X YEARSTENTH-ANNIVERSARY
A Quarterly Record · Established 2016
Taiho Pharmaceutical
Parent Imprint · Tokyo

Taiho Ventures

A Quarterly Record of the Firm

PARTLY CLEAR · WEST WIND · 64°VOL. X · NO. 1 · MENLO PARK · MAY 2026TWO COLOURS · LETTERPRESS · ONE THOUSAND COPIES
TENTH-ANNIVERSARY EDITION · LEDE

After Ten Years

The firm marks a decade of strategic investing, and a portfolio that ran the full loop from licensed molecule to acquired clinical asset.

Twenty-three companies; eleven syndicate seats with ARCH, GV, or Polaris; one full build-to-buy. The work, mostly, is more ordinary than the headlines.

MENLO PARK — MAY 2026 · By the Editors
Three founding partners on Sand Hill Road, May 2016, the day the firm was capitalized.FILED · MAY 2016
The three founding partners on Sand Hill Road, May 2016, the day the firm was capitalized. Photograph by the Editors, on file.

In the spring of 2016, three people sat in a windowless room above a parking lot in Menlo Park and tried to write down what the firm was for. The page they produced is not interesting. The work that followed it is.

Taiho Ventures was founded as the strategic investing arm of Taiho Pharmaceutical, a Japanese mid-cap oncology house with a hundred-year history of small-molecule chemistry. The firm was given a checkbook, a brief, and very few rules. The brief, in plain words, was to find the medicines that Taiho would not have found on its own — and, where the science warranted it, to bring them home.

Ten years on, the record is mixed in the way an honest record is. There are twenty-three portfolio companies. There are eleven syndicate seats taken alongside ARCH, GV, and Polaris. There is one company — Cullinan Pearl, founded in 2017 around an EGFR inhibitor licensed out of Taiho Pharmaceutical — that was acquired back into the parent in 2023, after the asset cleared its proof-of-concept readouts. This is what the firm calls a build-to-buy. The phrase is plainer than the work.

Most of the work, however, is more ordinary. A board observer chair. A quarterly check-in with a founder who is two clinical readouts away from knowing whether the molecule holds. A conviction, slowly assembled across four years, that a target the rest of the table walked away from is the right target.

This issue is a record of the decade, written in the firm's own voice, set in the form the firm prefers: plainly, on paper, in columns.

THE PRACTICE · THE FILINGS
CASE OF RECORD · COMPANY NO. 4

Cullinan Pearl, Bought Back

A 2017 spinout around an EGFR inhibitor licensed out of Taiho Pharmaceutical was re-acquired by the parent six years later, after the asset cleared its first proof-of-concept readouts.

CAMBRIDGE, MASS. — JAN. 2023
The founding team of Cullinan Pearl in a Cambridge office, June 2017.FILED · 2017
The Cullinan Pearl founding team in Cambridge, June 2017. The molecule was at the centre of the table.

In 2017, Taiho Ventures co-founded Cullinan Pearl with a small group of operators in Cambridge. The company had one asset, an EGFR inhibitor licensed out of Taiho Pharmaceutical's own pipeline, and a thesis about how to develop it for patients in the United States.

Six years later, Taiho Pharmaceutical bought the company back. The asset is now in late-stage trials. The science was not novel; the development path was. The firm believes, on the evidence, that this is what strategic capital is for.

The deal is the case the firm points to most often, because it ran the full loop. There are others. Most of them have not yet finished running.

See the practice column, this page →
THE PRACTICE

What the Firm Calls Build-to-Buy

A note on the mechanic that produced Cullinan Pearl, and the mechanic that has not yet produced anything else.

MENLO PARK — A STANDING COLUMN

A build-to-buy is, in plain words, a deliberate act. The firm co-founds a company around an asset that the parent has reason to want back. The company is run under venture discipline by independent operators. The parent waits.

If the science holds, the parent re-acquires the asset on terms negotiated at arm's length. If the science does not hold, the venture syndicate exits, and the parent has paid a fraction of what an internal program would have cost.

The mechanic has run to completion once. Two further build-to-buys are presently in train; neither has cleared its second clinical readout, and the firm will not name them in this edition.

