Onbancorp's stock fell in heavy trading Wednesday after its largest shareholder, Seymour Holtzman, proposed that the bank's management sell to or merge with a stronger financial institution.

In a press release, Mr. Holtzman complained that the Syracuse, N.Y., company's stock price had slipped 15% in three years, to $35 a share, from $41.25 on Oct. 15, 1993. Onbancorp's share price declined 50 cents Wednesday, to $34.50.

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