By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Rackspace Hosting Inc. and Zynga Inc. were among the notable tech stocks to advance Tuesday as the overall sector manages to close with mild gains.

Rackspace (RAX) pulled back from its high point, but still ended the day with a gain of 3.5% at $33.86 a share. Before the market opened, Morgan Stanley analyst Simon Flannery raised his rating on Rackspace's stock to overweight, or buy, from equal-weight, and set a price target of $45 a share.

Flannery cited improvements in order bookings and a differentiated product line among the reasons for his rating upgrade.

Zynga (ZNGA) came back from its losses on Monday to rise nearly 3% and close at $4.84 a share. An IPO from Zynga rival King Digital Entertainment was expected to price after the close of trading Tuesday. However, skepticism over the growth prospects for the "Candy Crush Saga" developer began to weigh on the opinions of some industry analysts.

Attention was also being given to Box Inc., as the cloud-computing company filed its initial paperwork late Monday to go public.

Amazon.com Inc. (AMZN) shares rose $2.86 to close at $354.71 one day ahead of the e-commerce kingpin's AWS Summit in San Francisco, where the company will give updates on its growing Web services business.

Microsoft Corp. (MSFT) shares shed 16 cents to close at $40.34. Anticipation continued to grow in advance of Chief Executive Satya Nadella's first press conference as CEO on Thursday.

EBay Inc. (EBAY) was trimmed by 21 cents a share to end the day at $56.33. The e-commerce leader issued a "definitive" proxy statement and set a date of May 13 for its annual shareholders meeting.

In its letter to shareholders, eBay urged shareholders to vote against a nonbinding proposal by investor Carl Icahn for the company to spin off PayPal in an IPO. EBay is also against Icahn's efforts to get two of his nominees on the company's board of directors. On Monday, Icahn called his plan for eBay to spin off 20% of PayPal as one of "pragmatism."

Among other bellwether tech companies, gains came from Apple Inc. (AAPL), Facebook Inc. (FB), IBM Corp. (IBM) and Hewlett-Packard Co. (HPQ).

The Nasdaq Composite Index (RIXF) rose almost 8 points to close at 4,234 and the Philadelphia Semiconductor Index (SOX) ended the day with a gain of nearly 1%.

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