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* Nikkei falls 2.6 pct, Topix sheds 2.5 pct
* Nikon, Panasonic slide on bleak earnings outlooks
* MSCI reshuffled stocks stand out, NEC Elec tumbles
By Aiko Hayashi
TOKYO, May 14 (Reuters) - Japan's Nikkei average fell to its lowest point in two weeks on Thursday as exporters slid on a firmer yen and renewed concerns about the U.S. economy, while Nikon Corp <7731.T> tumbled after it forecast its first annual operating loss in 11 years.
Panasonic Corp <6752.T> dropped after a newspaper said the consumer electronics maker is likely to post a net loss of more than $1.1 billion this financial year. [
]Stocks affected by a reshuffle in the MSCI Barra's Japan Index <.MSCIJP> were actively traded. Chipmaker NEC Electronics <6723.T> plunged more than 11 percent after being dropped and car battery maker GS Yuasa Corp <6674.T> gained after being included.
Sales at U.S. retailers fell for a second straight month in April, breaking a string of more upbeat reports that had suggested the economic slump was abating and weighing on the Dow Jones industrial average <
>, which fell 2.2 percent. [ ]"U.S. retail data proved the market had been too optimistic about a recovery in the economy," said Takahiko Murai, general manager of equities at Nozomi Securities.
"It has become hard to buy stocks sensitive to the economic cycle such as exporters or materials companies," he said.
The benchmark Nikkei <
> shed 2.6 percent or 237.90 points to 9,102.59 by midday after earlier touching its lowest since May 1.It gained 0.5 percent the previous day to inch back towards a six-month closing high struck earlier in the week.
The broader Topix <
> slid 2.5 percent to 866.30.NIKON DROPS, NEC ELEC TUMBLES
Nikon, a Japanese camera and precision equipment maker, sank 7.4 percent to 1,371 yen after forecasting an annual operating loss as chipmakers slash spending, although the loss was smaller than market expectations. [
]Panasonic declined 4.1 percent to 1,394 yen.
NEC Electronics tumbled 11.4 percent to 917 yen, while GS Yuasa Corp <6674.T> added 2.4 percent to 698 yen.
Consumer loan firm Takefuji Corp <8564.T>, which was also dropped from the MSCI Japan Index, lost 5.1 percent to 578 yen.
Exporters fell as investors fret over a stronger yen, which curbs their profits when repatriated. The dollar fell as low as 95.14 yen <JPY=> on trading platform EBS, its lowest since March 20. [
]Toyota Motor Corp <7203.T>, the world's biggest automaker, skidded 3.6 percent to 3,530 yen, while Canon Inc <7751.T> declined 3.6 percent to 3,190 yen.
Among stocks that gained, shares of Nippon Telegraph and Telephone Corp <9432.T> gained 2.6 percent to 3,990 yen after it reported an operating profit of 1.1 trillion yen ($11.5 billion) for the financial year ended March 31.
Along with GS Yuasa, Rinnai Corp <5947.T>, a maker of gas appliances, and McDonald's Holdings Co (Japan) <2702.Q> gained after their inclusion in the MSCI Barra's Japan Index.
Rinnai shot up 6.6 percent to 4,190 yen and McDonald's Holdings added 3.4 percent to 1,902 yen.
Trade was subdued on the Tokyo stock exchange's first section, with 1.1 billion shares changing hands, below last week's morning average of 1.3 billion.
Declining stocks outnumbered advancing ones by nearly 5 to 1. (Editing by Joseph Radford)