331,551 8,438 0.1539
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-13 2026-03-31 13F/A SYNDAX PHARMACEUTICALS COM Call 5,400 -60.58 126 -56.10 n/a n/a n/a
2026-05-08 2026-03-31 13F SYNDAX PHARMACEUTICALS COM Call 5,400 126 n/a n/a n/a
2026-02-13 2025-12-31 13F SYNDAX PHARMACEUTICALS COM Call 13,700 -27.13 288 -0.69 n/a n/a n/a
2025-11-14 2025-09-30 13F SYNDAX PHARMACEUTICALS COM Call 18,800 -36.49 289 4.33 n/a n/a n/a
2025-08-13 2025-06-30 13F SYNDAX PHARMACEUTICALS COM Call 29,600 277 n/a n/a n/a
2025-02-13 2024-12-31 13F SYNDAX PHARMACEUTICALS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-11-14 2024-09-30 13F SYNDAX PHARMACEUTICALS COM Call 1,000 19 n/a n/a n/a
2024-05-15 2024-03-31 13F SYNDAX PHARMACEUTICALS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-02-14 2023-12-31 13F SYNDAX PHARMACEUTICALS COM Call 4,100 89 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-13 2026-03-31 13F/A SYNDAX PHARMACEUTICALS COM Put 11,700 -15.83 273 -6.51 n/a n/a n/a
2026-05-08 2026-03-31 13F SYNDAX PHARMACEUTICALS COM Put 11,700 273 n/a n/a n/a
2026-02-13 2025-12-31 13F SYNDAX PHARMACEUTICALS COM Put 13,900 -37.39 292 -14.37 n/a n/a n/a
2025-11-14 2025-09-30 13F SYNDAX PHARMACEUTICALS COM Put 22,200 -22.38 342 27.72 n/a n/a n/a
2025-08-13 2025-06-30 13F SYNDAX PHARMACEUTICALS COM Put 28,600 268 n/a n/a n/a
2024-05-15 2024-03-31 13F SYNDAX PHARMACEUTICALS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2024-02-14 2023-12-31 13F SYNDAX PHARMACEUTICALS COM Put 6,500 140 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.