Chris Stack

Partner
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I’m passionate about finding pragmatic and commercial solutions to businesses’ employment issues both in the UK and internationally.

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Experience

EsoBiotec Announces up to $1 Billion Acquisition by AstraZeneca

March 17, 2025

Cooley advised EsoBiotec, a biotechnology company pioneering in vivo cell therapies that has demonstrated promising early clinical activity, on its definitive agreement to be acquired by AstraZeneca (London Stock Exchange/Nasdaq Stockholm/Nasdaq: AZN) for up to $1 billion on a cash- and debt-free basis.

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Ross Eberly
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Christopher Kimball
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Charlie Lightfoot
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Alessandra Murata
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Dr. Matthew Pavao
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Guadalupe Sampedro
Partner, London
Stella Sarma
Partner, Brussels
Leo Spicer-Phelps
Partner, London
Nicola Squire
Partner, London
Chris Stack
Partner, London
Jeffrey J. Tolin
Partner, New York
David Wilson
Partner, London
Julia R. Brinton
Special Counsel, Washington, DC
Andrew Epstein
Special Counsel, Seattle
Jack Jones
Special Counsel, London
Dillon Martinson
Special Counsel, Washington, DC
Karen Tsai
Special Counsel, Washington, DC
Julie Wicklund
Special Counsel, Palo Alto
Natasha Leskovsek
Of Counsel, Washington, DC
Kafeel Azher
Associate, London
Sarah Buchik
Associate, New York
Dr. Jessica Cande
Associate, Boston
Mari Dugas
Associate, Washington, DC
Michael Fernando
Associate, London
Athina Gaki
Associate, Brussels
Elaine Huang
Associate, Palo Alto
Mark Jones
Associate, London
Eerik Kukebal
Associate, London
Chris Lynn
Associate, London
Morgan McCormack
Associate, London
Daniel Millard
Associate, London
Lindsey O'Crump
Associate, Washington, DC
Alexandra Paterson
Associate, London
Dr. Robert E. Powers
Associate, Boston
Zhijing Yu
Associate, Singapore
Kevin Gurley
Quantitative Analyst, New York

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UiPath Acquires Peak

March 12, 2025

Cooley advised UiPath (NYSE: PATH), a leading enterprise automation and artificial intelligence (AI) software company, on its acquisition of Peak, an AI-native company based in Manchester, United Kingdom.

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Russell Anderson
Partner, London
Kevin Cooper
Partner, New York
Caroline Hobson
Partner, London
Aaron Pomeroy
Partner, Colorado
Leo Spicer-Phelps
Partner, London
Nicola Squire
Partner, London
Chris Stack
Partner, London
David Wilson
Partner, London
Christine Graham
Special Counsel, London
Rebecca Ross
Special Counsel, Washington, DC
Olivia Anderson
Associate, London
Neelam Atwal
Associate, London
Harry Calkin
Associate, London
Harry Calkin
Associate, London
Cristina DeBiase
Associate, Boston
Rick Jantz
Associate, Santa Monica
Chris Lynn
Associate, London
Daniel Millard
Associate, London
Juan Nascimbene
Associate, London
Mo Swart
Associate, London
Dominic Taylor
Associate, London

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PetLab Co. Announces Majority Stake Sale to BC Partners

February 26, 2025

Cooley advised PetLab Co., a rapidly growing independent pet supplement brand headquartered in London, on its majority stake sale to BC Partners, a top international investment firm.

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Ben Shribman
Partner, London
Kevin Cooper
Partner, New York
Louise Burt
Associate, London
David Wilson
Partner, London
Eerik Kukebal
Associate, London
Aaron Pomeroy
Partner, Colorado
Paula Holland
Partner, London
Harry Calkin
Associate, London
Rick Jantz
Associate, Santa Monica
Jia Xie
Associate, London
Patrick Flanagan
Partner, New York
Paula Fleckenstein
Associate, Reston
David Walsh
Senior Counsel, Reston
Chris Coulter
Partner, London
María Álvarez Requejo Heredero
Associate, Brussels
Megan Browdie
Partner, Washington, DC
Caroline Hobson
Partner, London
Colm Murphy
Partner, London
Gerard O'Shea
Partner, New York
Lauren A. Reichardt
Partner, New York
Guadalupe Sampedro
Partner, London
Stella Sarma
Partner, Brussels
Leo Spicer-Phelps
Partner, London
Nicola Squire
Partner, London
Chris Stack
Partner, London
Henry Stewart
Partner, London
Michael Tollini
Partner, Washington, DC
Karun Ahuja
Special Counsel, Chicago
Sharon Connaughton
Special Counsel, Washington, DC
Christine Graham
Special Counsel, London
Jack Jones
Special Counsel, London
Cristina DeBiase
Associate, Boston
Athina Gaki
Associate, Brussels
Gary Warren Hunt III
Associate, Washington, DC
Danielle Joe
Associate, Washington, DC
Alexandra Leavy
Associate, New York
Daniel Millard
Associate, London
Megan Mojabi (Flynn)
Associate, London
Breanna Qin
Associate, Palo Alto
Alice Wong
Associate, London
Steven A. Zuckerman
Associate, New York
Margie Murphy
Paralegal Specialist, New York
Jake Ironfield
Transactional Quantitative Analyst, New York
Kafeel Azher
Associate, London

