LOS ANGELES — In a show of solidarity, many of the film industry’s major players, and some sympathetic lawmakers, have aligned in an 11th-hour push to block new financial instruments that would allow traders to swap contracts tied to box-office results.

A coalition led by the Motion Picture Association of America was expected to file by Thursday comments that would urge the Commodities Futures Trading Commission to reject a request by Veriana Networks to create a market for film futures contracts. Some of Hollywood’s largest labor unions and professional organizations will back the M.P.A.A.’s push.

Among those who spent the week coordinating their objections were the Directors Guild of America, the International Alliance of Theatrical Stage Employees and the Independent Film and Television Alliance. The M.P.A.A. represents the major film studios, including 20th Century Fox, Paramount Pictures, Sony Pictures Entertainment, Universal Studios, Walt Disney Studios and Warner Brothers.

The expected comments will address the first of four approvals that would allow Veriana Networks and a separate exchange run by Cantor Fitzgerald to begin making markets in the contracts.