Banking and Finance
Capital Markets




LLM, King's College London

LLM, Thammasat University

LLB, Thammasat University

Onunya Chanpen
+66 2056 5603


Onunya Chanpen is a senior associate in Tilleke & Gibbins’ corporate and commercial group in Bangkok. A seasoned professional with many years’ experience as an in-house and private practice lawyer, Onunya advises large domestic and multinational companies across industries on critical commercial and transactional matters in Thailand. She specializes in real estate investment trusts (REITs), infrastructure fund projects, public-private partnerships (PPPs), public procurement, and government contracting. In addition to major project-based work, she also supports her clients by advising on general corporate matters and providing corporate secretarial services.

Before joining Tilleke & Gibbins, Onunya worked for another large Thai law firm as well as at a leading asset management company in Thailand, where she gained extensive expertise in capital markets regulations for Thai-listed companies, private equity transactions, as well as in REITs.

Onunya holds an LLB and an LLM from Thammasat University and an LLM in international commercial law from King’s College London. She is a Thai licensed lawyer admitted to the Thai Bar Association and is a licensed notarial services attorney.

  • Assisted numerous asset management companies in setting up and offering units of REITs, infrastructure funds, property funds, and private equity trusts, and advised them on SEC regulations for management of funds/REITs, including mutual funds, property funds, private funds, and provident funds.
  • Advised listed companies on various capital markets and company secretarial matters, including securities offerings, tender offers, information disclosure, corporate governance, and AGM/EGM arrangement.
  • Assisted and represented potential investors engaging in PPP projects and public procurement projects in Thailand, advising on all associated legal matters from initial project bidding to contract negotiations and contract management.
  • Retained as a PPP and public procurement project advisor to various government agencies, advising on a full range of matters including the business case process, preparing RFP/bidding terms and conditions, the bidding selection process, contract negotiation, and contract management for ongoing projects.