Nathan Seiler

Nathan E. Seiler

Partner He / Him / His

Nathan E. Seiler is the Chair of Ballard Spahr's Business and Transactions Department, former Managing Partner of Ballard Spahr's Boulder office, a Practice Leader of the Emerging Companies and Venture Capital Group, and a member of the firm's Senior Leadership Team. 

Nathan advises high-growth companies on corporate and securities transactions, including initial formation, venture capital and private equity financings, mergers and acquisitions, public and private securities offerings, securities law disclosure and compliance, and general corporate counseling. He works with clients in a variety of industries, including software, biotechnology, medical device, information technology, telecommunications, natural and organic products, clean technologies, and renewable energy.


Representative Matters

  • Represented public and private companies in more than 100 M&A transactions ranging in size from less than $10 million to more than $1 billion, including mergers, tender offers, exchange offers and stock and asset sales
  • Represented emerging growth companies and venture capital and private equity investors in hundreds of financing transactions ranging in size from seed rounds of less than $1 million to late stage financings exceeding $100 million
  • Represented issuers and selling stockholders in public offerings totaling more than $500 million
  • Represent public companies in SEC compliance and reporting obligations

Professional Highlights

Professional Activities

American Bar Association

Colorado Bar Association

Colorado BioScience Association

Recognition & Accomplishments

Chambers USA, Corporate/M&A (Colorado), 2023, 2024

Legal 500, Real Estate - Real Estate Investment Trusts (REITs), 2023

Leadership Boulder County Program 2009

Board Memberships & Community Service

Director, Impact on Education, 2019-present

Former Director, Colorado Cleantech Industries Association Foundation, Inc., 2012-2014

Former Director, Temple Grandin School, 2011-2014



Northwestern University School of Law (J.D., cum laude, 2000)
Order of the Coif
Articles Editor, Northwestern University Law Review

University of Nebraska-Lincoln (B.A. 1997, with honors)
Phi Beta Kappa
University of Nebraska Regents Scholar