Prudential PLC has sued to invalidate American International Group Inc.’s rival bid for Houston-based American General Corp., but analysts said they doubt the maneuver would work.

The suit, filed late Monday in Texas State District Court, says American International had not yet filed the papers necessary for its offer of $23 billion in stock. It accuses the company of “gun jumping” and cites the Securities Act of 1933, which prohibits offering securities without prior filing of a registration statement.

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