The contribution is in addition to $26,000 the company gave Brown last year.
The Democratic governor has not yet said whether he will seek re-election next year, but he has raised more than $10 million for the effort and is widely expected to run.
Brown is currently in the process of deciding whether to sign or veto hundreds of bills sent to him before the Legislature adjourned last week for the year.
Among donors opening their wallets after the close of session was Genentech Inc., one of a number of drug companies supporting a controversial bill on "biosimilars." Senate Bill 598, by Sen. Jerry Hill, D-San Mateo, would establish conditions under which pharmacists may distribute the new type of drugs once they are approved by the federal government.
Genentech gave Brown $15,000 on the final day of the legislative session.
A few days later, on Tuesday, a drug company that opposes the bill, Boehringer Ingelheim USA, donated $5,000 to the governor's campaign.
PHOTO: Gov. Jerry Brown speaks at the California Chamber of Commerce's annual host breakfast in Sacramento on May 22, 2013. The Associated Press/Rich Pedroncelli