Simin Sun


Education and Clerkships

J.D., University of Pennsylvania Law School, 2011, Asian Pacific American Law School Students Association; East Asia Law Review, Associate Editor; Constitutional Law Review, Associate Editor

B.B.A., Corporate Finance and Business Honors Program, University of Texas at Austin, 2008

Judicial Intern, The Honorable Judge Lee H. Rosenthal, U.S. District Court for the Southern District of Texas, Summer 2009


Texas, 2011


Chinese (Mandarin)


Simin Sun is an innovative problem solver with a reputation for providing high quality legal services and finding creative solutions to resolving difficult problems.

Simin’s practice is primarily focused on mergers and acquisitions, cross border transactions, technology-based transactions, corporate securities and general corporate matters. He assists clients in connection with complex mergers and acquisitions (both on the buyer and seller side), especially those that contain a technology or international component and corporate securities matters, especially those that involve capital raises through public or private equity or debt. He has represented clients in transactions in a number of jurisdictions, including, US, China, Japan, Canada, Ireland, Norway, Turkey, Oman, Gabon, Cayman Islands, the British Virgin Islands and many more. Whether the client is a public or private company focused on energy, biotechnology, software, chemical manufacturing, or distribution, Simin is able to provide insightful legal advice to help a transaction reach a satisfactory conclusion for his clients.

Simin is also an Ambassador for the Houston Bar Association. He is a member of the Houston Association for Corporate Growth and volunteers at The Center Houston, a non-profit that specializes in improving the lives of adults with intellectual and developmental disabilities.

Selected Publications

  • "Sign & Consent: A Review of Customary Deal Terms in an Openlane Transaction" HBA Seminars Series, October 20, 2017
  • "Damages Limitations in NDAs and Confidentiality Agreements," co-author with Debra Hatter, January 2012.


Oil and Gas

Haynes and Boone Helps Alta Mesa Close $3.8 Billion Merger

A team of Haynes and Boone lawyers advised Alta Mesa Holdings, LP, which on February 9 completed its $3.8 billion combination with Silver Run Acquisition Corporation II and Kingfisher Midstream LLC.

Mergers and Acquisitions

Human resources

Haynes and Boone Advises KMG in $495 Million Acquisition

Haynes and Boone, LLP Partner Bill Nelson led a team of lawyers who represented client KMG Chemicals Inc. in its acquisition of Flowchem, a leading manufacturer of pipeline performance products, from Arsenal Capital Partners. Haynes and Boone also advised KMG on the related financing of the transaction.

Selected Client Representations

  • WuXi Pharmatech in its $65 million acquisition from NextCode Health named Best US Technology Deal of 2015 by Acquisition International.
  • Nabors Industries in its acquisition of Robotic Drilling Services AS.
  • A large independent energy retailer in a private merger to form one of the largest independent energy retailers in Canada.
  • Investment by a subsidiary of a Chinese state-owned entity in an osmosis technology company.
  • Roll-over of a U.S. minority-owned business in camera distribution to a private equity buyer.
  • NYSE-listed company in establishing a manufacturing business in Japan. 

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