SHEARSON LEHMAN BROTHERS HOLDINGS <SHE> 3RD QTR Shr 51 cts Net 51 mln dlrs vs 65 mln dlrs Revs 1.3 billion vs 1.1 billion Nine mths Shr 2.07 dlrs Net 189 mln vs 215 mln Revs 3.9 billion vs 3.3 billion NOTE: Full name is Shearson Lehman Brothers Holdings Inc Company went public May 7, 1987