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Tenable to Acquire Vulcan Cyber

January 29, 2025

Cooley advised Tenable Holdings (Nasdaq: TENB), the exposure management company exposing and closing the cybersecurity gaps that erode business value, on its definitive agreement to acquire Vulcan Cyber, an innovator in exposure management, for $150 million in enterprise value.

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Bill Roegge
Partner, New York
Meredith Klionsky
Special Counsel, Washington, DC
Katie Benvenuti
Associate, New York
Mike Lincoln
Vice Chair, Reston
Yvan-Claude Pierre
Partner, New York
Ariane A. Andrade
Partner, Chicago
Caroline Hobson
Partner, London
Len Jacoby
Partner, New York
Eileen Marshall
Partner, Washington, DC
Jeremy Morrison
Partner, Washington, DC
Leo Spicer-Phelps
Partner, London
Chris Stack
Partner, London
Christine Graham
Special Counsel, London
Rebecca Ross
Special Counsel, Washington, DC
Stella Sarma
Partner, Brussels
Karen Tsai
Special Counsel, Washington, DC
Julie Wicklund
Special Counsel, Palo Alto
Olivia Anderson
Associate, London
Kafeel Azher
Associate, London
Danielle Crinnion
Associate, Boston
Sharon Davidov
Associate, New York
Megan Drill
Associate, San Diego
Athina Gaki
Associate, Brussels
Michael Gladstone
Associate, New York
Eileen Leman
Associate, Los Angeles
Anisha Mohin
Associate, New York
Shelby Saunders
Associate, New York
Patricia Myers
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Brandon Lefebvre
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Battery Ventures Announces Majority Growth Investment in QSR Automations

December 11, 2024

Cooley advised Battery Ventures, a global, technology-focused investment firm, on its strategic, majority growth investment in QSR Automations, a global leader in restaurant technology.

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Alfred Browne
Partner, Boston
David Silverman
Partner, New York
Megan Browdie
Partner, Washington, DC
Thomas Connors
Partner, Boston
Christine Graham
Special Counsel, London
Ben Shribman
Partner, London
Peter Crain
Special Counsel, Reston
Chris Stack
Partner, London
Heather Harrington
Special Counsel, Boston
Ryan Montgomery
Partner, Boston
Stella Sarma
Partner, Brussels
Grant Schweikert
Special Counsel, Washington, DC
Karen Tsai
Special Counsel, Washington, DC
William Corcoran
Of Counsel, Boston
William Corcoran
Of Counsel, Boston
Karun Ahuja
Special Counsel, Chicago
Connor Breed
Associate, Reston
Sarah Buchik
Associate, New York
Bethan Chalmers
Associate, London
Umer Chaudhry
Associate, Washington, DC
Umer Chaudhry
Associate, Washington, DC
Juliana Finley
Associate, Santa Monica
Jimmy Gilligan
Associate, Boston
Rick Jantz
Associate, Santa Monica
Patrick Johnson
Director of Marketing – Litigation, Chicago
Nicollette R. Kirby
Associate, Washington, DC
Calvin Lee
Associate, New York
Arthi Naini
Associate, New York
Mo Swart
Associate, London
Leanne Andrepont
Senior Trademark Paralegal
Chris Rhem
Paralegal Specialist, San Francisco
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Admissions and credentials

England and Wales

Rankings and accolades

Chambers & Partners (UK): Up & Coming - Employment (2022)

The Legal 500 UK: Employers (2022)

He is clearly a top subject-matter expert in his field but what sets him apart is his ability to deliver pragmatic and commercial advice.

Legal 500