By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Most tech stocks followed the broader market south as trading progressed Thursday, but Amazon.com Inc. managed to hold on to a small gain, suggesting investors approve of the online retailer's plan to raise the price of its popular Prime subscription by $20 a year.

Amazon shares remained up by 1% at $374.39 after Amazon sent a letter to its Prime subscribers, the move to the new price of $99 a year will take effect on the anniversary of a member's subscription. Amazon (AMZN) is offering a promotion for new members to lock in their Prime subscriptions at the $79 rate for the first year if they sign up within the next seven days.

Read: Amazon gains show market likes new Prime price

For their annual fee, Prime subscribers get free, two-day shipping on almost anything sold via Amazon and have access to more than 150,000 movies and TV show episodes available on the company's Prime Instant video service.

Amazon had said on its fourth-quarter earnings call in January that it was likely to raise the price on Prime subscriptions because of increased shipping costs.

"People think churn [subscriber turnover] will be low," said Mark Mahaney, of RBC Capital Markets. "The $99 isn't scary, so it's accretive."

Also read: Prime price hike could bring in $374 million a year

Despite Amazon's gains, which were even higher earlier in the day, nearly all of the rest of the tech sector was in the red. Losses came from sector leaders like Apple Inc. (AAPL), Yahoo Inc. (YHOO), Intel Corp. (INTC) and Netflix Inc. (NFLX).

Decliners included NetApp Inc. (NTAP), which gave up 3% to fall to $36.69. Late Wednesday, the storage-technology company said it would trim about 600 jobs, or around 5% of its workforce, and take a charge of between $35 million and $45 million in its fiscal fourth quarter, which ends in April.

The Nasdaq Composite Index (RIXF), which had been up early, let the brakes go and was down by 54 points, or 1.3%, at 4,268. The Philadelphia Semiconductor Index (SOX) was also off by 1.7%.

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