Stephen Thomas

About Stephen Thomas

Stephen Thomas is a co-founder and CEO, sera medicine, director at Navigator Medicines.

Form D filings also name Stephen Thomas as an executive officer and promoter at Memento Medicines and a chief executive officer and director at Lonestar Medicines.

Stephen Thomas reports to the SEC as a director of 1 public company: Climb Bio (CLYM).

Stephen Thomas first appears on SEC filings in 2024.

Experience

This experience comes from Stephen Thomas's profile and from SEC filings. For roles taken from filings, the years are when the filings name Stephen Thomas in the role, so the role may have started earlier or lasted longer.

Navigator Medicines, Inc. Current

Co-Founder and CEO, Sera Medicine, director

2024 – Present · San Mateo, CA

Develops antibody treatments for people with inflammatory and autoimmune diseases.

CI

Climb Bio, Inc. Current

Director

2024 – Present · Public company (CLYM)

SL

Sera Medicines, LLC Current

Co-Founder, Chief Executive Officer

2023 – Present

Memento Medicines, Inc.

Executive officer and promoter

2026 · Boston, MA

Develops antibody therapies for people with retinal diseases.

LM

Lonestar Medicines, Inc.

Chief Executive Officer and director

2026 · Boston, MA

CI

Cerecor, Inc.

VP, Head of Discovery

2018 – 2020

VL

Vyera Pharmaceuticals, LLC

Director, Discovery Research

2015 – 2017

CY

Columbia University in the City of New York

Graduate Research Fellow

2010 – 2015

CV

Columbia Technology Ventures

Senior Fellow

2012 – 2014

RI

Rensselaer Polytechnic Institute

Undergraduate Research Associate

2007 – 2010

AM

Amgen

Amgen Scholar

2009

Key Colleagues at Startups

The people Stephen Thomas works with at each company, as listed on that company's latest Form D.

Sources

1. SECNavigator Medicines, Inc. Form D, filed Sep 25, 2026
2. SECMemento Medicines, Inc. Form D, filed Jun 16, 2026
3. SECLonestar Medicines, Inc. Form D, filed Feb 23, 2026
4. SECForms 3, 4 and 5 filed by Stephen Thomas (SEC filer 2027962)