Katharine Moir, Global Chair of the firm's Tax Department, advises leading private equity firms and companies on tax issues arising in their largest and most complex transactions.

Ms. Moir provides comprehensive tax counsel in connection with a range of domestic and international transactions and is widely recognized as a leading private equity tax lawyer. Her work includes advising on tax issues related to complicated US and international transactions, including:

  • Mergers and acquisitions
  • Joint ventures
  • Recapitalizations
  • Structured investments
  • Formation of private equity funds
  • Securities offerings

Ms. Moir regularly represents leading private equity firms, as well as top technology and other companies. Her experience spans a number of landmark and high-value deals — including advising Dell in the largest technology deal to date.

Prior to joining Latham, Ms. Moir served as a tax partner and head of the West Coast tax practice at a leading international law firm.

Ms. Moir’s experience includes advising:

  • Skillz in its US$150 million acquisition of Aarki
  • Okta in its US$6.5 billion acquisition of Auth0
  • Dell in its US$67 billion acquisition of EMC, the largest technology deal to date*
  • Hellman & Friedman in its US$1.2 billion acquisition of Checkmarx, an Israeli private company*
  • KKR in its US$2.2 billion acquisition of international operations from Campbell Soup Company*
  • Hellman & Friedman in its US$11 billion acquisition of Ultimate Software*
  • Calsonic Kansei (KKR portfolio company) in its US$7.1 billion acquisition of Magneti Marelli*
  • Silver Lake Partners in its US$3.5 billion acquisition of Blackhawk Networks*
  • Silver Lake Partners in its US$1.5 billion acquisition of First Advantage*
  • Hellman & Friedman in its acquisition of MultiPlan*
  • Silver Lake Partners and GIC in their US$2.6 billion strategic investment in Ancestry.com*
  • KKR in its US$1.2 billion sale of Alliance Tire Group to Yokohama Rubber*
  • Alibaba Group in its private acquisition of Youku Tudou*
  • Interactive Data Corporation in its US$5.2 billion acquisition by Intercontinental Exchange*
  • Microsoft Corporation in its US$19.75 billion debt offering*
  • Silver Lake in the establishment of Silver Lake Partners IV, L.P., with US$10.3 billion in total commitments, the largest amount ever raised for a technology investment-focused private equity fund*

*Matter handled prior to joining Latham

Bar Qualification

  • California


  • JD, University of Chicago Law School, 1996
  • AB, Princeton University, 1992


Moir, Katharine
October 26, 2023 Recognition

Tax MVP: Latham’s Katharine Moir

Global Chair of the Transactional Tax Practice honored for advising industry-leading clients on the tax aspects of recent M&A transactions, often involving multiple stakeholders and complex tax-related carve-out issues.