---
title: "THESEUS PHARMACEUTICALS, INC. — Ownership Dossier"
canonical: https://whiteintel.dev/entity/d4fec44b-38d2-5d2c-be50-ac6cbffeae5e
json: https://whiteintel.dev/api/public/dossier/d4fec44b-38d2-5d2c-be50-ac6cbffeae5e
identifier: sec:0001745020
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# THESEUS PHARMACEUTICALS, INC.

**Type:** Company  
**Jurisdiction:** US  
**Identifier:** `sec:0001745020`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/d4fec44b-38d2-5d2c-be50-ac6cbffeae5e  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/d4fec44b-38d2-5d2c-be50-ac6cbffeae5e  

## Ownership & control

### Owners / controllers

- **OrbiMed Genesis GP LLC** (tenpercentowner) — https://whiteintel.dev/entity/05bd049a-9f07-53d5-9f57-bfabd4d7e13a
- **OrbiMed Capital GP VII LLC** (tenpercentowner) — https://whiteintel.dev/entity/9eda48eb-e9bf-52a5-8464-61da1d263b5d
- **YI KATHY** (director) — https://whiteintel.dev/entity/5908f192-3132-50af-af2a-f653efcae24f
- **OrbiMed Genesis GP LLC** (director) — https://whiteintel.dev/entity/05bd049a-9f07-53d5-9f57-bfabd4d7e13a
- **ORBIMED ADVISORS LLC** (tenpercentowner) — https://whiteintel.dev/entity/4fe8d3ec-3487-5b04-877d-c8ddaf0718be
- **HAYDEN DONALD J JR** (director) — https://whiteintel.dev/entity/6dce0256-73f0-5235-b2ff-673133f67419
- **Stein Steven H** (director) — https://whiteintel.dev/entity/50170f34-30d2-5a58-afea-60231354f2ff
- **DUKES IAIN D.** (director) — https://whiteintel.dev/entity/407c8c6c-678f-58a4-a342-fc6b31611bb1
- **ORBIMED ADVISORS LLC** (director) — https://whiteintel.dev/entity/4fe8d3ec-3487-5b04-877d-c8ddaf0718be
- **DAHMS BRADFORD D.** (officer) — https://whiteintel.dev/entity/609ba946-2e7f-5212-b612-c3a69fba174b
- **GORDON CARL L** (tenpercentowner) — https://whiteintel.dev/entity/f66dc571-93f9-5939-b406-a01b6c73b2c8
- **GORDON CARL L** (director) — https://whiteintel.dev/entity/f66dc571-93f9-5939-b406-a01b6c73b2c8
- **OrbiMed Capital GP VII LLC** (director) — https://whiteintel.dev/entity/9eda48eb-e9bf-52a5-8464-61da1d263b5d
- **SHAKESPEARE WILLIAM** (officer) — https://whiteintel.dev/entity/5cf9c82a-6fc9-5bd0-ac3b-b3116c15b8e4
- **TANANBAUM JAMES B.** (tenpercentowner) — https://whiteintel.dev/entity/bdac58e1-8b66-5151-8fcb-f85623517b5e
- **FORESITE CAPITAL FUND V, L.P.** (tenpercentowner) — https://whiteintel.dev/entity/78e18e22-9b7d-562c-bf99-ece9db2bc87e
- **FORESITE CAPITAL OPPORTUNITY MANAGEMENT V, LLC** (tenpercentowner) — https://whiteintel.dev/entity/1610615c-ca10-54ac-820c-15856f86d2fb
- **FORESITE CAPITAL MANAGEMENT V, LLC** (tenpercentowner) — https://whiteintel.dev/entity/1790fe10-670f-5d01-a5d9-fb51e2789442
