You're thinking of Pwn2Own. Pwnium has always required disclosure, while Pwn2Own only required full disclosure for the first time this year.
And $150,000 is actually getting quite close to what you could make for an exploit of a browser on the black market, especially with all those Java and Flash plugins still running all over the world, depressing exploit prices as long as they're available.
And $150,000 is actually getting quite close to what you could make for an exploit of a browser on the black market, especially with all those Java and Flash plugins still running all over the world, depressing exploit prices as long as they're available.