	brokerage firm ups stake in allegheny ag the new york brokerage firm of spear leeds and kellogg told the securities and exchange commission it had increased its preferred stock in allegheny international inc to pct from pct it said it may buy additional shares but had not decided whether to offer its shares in response to a tender offer by sunter uisition corp a unit of first boston inc the brokerage firm said it bought the allegheny shares march april for dlrs each reuter 
