Tierney O'Rourke
Advises U.S. and international clients on a range of private and public M&A transactions, as well as securities offerings and corporate matters.
Tierney advises U.S. and international clients on a range of private and public M&A transactions, including cross-border transactions. Her M&A experience includes mergers, securities acquisitions, carve-outs, majority and minority investments, joint ventures and activism defense.
She also advises clients on securities and corporate matters, including debt and equity offerings, public company reporting and corporate governance. Her capital markets practice includes representation of both issuers and underwriters.
Tierney’s practice spans a range of industries, with a particular focus on the technology, fintech, life sciences and financial services sectors.
Experience highlights
Mergers & Acquisitions
- HP’s $3.3 billion acquisition of Poly
- Gilead Sciences’ $405 million acquisition of MiroBio
- Truist’s sale of Sterling Capital Management to Guardian Capital
- Mirion’s $2.6 billion combination with GS Acquisition Holdings Corp II, a SPAC
- Goldman Sachs Merchant Banking Division’s $500 million investment in InhabitIQ
- Equinix’s $335 million acquisition of Packet Host
- SS&C Technologies’ $120 million acquisition of Innovest Systems
- Immedica Pharma’s acquisition of pegzilarginase assets from Aeglea
- Upgrade’s $100 million acquisition of Uplift
- CrowdStrike’s acquisition of SecureCircle
- Arcade Beauty’s out-of-court restructuring
Capital Markets
- Uber Technologies’ $8.1 billion IPO
- Nubank’s $2.6 billion IPO and Series G-1 financing
- PayPal’s $3 billion notes offering and concurrent tender offer
- Bloom Energy’s $632.5 million green convertible notes and capped call transactions
- Citirix’s $750 million notes offering
- Coursera’s $519.1 million IPO
- AssetMark’s $316 million IPO
- Paymentus’ $241.5 million IPO
- Aligos Therapeutics’ $150 million IPO
- Surgalign Holdings’ $37.5 million follow-on offering
General Corporate Advice
- Tierney regularly provides general corporate advice to companies, including Arcade Beauty and AssetMark
Education
- Gerald Gunther Prize in Deals II
- Judge Thelton E. Henderson Prize in Organizations & Transactions Clinic
- Managing Editor, Stanford Journal of International Law
- Executive Editor, Stanford Law Review
- Phi Beta Kappa
Professional history
- Davis Polk since 2017
Qualifications and admissions
- State of California