Nicholas A.j. Botwood - 11 Jun 2026 Form 4 Insider Report for Syndax Pharmaceuticals Inc (SNDX)

Reporting relationship: Head of R&D, CMO
Issuer ticker: SNDX
Reported as of: 11 Jun 2026
Net transaction value: -$1,183,643
SEC form: 4
Accepted by SEC: 12 Jun 2026, 17:09:52 UTC
Prior SEC filing: 06 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ Michael A. Metzger, Attorney-in-Fact

Key filing fact

Nicholas A.j. Botwood filed Form 4 for Syndax Pharmaceuticals Inc (SNDX) on 12 Jun 2026.

Key facts

This page summarizes Nicholas A.j. Botwood's Form 4 filing for Syndax Pharmaceuticals Inc (SNDX).
6 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 12 Jun 2026, 17:09.

Change

Previous filing in this sequence was filed on 06 Feb 2026.
Current net transaction value: -$1,183,643.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002066784 Primary reporting owner

Botwood Nicholas A.J.

Relationship: Head of R&D, CMO
Address: 730 THIRD AVENUE, FLOOR 9, NEW YORK
Signature: /s/ Michael A. Metzger, Attorney-in-Fact
Signature date: 12 Jun 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

SNDX transaction

Common Stock

Options Exercise

Transaction value
Shares: +22,515
Change %: +31%
Price: $13.82^*
Shares after: 95,165
Date: 11 Jun 2026
Ownership: Direct

SNDX transaction

Common Stock

Sale

Transaction value: $617,040
Shares: -34,280
Change %: -36%
Price: $18.00
Shares after: 60,885
Date: 11 Jun 2026
Ownership: Direct
Footnotes: F1, F2

SNDX transaction

Common Stock

Options Exercise

Transaction value
Shares: +31,235
Change %: +51%
Price: $13.82^*
Shares after: 92,120
Date: 12 Jun 2026
Ownership: Direct

SNDX transaction

Common Stock

Sale

Transaction value: $566,603
Shares: -31,235
Change %: -34%
Price: $18.14
Shares after: 60,885
Date: 12 Jun 2026
Ownership: Direct
Footnotes: F1, F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

SNDX transaction Derivative

Stock options (Right to buy)

Options Exercise

Transaction value
Shares: +22,515
Change %
Price: $0.000000^*
Shares after: 0
Date: 11 Jun 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 22,515
Exercise price: $13.82
Footnotes: F4

SNDX transaction Derivative

Stock options (Right to buy)

Options Exercise

Transaction value
Shares: +31,235
Change %
Price: $0.000000^*
Shares after: 0
Date: 12 Jun 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 31,235
Exercise price: $13.82
Footnotes: F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 4 footnotes

Footnote F1

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 plan adopted by the Reporting Person. Following the sales reported in this Form 4, the Reporting Person has a total of 16,537 options to purchase shares of common stock that are vested and immediately exercisable and a total of 289,413 options to purchase shares of common stock that have not yet vested.

Footnote F2

These transactions were executed in multiple trades at prices ranging from $17.31 to $18.10. The price reported above reflects the weighted-average sale price of all transactions executed on that date.

Footnote F3

These transactions were executed in multiple trades at prices ranging from $18.00 to $18.32. The price reported above reflects the weighted-average sale price of all transactions executed on that date.

Footnote F4

The shares sold in this transaction were fully vested.