NEW YORK ( TheStreet) -- Symantec ( SYMC) was one of tech's big laggards before market open on Tuesday after the software maker released weaker-than-expected fourth-quarter results. Shares of Symantec slid $1.47, or 8.14%, to $16.60 after the firm reported preliminary fourth-quarter revenue of $1.68 billion, down from its prior guidance of $1.72 billion to $1.73 billion. Analysts surveyed by Thomson Reuters were looking for sales of $1.73 billion. Symantec's earnings of 38 cents a share also ducked below the prior forecast of 41 cents to 42 cents a share. Analysts were looking for earnings of 42 cents. Netflix ( NFLX) was another loser, dropping 14.72% to $86.85 as investors responded to the video company's first-quarter results, released after market close on Monday. The company's stock plunged after it said it expects weaker streaming additions in the current quarter. Apple ( AAPL), which reports its second-quarter results after market close, was down 2.34% to $558.30. The iPhone maker was also one of the most active Nasdaq stocks in premarket trading on share volume of 730,719. Shares of AT&T ( T), however, gained 1.37% to reach $31 as investors responded to the telecom giant's solid first-quarter results, released before market open. --Written by James Rogers in New York. >To follow the writer on Twitter, go to http://twitter.com/jamesjrogers. >To submit a news tip, send an email to: firstname.lastname@example.org. Check out our new tech blog, Tech Trends. Follow TheStreet Tech on your wireless devices.