- **FORESITE CAPITAL OPPORTUNITY FUND V, L.P.** (tenpercentowner) — https://whiteintel.dev/entity/88601129-3c8e-5e3a-b5ae-00fa33dfb92c
- **CLACKSON TIMOTHY P** (director) — https://whiteintel.dev/entity/1f415b57-b4f6-59ac-962f-06eb62891cc5
- **RIVERA VICTOR** (officer) — https://whiteintel.dev/entity/8ae89f53-c4e5-5b63-9db4-8ca8baf5dad9
- **CLACKSON TIMOTHY P** (officer) — https://whiteintel.dev/entity/1f415b57-b4f6-59ac-962f-06eb62891cc5
- **KERSTEIN DAVID** (officer) — https://whiteintel.dev/entity/7278c569-2eb8-5ae6-a349-6c77ff328c44
- **DUKES IAIN D.** (officer) — https://whiteintel.dev/entity/407c8c6c-678f-58a4-a342-fc6b31611bb1
- **DALGARNO DAVID** (officer) — https://whiteintel.dev/entity/26a43626-7f73-5e84-b833-99c1ef57861e
- **DUKES IAIN D.** (directorother) — https://whiteintel.dev/entity/407c8c6c-678f-58a4-a342-fc6b31611bb1
- **ROCK SPRINGS CAPITAL MASTER FUND LP** (tenpercentowner) — https://whiteintel.dev/entity/2f68d5c8-2b1f-512d-a3e2-6f1547b726b7
- **ARIAD PHARMACEUTICALS INC** (tenpercentowner) — https://whiteintel.dev/entity/779d9c9c-607f-5f52-bb57-b77273ced10d
- **ROCK SPRINGS CAPITAL MANAGEMENT LP** (tenpercentowner) — https://whiteintel.dev/entity/763acb2a-48c2-5645-83b3-00bfc31dfdf8
- **ROME MICHAEL E** (director) — https://whiteintel.dev/entity/a69a5875-dd70-5edf-8148-0cec92e1286c
- **OMEGA FUND VI, L.P.** (tenpercentowner) — https://whiteintel.dev/entity/35c3c78f-3021-51e2-928b-cdffee4b70d0
- **TAKEDA PHARMACEUTICAL CO LTD** (tenpercentowner) — https://whiteintel.dev/entity/4bf315f3-ff14-5761-9d53-c9dd75c5da78
- **OMEGA FUND VI GP MANAGER, LTD.** (tenpercentowner) — https://whiteintel.dev/entity/3f293d63-27cf-5a8b-9e3b-f7bf831f4588
- **PASTER ANNE-MARI** (other) — https://whiteintel.dev/entity/2de36916-fa13-5f7b-9153-52823e0e8fe3
- **OMEGA FUND VI GP, L.P.** (tenpercentowner) — https://whiteintel.dev/entity/b56735c2-27b5-5144-bae9-7e4514315b54
- **STAMPACCHIA OTELLO** (other) — https://whiteintel.dev/entity/30cf45bd-bb41-51d0-aa88-275254a2f52c
- **NESSI CLAUDIO** (other) — https://whiteintel.dev/entity/7892a232-56b8-533a-92b4-70fd99978bd7
- **OMEGA FUND VI, L.P.** (other) — https://whiteintel.dev/entity/35c3c78f-3021-51e2-928b-cdffee4b70d0
- **NESSI CLAUDIO** (tenpercentowner) — https://whiteintel.dev/entity/7892a232-56b8-533a-92b4-70fd99978bd7
- **STAMPACCHIA OTELLO** (tenpercentowner) — https://whiteintel.dev/entity/30cf45bd-bb41-51d0-aa88-275254a2f52c
- **OMEGA FUND VI GP MANAGER, LTD.** (other) — https://whiteintel.dev/entity/3f293d63-27cf-5a8b-9e3b-f7bf831f4588
- **ROCK SPRINGS CAPITAL LLC** (tenpercentowner) — https://whiteintel.dev/entity/9ca53525-408c-5bdd-b4da-81d0db0787ec
- **PASTER ANNE-MARI** (tenpercentowner) — https://whiteintel.dev/entity/2de36916-fa13-5f7b-9153-52823e0e8fe3

