JPMorgan Chase & Co.'s chief executive, Jamie Dimon, told investors at the beginning of 2011 that potential repurchases of private-label mortgage securities are "not that material" for his bank — an assertion that increasingly appears to be in doubt.

Dimon might not be quite so confident these days. Gibbs & Bruns, the law firm that negotiated an $8.5 billion mortgage repurchase settlement with Bank of America Corp. on behalf of a group of large investors, has announced that it is seeking put-backs on $95 billion in private-label mortgage-backed securities issued by JPMorgan Chase, Washington Mutual and Bear Stearns.

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