Kenneth Krisko

Partner
Full contact info

I work closely with my clients to understand their business and strategic objectives and to structure and negotiate transactions to meet those objectives.

Experience

Philochem AG Announces up to $1.35 Billion License Agreement With RayzeBio

June 10, 2025

Cooley advised Philochem AG, a wholly owned subsidiary of the Philogen Group (Milan Stock Exchange: PHIL), on its definitive license agreement with RayzeBio, a wholly owned subsidiary of Bristol Myers Squibb (NYSE: BMY), granting RayzeBio exclusive worldwide rights to develop, manufacture and commercialize OncoACP3, a clinical-stage therapeutic and diagnostic agent targeting prostate cancer.

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Kenneth Krisko
Partner, Reston
Joe Sandys
Special Counsel, London
Alexandra Paterson
Associate, London
Joseph Perry
Associate, Reston
J. Brian Stalter
Special Counsel, New York
Aaron Pomeroy
Partner, Colorado
Amanda Pacheco
Associate, Palo Alto
David Burns
Special Counsel, Washington, DC
Megan Browdie
Partner, Washington, DC
Natasha Leskovsek
Of Counsel, Washington, DC
Ann Bevitt
Partner, London
Rachel Thorn
Of counsel, New York
Dr. Jon Cousin
Partner, Washington, DC

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BioNTech Announces Global Collaboration Agreement With Bristol Myers Squibb

June 3, 2025

Cooley advised BioNTech SE, a global biotechnology company pioneering next-generation immunotherapies, on its global co-development and co-commercialization collaboration agreement with Bristol Myers Squibb for BioNTech’s antibody candidate BNT327. The transaction includes a $1.5 billion upfront payment and $2 billion total in noncontingent anniversary payments through 2028.

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Kenneth Krisko
Partner, Reston
J. Brian Stalter
Special Counsel, New York
John Forrest
Associate, Boston
Arda Can Tekin
Associate, New York
Megan Browdie
Partner, Washington, DC
David Burns
Special Counsel, Washington, DC
Jonas Koponen
Partner, Brussels
Rachel Thorn
Of counsel, New York
Eric Blanchard
Partner, Boston
Christopher Kimball
Partner, Washington, DC
Joe Sandys
Special Counsel, London
Natasha Leskovsek
Of Counsel, Washington, DC
Navya Dasari
Associate, New York
Douglas Lyles
Senior Research Services & Access Analyst

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Araris Biotech’s up to $1.14 Billion Acquisition by Taiho Pharmaceutical

March 17, 2025

Cooley advised Araris Biotech, a Swiss biotechnology company developing next-generation antibody-drug conjugates, on its definitive agreement to be acquired by Japan-based Taiho Pharmaceutical for up to $1.14 billion in cash.

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Bill Roegge
Partner, New York
Kenneth Krisko
Partner, Reston
Simon Amies
Partner, London
Rita Sobral
Special Counsel, London
Stephanie Parker Palmer
Special Counsel, Reston
Michael Bergmann
Partner, Washington, DC
Brandon W. Fenn
Partner, New York
Eileen Marshall
Partner, Washington, DC
Jeremy Morrison
Partner, Washington, DC
Stella Sarma
Partner, Brussels
Ryan Vann
Partner, Chicago
Natasha Leskovsek
Of Counsel, Washington, DC
Matthew Choy
Associate, New York
Kyle Hess
Associate, New York
Katie Kaufman
Associate, Boston
Edward (Teddy) Nimetz
Associate, New York
Alexandra Paterson
Associate, London
Joseph Perry
Associate, Reston

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Poseida Therapeutics Announces Agreement to Be Acquired by Roche for up to $1.5 Billion

November 26, 2024

Cooley advised Poseida Therapeutics, a clinical-stage allogeneic cell therapy and genetic medicines company advancing differentiated nonviral treatments for patients with cancer, autoimmune and rare diseases, on its merger agreement to be acquired by Roche at a price of $9 per share in cash at closing, plus a non-tradable contingent value right to receive up to an aggregate of $4 per share in cash, payable upon achievement of specified milestones. The price payable at closing represents a total equity value of up to $1.5 billion and a premium of approximately 215% to Poseida’s closing share price on November 25, 2024. Cooley previously represented Poseida in its initial public offering, equity and debt transactions, and collaboration agreements, including its collaboration agreement with Roche.

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Rowook Park
Partner, San Diego
Barbara Borden
Senior Counsel, San Diego
Julia Kim
Special Counsel, New York
Rajdeep Roger Bains
Associate, San Diego
Josh Himmelstern
Associate, San Diego
Elaine Huang
Associate, Palo Alto
Anne Luquette
Associate, San Francisco
Allie Pilmer
Associate, San Diego
Tom Coll
Partner, San Diego
Kenneth Krisko
Partner, Reston
Edmond Lay
Partner, San Diego
John Forrest
Associate, Boston
Jenny Ge
Associate, Santa Monica
Peter Adams
Partner, San Diego
Michael Bergmann
Partner, Washington, DC
Megan Browdie
Partner, Washington, DC
Ross Eberly
Partner, Santa Monica
Todd Gluth
Partner, San Diego
Christopher Kimball
Partner, Washington, DC
Alessandra Murata
Partner, Palo Alto
Jeffrey J. Tolin
Partner, New York
Robert Eisenbach
Of Counsel, San Francisco
Maricel Mojares-Moore
Special Counsel, San Francisco
Dillon Martinson
Special Counsel, Washington, DC
Stella Sarma
Partner, Brussels
Natasha Leskovsek
Of Counsel, Washington, DC
Alexandria Ashour
Associate, San Diego
Navya Dasari
Associate, New York
Sara Kim
Associate, Los Angeles
Nicollette R. Kirby
Associate, Washington, DC
Allison Kutner
Associate, New York
Calvin Lee
Associate, New York
Calvin Lee
Associate, New York
Breanna Qin
Associate, Palo Alto
Shelby Saunders
Associate, New York
Shaun (Tianjie) Wang
Associate, New York
Colleen R. Wellington-Caban
Associate, Washington, DC
Jack Whitaker
Associate, San Diego
Anna Anderson
Paralegal Specialist, London
Novak Topalovic
Associate, San Diego

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Aclaris Therapeutics Announces Global License Agreement With Biosion, $80 Million Private Placement

November 18, 2024

Cooley advised Aclaris Therapeutics (Nasdaq: ACRS), a clinical-stage biopharmaceutical company developing novel drug candidates for immuno-inflammatory diseases, on its exclusive license agreement with Biosion and $80 million private placement.

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Related contacts

Mark Ballantyne
Partner, Reston
Kenneth Krisko
Partner, Reston
Brian Leaf
Partner, Reston
J. Brian Stalter
Special Counsel, New York
Ruomu Li
Partner, Shanghai
David Brinton
Associate, Washington, DC
Arjan Ganji
Associate, Washington, DC
Natasha Leskovsek
Of Counsel, Washington, DC
Daniel I. Goldberg
Partner, New York
Christopher Kimball
Partner, Washington, DC
Aaron Pomeroy
Partner, Colorado
Francis Wheeler
Senior Counsel, Colorado
Rebecca Ross
Special Counsel, Washington, DC
John Forrest
Associate, Boston
Zack Gong
Associate, Shanghai
Michael Shen
Special Counsel, Shanghai
Robin K. Lee
Paralegal Specialist, Colorado

Related Practices & Industries

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Admissions and credentials

District of Columbia

Virginia

Rankings and accolades

Legal 500: Key Lawyer – Healthcare: Life Sciences (2021)

Memberships and affiliations

American Bar Association (ABA)