### UBO chain (walk to the ultimate owner)

1. **OrbiMed Genesis GP LLC** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **OrbiMed Capital GP VII LLC** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **YI KATHY** — director → *THESEUS PHARMACEUTICALS, INC.*
1. **OrbiMed Genesis GP LLC** — director → *THESEUS PHARMACEUTICALS, INC.*
1. **ORBIMED ADVISORS LLC** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **HAYDEN DONALD J JR** — director → *THESEUS PHARMACEUTICALS, INC.*
1. **Stein Steven H** — director → *THESEUS PHARMACEUTICALS, INC.*
1. **DUKES IAIN D.** — director → *THESEUS PHARMACEUTICALS, INC.*
1. **ORBIMED ADVISORS LLC** — director → *THESEUS PHARMACEUTICALS, INC.*
1. **DAHMS BRADFORD D.** — officer → *THESEUS PHARMACEUTICALS, INC.*
1. **GORDON CARL L** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **GORDON CARL L** — director → *THESEUS PHARMACEUTICALS, INC.*
1. **OrbiMed Capital GP VII LLC** — director → *THESEUS PHARMACEUTICALS, INC.*
1. **SHAKESPEARE WILLIAM** — officer → *THESEUS PHARMACEUTICALS, INC.*
1. **TANANBAUM JAMES B.** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **FORESITE CAPITAL FUND V, L.P.** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **FORESITE CAPITAL OPPORTUNITY MANAGEMENT V, LLC** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **FORESITE CAPITAL MANAGEMENT V, LLC** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **FORESITE CAPITAL OPPORTUNITY FUND V, L.P.** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **CLACKSON TIMOTHY P** — director → *THESEUS PHARMACEUTICALS, INC.*
1. **RIVERA VICTOR** — officer → *THESEUS PHARMACEUTICALS, INC.*
1. **CLACKSON TIMOTHY P** — officer → *THESEUS PHARMACEUTICALS, INC.*
1. **KERSTEIN DAVID** — officer → *THESEUS PHARMACEUTICALS, INC.*
1. **DUKES IAIN D.** — officer → *THESEUS PHARMACEUTICALS, INC.*
1. **DALGARNO DAVID** — officer → *THESEUS PHARMACEUTICALS, INC.*
1. **DUKES IAIN D.** — directorother → *THESEUS PHARMACEUTICALS, INC.*
1. **ROCK SPRINGS CAPITAL MASTER FUND LP** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **ARIAD PHARMACEUTICALS INC** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **ROCK SPRINGS CAPITAL MANAGEMENT LP** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **ROME MICHAEL E** — director → *THESEUS PHARMACEUTICALS, INC.*
1. **OMEGA FUND VI, L.P.** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **TAKEDA PHARMACEUTICAL CO LTD** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **OMEGA FUND VI GP MANAGER, LTD.** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **PASTER ANNE-MARI** — other → *THESEUS PHARMACEUTICALS, INC.*
1. **OMEGA FUND VI GP, L.P.** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **STAMPACCHIA OTELLO** — other → *THESEUS PHARMACEUTICALS, INC.*
1. **NESSI CLAUDIO** — other → *THESEUS PHARMACEUTICALS, INC.*
1. **OMEGA FUND VI, L.P.** — other → *THESEUS PHARMACEUTICALS, INC.*
1. **NESSI CLAUDIO** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **STAMPACCHIA OTELLO** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **OMEGA FUND VI GP MANAGER, LTD.** — other → *THESEUS PHARMACEUTICALS, INC.*
1. **ROCK SPRINGS CAPITAL LLC** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
1. **PASTER ANNE-MARI** — tenpercentowner → *THESEUS PHARMACEUTICALS, INC.*
2. **IBRAHIM RAMY RIAD AHMED** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **RICCI GABRIELE** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **KIM JULIE SO-YOUNG** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **PLUMP ANDREW STEWART** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **FARAJALLAH AWNY SAMAAN BOTROS** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **SMOTER JENNIFER MARIE** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **PLUMP ANDREW STEWART** — director → *TAKEDA PHARMACEUTICAL CO LTD*
2. **FURUTA MILANO** — director → *TAKEDA PHARMACEUTICAL CO LTD*
2. **BITETTI TERESA MARIE** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **GREENWAY NICOLA DEIDRE PETAL** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **WEBER CHRISTOPHE PIERRE** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **WEBER CHRISTOPHE PIERRE** — director → *TAKEDA PHARMACEUTICAL CO LTD*