"The phrase is plainer than the work."
SYNDICATE SEATS

Eleven Boards, Mostly Quiet

VARIOUS — 2017–2026

Of the twenty-three companies in the portfolio, the firm holds an observer or board seat in eleven. Most are alongside ARCH Venture Partners, GV, or Polaris Partners. The firm does not lead rounds.

A board observer seat, properly used, is mostly listening. The firm has chosen to use its seats this way.

Recent Filings
  • APR. 2026Series B participation, undisclosed Cambridge oncology company.
  • FEB. 2026Board observer seat taken, second build-to-buy.
  • NOV. 2025Cullinan Oncology Phase 3 readout for CLN-081.
  • AUG. 2025Series A lead participation, GI metabolic disease.
WHAT THE FIRM HAS FILED · 2024–2026
The medicinal-chemistry bench at Cullinan Pearl, autumn 2018.FILED · 2018
The medicinal-chemistry bench at Cullinan Pearl, autumn 2018. Bench-work for the EGFR programme that became CLN-081. Photograph on file.
FILINGS · A STANDING COLUMN

What the Firm Has Filed

A dated record of the firm's investments and exits, in plain order, with co-investors named where named publicly.

  • APR. 2026
    Series B participation, undisclosed Cambridge oncology company.
    Co-investors: ARCH, Polaris.
  • FEB. 2026
    Board observer seat taken, second build-to-buy.
    Asset and co-founders not yet disclosable.
  • NOV. 2025
    Cullinan Oncology Phase 3 readout for CLN-081.
    Public; trial is registered and the data is on file.
  • AUG. 2025
    Series A lead participation, GI metabolic disease.
    Co-investors: GV, Sofinnova.
  • MAY 2025
    Exit: Public Co. acquisition of portfolio holding.
    Disclosed in 8-K dated 2025-05-13.
  • FEB. 2025
    Series B observer seat, antibody-drug conjugate platform.
    Co-investors: ARCH, Lilly Ventures.
  • OCT. 2024
    Filed: registration statement for IPO of Cullinan Oncology.
    Underwriter: Goldman Sachs. Public.
  • JUNE 2024
    Founding co-investor, third build-to-buy initiated.
    Asset disclosable in 2026 Q3 edition.
FROM THE PARTNERS
"Most of the work, however, is more ordinary."

The firm holds a board observer or director seat in eleven companies. Most of those companies will not produce a press release this quarter. Most of those seats will be a phone call, a memo read, a follow-up question. We think this is the work.

We do not lead rounds. We will not start. We will pay attention.

— M. Tanaka, K. Abrams,
S. Patel, Partners
ON THE SYNDICATE · ON THE ROSTER
CO-INVESTORS · MENTIONED IN FILINGS

The Syndicate

ARCH Venture PartnersGVPolaris PartnersSofinnovaLilly VenturesPfizer VenturesBristol Myers Squibb CapitalOrbiMedAtlas VentureThird Rock VenturesForesite CapitalAndreessen Horowitz Bio + Health

COMPANIES · STANDING IN PORTFOLIO

The Roster, Alphabetical

  • Cullinan Oncology, Inc.
  • Replimune Group, plc.
  • Sutro Biopharma, Inc.
  • Frequency Therapeutics, Inc.
  • Kymera Therapeutics, Inc.
  • Werewolf Therapeutics, Inc.
  • Nuvation Bio, Inc.
  • Abata Therapeutics, Inc.
  • Alkeus Pharmaceuticals, Inc.
  • Cardea Bio, Inc.
  • Pyramid Biosciences, Inc.
  • — and twelve further holdings, on file
LETTERS · SUBMISSIONS
— SUBMISSIONS · LETTERS TO THE FIRM —

A Note to Founders

The firm reads cold submissions. We will not pretend the rate of reply is high; the partners are three, and the load is what it is. We will say plainly what works.

A two-page note, written in plain English, that says what the molecule is, what it is for, what has been done, and what would be done with our capital. No deck on first contact. No NDA on first contact. The fastest way to a meeting is a paragraph that names the target.

Or write to: submissions@taihoventures.com