InsiderSource
SNDX

Syndax Pharmaceuticals Inc

SEC CIK 1395937
$18.55 −11.7% · 90 days
90-day buys
$0
0 open-market
90-day sells
$1.34M
4 open-market
Net insider flow
−$1.34M
Net selling
Filings shown
39
Most recent
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At a glance

Over the last 90 days, insiders at SNDX have sold a net $1.34M of stock (0 open-market buys vs 4 sells).

Largest recent trade: Metzger Michael A sold $2.58M of SNDX, trimming their stake 34%.

Most active filer: Metzger Michael A, with 11 transactions among the recent filings shown.

Insider transaction history

Form 4 filings for SNDX, newest first
View on SEC EDGAR ↗
SNDX
Syndax Pharmaceuticals Inc
Sell Goldan Keith A. · Chief Financial Officer · Open-market sale · filed 2w ago ΔOwn −0.8%

Goldan Keith A. sold $22.4K of SNDX, trimming their stake 1%.

−$22.4K
1,177 sh @ $19
SNDX
Syndax Pharmaceuticals Inc
Sell Metzger Michael A · Director, Chief Executive Officer · Open-market sale · filed 2w ago ΔOwn −1.4%

Metzger Michael A sold $130K of SNDX, trimming their stake 1%.

−$130K
6,847 sh @ $19
SNDX
Syndax Pharmaceuticals Inc
Sell Metzger Michael A · Director, Chief Executive Officer · Open-market sale · filed Feb 10, 2026 ΔOwn −3.4%

Metzger Michael A sold $360.8K of SNDX, trimming their stake 3%.

−$360.8K
17,159 sh @ $21
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SNDX
Syndax Pharmaceuticals Inc
Sell Goldan Keith A. · Chief Financial Officer · Open-market sale · filed Feb 10, 2026 ΔOwn −2.4%

Goldan Keith A. sold $71.7K of SNDX, trimming their stake 2%.

−$71.7K
3,410 sh @ $21
SNDX
Syndax Pharmaceuticals Inc
Sell Metzger Michael A · Director, Chief Executive Officer · Open-market sale · filed Feb 6, 2026 ΔOwn −1.4%

Metzger Michael A sold $152.8K of SNDX, trimming their stake 1%.

−$152.8K
7,412 sh @ $21
SNDX
Syndax Pharmaceuticals Inc
Sell Goldan Keith A. · Chief Financial Officer · Open-market sale · filed Feb 6, 2026 ΔOwn −1.4%

Goldan Keith A. sold $42.9K of SNDX, trimming their stake 1%.

−$42.9K
2,082 sh @ $21
SNDX
Syndax Pharmaceuticals Inc
Sell Metzger Michael A · Director, Chief Executive Officer · Open-market sale · filed Sep 8, 2025 ΔOwn −34%

Metzger Michael A sold $2.58M of SNDX, trimming their stake 34%.

−$2.58M
157,307 sh @ $16
SNDX
Syndax Pharmaceuticals Inc
Sell Podlesak Dennis · Director · Open-market sale · filed Aug 18, 2025 ΔOwn −9.1%

Podlesak Dennis sold $304.2K of SNDX, trimming their stake 9%.

−$304.2K
19,200 sh @ $16
SNDX
Syndax Pharmaceuticals Inc
Sell Podlesak Dennis · Director · Open-market sale · filed Aug 18, 2025 ΔOwn −9.1%

Podlesak Dennis sold $298.4K of SNDX, trimming their stake 9%.

−$298.4K
19,200 sh @ $16
SNDX
Syndax Pharmaceuticals Inc
Sell Podlesak Dennis · Director · Open-market sale · filed Aug 18, 2025 ΔOwn −9.1%

Podlesak Dennis sold $272.5K of SNDX, trimming their stake 9%.

−$272.5K
19,200 sh @ $14
SNDX
Syndax Pharmaceuticals Inc
Sell Goldan Keith A. · Chief Financial Officer · Open-market sale · filed Jul 18, 2025 ΔOwn −1.4%

Goldan Keith A. sold $12K of SNDX, trimming their stake 1%.

−$12K
1,296 sh @ $9
SNDX
Syndax Pharmaceuticals Inc
Sell Metzger Michael A · Director, Chief Executive Officer · Open-market sale · filed Jul 18, 2025 ΔOwn −2.5%

Metzger Michael A sold $70K of SNDX, trimming their stake 2%.

−$70K
7,534 sh @ $9
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About SNDX insider activity

This page tracks every recent Form 4 filed for Syndax Pharmaceuticals Inc with the U.S. Securities and Exchange Commission. Form 4 is the disclosure that company insiders — officers, directors, and holders of more than 10% of the stock — must file within two business days of buying or selling shares.

The summary above nets open-market purchases against open-market sales over the trailing 90 days. Open-market trades (codes P and S) tend to carry the most signal because they reflect a deliberate choice to put money in or take it out, as opposed to routine grants, option exercises, or tax-withholding events. Use the badges on each row to tell them apart, and always confirm details against the original filing before drawing conclusions.

Frequently asked questions

How often is SNDX insider data updated?

Continuously. We read from SEC EDGAR, so new Form 4 filings for Syndax Pharmaceuticals Inc usually appear here within minutes of being accepted by the SEC.

What does "net insider flow" mean?

It is the total dollar value of open-market insider purchases minus open-market sales over the last 90 days. A positive number (green) means insiders bought more than they sold; a negative number (red) means the reverse.

Why do some rows show grants or option exercises instead of buys?

Insiders receive stock through compensation as well as buying it outright. Form 4 captures all of these. We label each transaction by its SEC code so you can focus on open-market activity if you prefer.

Is this investment advice?

No. InsiderSource presents public filing data for informational purposes only. Insider activity is one of many factors to consider and is never a recommendation to buy or sell.