2. **DUPREY LAUREN RUSCKOWSKI** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **PLATFORD GILES RICHARD** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **PIGNAGNOLI AGOSTI MARCELLO** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **FURUTA MILANO** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **REED KIMBERLY A.** — director → *TAKEDA PHARMACEUTICAL CO LTD*
2. **IIJIMA MASAMI** — director → *TAKEDA PHARMACEUTICAL CO LTD*
2. **BUTEL JEAN LUC** — director → *TAKEDA PHARMACEUTICAL CO LTD*
2. **GILLIS STEVEN** — director → *TAKEDA PHARMACEUTICAL CO LTD*
2. **HATSUKAWA KOJI** — director → *TAKEDA PHARMACEUTICAL CO LTD*
2. **CLARK IAN T** — director → *TAKEDA PHARMACEUTICAL CO LTD*
2. **FUJIMORI YOSHIAKI** — director → *TAKEDA PHARMACEUTICAL CO LTD*
2. **MIYABASHIRA ASUKA** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **HIGASHI EMIKO** — director → *TAKEDA PHARMACEUTICAL CO LTD*
2. **FURNEY NATALIE ANNE MARIE** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **PACHECO RHONDA JANICE** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **TSUSAKA MIKI** — director → *TAKEDA PHARMACEUTICAL CO LTD*
2. **SHANNON ELAINE MARY** — officer → *TAKEDA PHARMACEUTICAL CO LTD*
2. **MARAGANORE JOHN** — director → *TAKEDA PHARMACEUTICAL CO LTD*
2. **ORSINGER MICHEL BRUNO** — director → *TAKEDA PHARMACEUTICAL CO LTD*
2. **WYATT ELIZABETH H S** — director → *ARIAD PHARMACEUTICALS INC*
2. **BERGER HARVEY J M D** — officer → *ARIAD PHARMACEUTICALS INC*
2. **NELSON PETER** — director → *ARIAD PHARMACEUTICALS INC*
2. **KISHBAUCH MICHAEL D** — director → *ARIAD PHARMACEUTICALS INC*
2. **SOBEL BURTON E** — director → *ARIAD PHARMACEUTICALS INC*
2. **IULIUCCI JOHN D** — officer → *ARIAD PHARMACEUTICALS INC*
2. **SMITH SANDFORD D** — director → *ARIAD PHARMACEUTICALS INC*
2. **TANNER MARY C** — director → *ARIAD PHARMACEUTICALS INC*
2. **BERGER HARVEY J M D** — director → *ARIAD PHARMACEUTICALS INC*
2. **CLACKSON TIMOTHY P** — officer → *ARIAD PHARMACEUTICALS INC*
2. **LAMARCHE JAY R** — director → *ARIAD PHARMACEUTICALS INC*
2. **LAVIDAS ATHANESE** — director → *ARIAD PHARMACEUTICALS INC*
2. **Schlesinger Sarah J.** — director → *ARIAD PHARMACEUTICALS INC*
2. **Bickerstaff George** — director → *ARIAD PHARMACEUTICALS INC*
2. **Haimovitz Jules** — director → *ARIAD PHARMACEUTICALS INC*
2. **Protopapas Anna** — director → *ARIAD PHARMACEUTICALS INC*
2. **BOLLAG DANIEL M** — officer → *ARIAD PHARMACEUTICALS INC*
2. **DENNER ALEXANDER J** — director → *ARIAD PHARMACEUTICALS INC*
2. **SONI MANMEET SINGH** — officer → *ARIAD PHARMACEUTICALS INC*
2. **RIEDEL NORBERT G** — director → *ARIAD PHARMACEUTICALS INC*
2. **COLE HUGH M** — officer → *ARIAD PHARMACEUTICALS INC*
2. **PANAYIOTOPOULOS PARIS** — officer → *ARIAD PHARMACEUTICALS INC*
2. **GANSLER JAYNE M.** — officer → *ARIAD PHARMACEUTICALS INC*
2. **PANAYIOTOPOULOS PARIS** — director → *ARIAD PHARMACEUTICALS INC*
2. **HERRON JENNIFER LYN** — officer → *ARIAD PHARMACEUTICALS INC*
2. **KOGAN ELONA** — officer → *ARIAD PHARMACEUTICALS INC*
2. **HALUSKA FRANK** — officer → *ARIAD PHARMACEUTICALS INC*
2. **CANTOR MARIA E** — officer → *ARIAD PHARMACEUTICALS INC*
2. **RADAELLI MASSIMO** — director → *ARIAD PHARMACEUTICALS INC*
2. **DUVALL MARTIN J** — officer → *ARIAD PHARMACEUTICALS INC*
2. **BERSTEIN DAVID L** — officer → *ARIAD PHARMACEUTICALS INC*
2. **DesRosier Thomas** — officer → *ARIAD PHARMACEUTICALS INC*
2. **WILSON WAYNE** — director → *ARIAD PHARMACEUTICALS INC*
2. **FITZGERALD EDWARD M** — officer → *ARIAD PHARMACEUTICALS INC*
2. **Whelan, Jr. Robert M.** — director → *ARIAD PHARMACEUTICALS INC*
2. **DODION PIERRE F** — officer → *ARIAD PHARMACEUTICALS INC*
2. **KEANE RAYMOND T** — officer → *ARIAD PHARMACEUTICALS INC*
2. **SMYTH A. COLLIER** — director → *ARIAD PHARMACEUTICALS INC*
2. **ROS MATTHEW E** — officer → *ARIAD PHARMACEUTICALS INC*
2. **ALLEN LAURIE A** — officer → *ARIAD PHARMACEUTICALS INC*
2. **PASCOE RICHARD W** — officer → *ARIAD PHARMACEUTICALS INC*
2. **Bedrosian Camille L** — officer → *ARIAD PHARMACEUTICALS INC*

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **THESEUS PHARMACEUTICALS, INC.**. Human view: https://whiteintel.dev/entity/d4fec44b-38d2-5d2c-be50-ac6cbffeae5e · Structured JSON: https://whiteintel.dev/api/public/dossier/d4fec44b-38d2-5d2c-be50-ac6cbffeae5e._

_Risk levels are heuristic investigative leads, not legal determinations of beneficial ownership. Every claim carries a source; an absent edge means "not yet observed in current sources", not "does not exist"._