Software provider Service Now NOW.N plunged after its CEO's remarks about macro headwinds and currency pressures. By Stephen Culp NEW YORK, July 12 (Reuters) - Wall Street ended in negative territory on Tuesday as growing signs of recession kept buyers out of the equities market ahead of inflation data. While all three major U.S. stock indexes seesawed between modest gains and losses earlier in the session, they turned sharply lower late in the day as Wednesday's Consumer Prices report from the Labor Department drew near, with big bank earnings looming later in the week.