Largest patent law firms by registered practitioners

The 10 U.S. practices with the most USPTO-registered patent attorneys and agents on the September 2026 roster, with each firm's change since September 2025.

1. Finnegan Henderson Farabow Garrett Dunner: 234 registered practitioners (+1.7% in 12 months)
2. Wilson Sonsini Goodrich & Rosati: 234 registered practitioners (-4.1% in 12 months)
3. Fish & Richardson P.C: 219 registered practitioners (-0.9% in 12 months)
4. Foley & Lardner, LLP: 218 registered practitioners (+5.3% in 12 months)
5. Kilpatrick Townsend & Stockton LLP: 209 registered practitioners (+1.0% in 12 months)
6. Knobbe Martens Olson & Bear LLP: 208 registered practitioners (-1.9% in 12 months)
7. Morrison & Foerster LLP: 168 registered practitioners (-5.6% in 12 months)
8. Cooley LLP: 149 registered practitioners (+7.2% in 12 months)
9. Morgan Lewis & Bockius LLP: 149 registered practitioners (+2.8% in 12 months)
10. Jones Day: 146 registered practitioners (+1.4% in 12 months)