Exuberance made a comeback this year at Josh Koplewicz’s annual Halloween party. More than 1,000 people packed into a 6,000-square-foot space at the Good Units night club in Manhattan, a substantially larger crowd than in the last several years. The open bar was sponsored by Russian Standard vodka, and Mr. Koplewicz, an investment analyst at Goldman Sachs, was able to snag a big headliner: the hip-hop star Lil’ Kim, who performed dressed in a black cat costume.

The scene was more extravagant in September, at a 50th birthday party in Hong Kong for Brian Brille, the head of Bank of America Asia Pacific. Mr. Brille, who is well known on the New York social scene, wore a gray Hugh Hefner-esque jacket. Women dressed like Playmates, with feather boas and satin ears, danced behind a pink silk screen.

Two years after the onset of the financial crisis, the stock market is recovering and Wall Street’s moneyed elite are breathing easier again. And this means in some cases they are spending again — at times cautiously, but sometimes with a familiar swagger.

It’s true that firms scaled back the corporate excesses, like fancy retreats and private jets, for which they were vilified as a brutal recession gripped the country. Many of those constraints remain in place, like flying commercial on business trips, or more limited private car service for employees.