Profile

Identity, professional record and current appointments.

Overview

Professional record at a glance

A concise summary of information supported by the cited public sources. Missing information is treated as unknown, not as a negative finding.

Current roles
11 current organization shown on this profile
Board positions
Not establishedNo board position is currently listed on this profile
Committee roles
Not establishedNo committee role is currently confirmed by the cited sources
Qualifications
Not establishedNo qualification is currently confirmed by the cited sources

Professional narrative

About

Steve Closter has served as Chief Commercial Officer since March 2024, previously serving in various roles at Sunovion Pharmaceuticals (consolidated into Sumitomo Pharma America) including VP of Brand Strategy and Launch Excellence. He also spent nearly 20 years in senior marketing and commercial roles at Forest Laboratories and Allergan, most recently as VP of Marketing.

Sources are shown with the information they support.

Current roles

Appointments & responsibilities

Executive appointments

Governance

Board appointments, committee responsibilities and disclosed relationships.

Connections

Explore the roles, education and affiliations published in this record.

Syndax Pharmaceuticals Inc

Open Syndax Pharmaceuticals Inc profile →

Chief Commercial Officer at Syndax Pharmaceuticals Inc

Start not stated → End not stated

current · source reported

Observed: 2026-09-15

Syndax Pharmaceuti…Syndax Pharmaceuticals IncSteve Closter

Dashed lines mark past roles. Select a connection to see its dates and sources.

Relationship map

Connected through the public record

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Direct public links only

Only published affiliations are shown here. Private relationships require authorized access.

Experience

Career history, education, credentials and public contributions.

Published record

Featured coverage

Selected publications and public sources used to establish this profile. Inclusion records provenance; it is not an endorsement.

Source 1 · Sec FilingSNDX DEF 14A executive officersSupports AI and ML experience, Cybersecurity experience, Executive company, Executive title, Technology background.Open source

Basis

Identifiers, sources, dates and record limitations.

Identifiers

Alpha ID
alpha:person:steve-closter
Record version
public-0

Sources

Sources and published information

Each item links to the public source used to support it. When sources disagree, the item is clearly marked for review.

AI and ML experience · Source reportedAI and ML experience: not identified in the cited filing1 source
Verification
Source reported
Confidence
72%
Last reviewed
May 5, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 5, 2026

Cybersecurity experience · Source reportedCybersecurity experience: not identified in the cited filing1 source
Verification
Source reported
Confidence
72%
Last reviewed
May 5, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 5, 2026

Executive company · Source reportedExecutive at Syndax Pharmaceuticals Inc1 source
Verification
Source reported
Confidence
94%
Last reviewed
May 5, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 5, 2026

Executive title · Source reportedExecutive title: Chief Commercial Officer1 source
Verification
Source reported
Confidence
94%
Last reviewed
May 5, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 5, 2026

Technology background · Source reportedTechnology background: not identified in the cited filing1 source
Verification
Source reported
Confidence
72%
Last reviewed
May 5, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 5, 2026

View all sources2 records
  1. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 5, 2026

    Supports: AI and ML experience · Cybersecurity experience · Executive company · Executive title · Technology background

  2. https://www.sec.gov/Archives/edgar/data/1395937/000119312526197859/sndx-20260430.htm

    Sec Def 14a · Tier not stated · Reviewed Sep 13, 2026

    Supports: Chief Commercial Officer at Syndax Pharmaceuticals Inc (NASDAQ: SNDX)