SAN FRANCISCO (MarketWatch) -- Tech stocks started the week on a largely upbeat note Monday. Among sector leaders, gains came from Apple Inc. , Microsoft Corp. , Amazon.com Inc. and Intel Corp. . Zynga Inc. shares recorded one of the sector's biggest percentage gains, rising 11% to $3.54, as the state of New Jersey made more moves toward legalizing online gambling at Atlantic City casinos. The Nasdaq Composite Index rose 18 points to 3,180.Market Pulse Stories are Rapid-fire, short news bursts on stocks and markets as they move. Visit MarketWatch.com for more information on this news.