By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks ended up putting in a modestly upbeat market performance Tuesday, with Twitter Inc. posting strong gains in a shortened trading session ahead of the Christmas holiday.

U.S. stock markets closed at 1 p.m. Eastern and will remain closed through Christmas on Wednesday.

Twitter (TWTR) ended the day with a gain of more than 8% to close at $69.96. Earlier in the day, Twitter shares edged above $70 for the first time ever.

Apple Inc. (AAPL) ended the day off by $2.42 a share to close at $567.67. On Monday, Apple said it reached a deal for Chinese mobile-phone giant China Mobile Ltd. (CHL) to begin offering the iPhone 5s and iPhone 5c in January. Apple Chief Executive Tim Cook also sent an email to company employees in which he hinted at "big plans" for Apple next year.

Declines also came from Pandora Media Inc. (P), which fell 2.7% to close at $28.77 a share, as well as from Amazon.com Inc. (AMZN), Netflix Inc. (NFLX), eBay Inc. (EBAY) and Google Inc. (GOOG).

Advancers included Hewlett-Packard Co. (HPQ), Microsoft Corp. (MSFT), Yahoo Inc. (YHOO) and IBM Corp. (IBM).

The tech-heavy Nasdaq Composite Index (RIXF) ended the day with a gain of 6 points to close at 4,155, and the Philadelphia Semiconductor Index (SOX) also managed to eke out a small advance by the closing bell.

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