By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Most of the tech sector started the week in the red Monday, but Apple Inc. edged higher after announcing that it sold more than 10 million units of its new iPhone and iPhone 6 Plus smartphones over the weekend.

It was the first weekend that the new iPhones were on sale in the U.S. and around the world. Apple Chief Executive Tim Cook said the sales figures "exceeded our expectations" and that the company was working on resolving supply issues that led to some customers getting notices they would have to wait as long as four weeks to get their phones.

Apple (AAPL) shares rose 42 cents to $101.36.

Data-storage technology company EMC Corp. (EMC) was also one of the tech sector's few big-name stocks to rise, as its shares were up 38 cents at $29.91. A report said EMC, which is facing pressure from activist investor Elliott Management Corp., is considering options that might include a merger with one of its rivals.

Small gains also came from Hewlett-Packard Co. (HPQ), GoPro Inc. (GPRO) and Qualcomm Inc. (QCOM) .

The big story is still Alibaba Group Holding Ltd. (BABA), whose shares pulled back by 3% to $90.94 following the Chinese Internet giant's U.S. IPO on Friday. Alibaba said Monday that the bank's leading the IPO have the option to purchase another 48 million shares, which could lift the size of the e-commerce company's stock offering from $21.8 billion to $25.03 billion--officially making it the largest IPO ever.

Other decliners included Yahoo Inc. (YHOO), Netflix Inc. (NFLX), Microsoft Corp. (MSFT) and Facebook Inc. (FB).

The tech-heavy Nasdaq Composite Index (RIXF) fell 39 points, or almost 1%, to 4,539. The Philadelphia Semiconductor Index (SOX) was also off by almost 1%.

(Read more about the day's market activity in Movers & Shakers http://www.marketwatch.com/storyno-meta-for-guid.).

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