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* Mizuho downgrades Apple shares
* S&P tech sector set for worst 2-day drop since September
* Energy stocks, banks lead S&P gainers
* Indexes down: Dow 0.29 pct, S&P 0.34 pct, Nasdaq 0.87 pct (Updates to early afternoon)
By Yashaswini Swamynathan
June 12 (Reuters) - The Nasdaq Composite was on track for its biggest two-day loss since September as a bout of profit-taking in the richly-valued technology stocks took a toll on Wall Street.
Strong quarterly earnings have helped technology stocks fill a void left by financial and industrial stocks after a post-election rally faded. The S&P 500 technology index has risen 18.5 percent this year and is on track to register its best yearly performance since 2014.
"The real heavy lifting, or 40 percent of the move, that we saw was really on the back of a handful of technology stocks," said Art Hogan, chief market strategist at Wunderlich Equity Capital Markets.
"So when you have a trade that is so crowded that unwind becomes as dramatic as the one we saw on Friday."
Investors saw an opportunity to book profits on Friday after Apple shares suffered their worst drop in 14 months amid reports that the company was using slower modems in upcoming iPhones, compared with those used in rival phones.
Shares of the world's most valuable publicly-listed company were off 3 percent at $144.42 on Monday.
Mizuho Securities cut its rating on Apple to "neutral" from "buy" on Monday, saying the stock had outperformed this year and that the "upcoming product cycle is fully captured at current levels".
The S&P technology sector was down 1.4 percent, putting it on track for its worst two-day decline in nearly a year, as other technology heavyweights including Microsoft, Facebook and Alphabet also took a hit.
The selloff in technology stocks spread through European and Asian markets as well.
At 12:38 p.m. ET (1638 GMT), the Dow Jones Industrial Average was down 62.59 points, or 0.29 percent, at 21,209.38, the S&P 500 was down 8.15 points, or 0.34 percent, at 2,423.62 and the Nasdaq Composite was down 54.03 points, or 0.87 percent, at 6,153.89.
However, gains in the energy sector and financials helped contain the decline on the broader S&P 500 index.
"Money is finding home in unloved sectors like financials and energy," Hogan said.
Shares of General Electric rose 3.8 percent to $29 after the company said Jeff Immelt would retire as chief executive and would be replaced by John Flannery, the head of GE healthcare, ending a years-long succession plan. GE was the top stock on the S&P 500.
Coherus BioSciences tumbled 29 percent to $14.65 after the FDA denied the approval of its biosimilar for Amgen's Neulasta. Amgen was up 1.5 at $166.61.
Declining issues outnumbered advancers on the NYSE by 1,433 to 1,388. On the Nasdaq, 1,587 issues fell and 1,227 advanced.
The S&P 500 index showed 28 new 52-week highs and 11 new lows, while the Nasdaq recorded 82 new highs and 70 new lows. (Reporting by Yashaswini Swamynathan in Bengaluru; Editing by Anil D'Silva)