Keith Flaum

Keith Flaum

Silicon Valley

Email [email protected]​

Phone +1 650 463 4084

Fax +1 650 463 4199

Practice groupCorporate & Finance

"Keith is by far the best M&A lawyer with whom I have ever worked. He really understands my business and provides invaluable advice."

Chambers USA

Keith Flaum is a leading M&A lawyer with more than 30 years of experience representing publicly traded and privately held companies in domestic and cross-border merger and acquisition transactions and complex joint ventures, with a particular emphasis on representing information technology and life sciences companies.  He is a trusted adviser to boards of directors and special committees in the M&A context. Keith serves as the firm’s Co-Head of M&A for the Americas and a member of the firm’s Global M&A Leadership Team.

Keith's recent experience includes more than US$100 billion of M&A activity for some of the world's top technology companies, handling groundbreaking deals throughout the United States, Europe, Asia, the Middle East, and elsewhere.

Legal guides consistently recognize Keith as one of the top legal minds in M&A. Chambers USA ranks him in their highest tier, Band 1, for California Corporate/M&A. In 2021, Who's Who Legal named Keith as one of seven M&A Global Elite Thought Leaders in the U.S. and the Daily Journal named him one of the top 100 lawyers in California. In 2019, the LMG Life Sciences Guide deemed him a "Life Sciences Star." In 2016, The National Law Journal named him a "Trailblazer" in M&A. Law360 has recognized him as both a "Technology MVP" and "M&A MVP."

Keith has been actively involved for more than 15 years in the M&A Committee of the ABA's Section of Business Law, including as Vice Chair of the Committee, Chair of the Market Trends Subcommittee, Co-Chair of the International M&A Subcommittee, and a member of the Subcommittee on Acquisitions of Public Companies.

Awards and recognitions


Corporate/M&A (Northern California)
Chambers USA


M&A/Corporate and Commercial: M&A: Large Deals ($1bn+), Leading Lawyer
Legal 500 US


Corporate Governance
Who's Who Legal


Leading Life Sciences Lawyer
LMG Life Sciences


Legends of the 500


Mergers and Acquisitions Law
Best Lawyers in America


Corporate M&A (International & Cross-Border) (USA)
Chambers Global

2015, 2019-2020

Top 100 Lawyers in California
Daily Journal


Acritas Star
Acritas Stars Independently Rated Lawyers


M&A, Highly Regarded


Technology and Telecommunications, Highly Regarded

2016, 2018-2019

Life Science Star
LMG Life Sciences Guide


Healthcare: Life Sciences
Legal 500 US


Trailblazer in M&A
The National Law Journal

2013, 2015-2016

Technology MVP



Education and admissions


J.D., University of California, Davis School of Law, 1989

B.A., University of California, Los Angeles, 1986

Bar admissions and qualifications


Representative experience

Facebook's US$16bn acquisition of WhatsApp.*

The Anschutz Corporation in respect of the US$5.8bn acquisition of Regal Entertainment Group by Cineworld Group plc.

Zendesk on its pending acquisition of Momentive in a stock-for-stock transaction with a reported value in excess of US$4bn.

Wise Road Capital in its pending US$1.4bn acquisition of Magnachip Semiconductor.

Autodesk in its pending US$1bn acquisition of Innovyze.

Jazz Pharmaceuticals' US$1bn acquisition of Gentium S.p.A.*

Merz Pharma on its acquisitions of BioForm, Ulthera, OnLight Sciences, Neocutis, and the sale of its medical dermatology business to Sebela Pharmaceuticals.*

Oracle's acquisitions of NetSuite, MICROS Systems, Taleo Corporation, Acme Packet, Inc., Aconex Limited, Eloqua Inc., Textura Corporation, and Opower, Inc. for >US$20bn.*

Reid Hoffman, founder and controlling stockholder of LinkedIn, in LinkedIn's acquisition by Microsoft for US$26.2bn.*

Chewy, Inc. in its US$3.3bn sale to PetSmart in what is reported to be the largest e-commerce deal ever.*

Varian Medical/Varex Imaging Corporation on its purchase of PerkinElmer’s medical imaging business for US$276m.*

XenoPort on its US$446.6m sale to Arbor Pharmaceuticals.*

zulily, inc. in its US$2.4bn sale to Liberty Interactive Corporation.*

Applied Materials' acquisitions of Kokusai Electric Corporation (US$3.5bn) (terminated) and Varian Semiconductor Equipment (US$4.9bn),* and its merger with Tokyo Electron (US$29bn) (terminated).

Illumina's successful defense of Roche's US$6.2bn hostile takeover attempt.*

Rosetta Stone on its US$792m sale to Cambium Learning Group.

eBay's acquisitions of GSI Commerce for approximately US$2.4bn, GittiGidiyor (Turkey), and Brands4Friends (Germany).*

eBay's sale of a majority interest in Skype for US$1.9bn and its enterprise business to Sterling Partners and Permira for US$925m.*

RF Micro Devices' US$1.6bn merger of equals with TriQuint Semiconductor.*

Riverbed Technology's acquisition of OPNET Technologies for US$1bn, as well as acquisitions of Zeus Technology in the United Kingdom and Aptimze in New Zealand.*

Opera Software in acquisitions of companies in Brazil, Turkey, Canada, Argentina, and numerous acquisitions in the United States.*

PayPal in its joint venture with SOFTBANK relating to online payment technology in Japan.


Zynga in its joint venture with SOFTBANK relating to online gaming in Japan and its acquisition of Unoh in Japan.


*Matter handled prior to joining Hogan Lovells.

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