* Banks, insurers underperform on global growth concerns
* Automakers fall after U.S. peers make demands for a trade deal
* Retail investors selling stocks for SoftBank listing - analysts
By Ayai Tomisawa
TOKYO, Dec 11 (Reuters) - Japan’s Nikkei bounced around on Tuesday morning, but was mostly in the red as worries about global growth pressured financial stocks and uncertainty over a U.S.-Japan trade deal hit automakers.
The Nikkei share average, briefly up after the opening, was down 0.2 percent to 21,284.61 in midmorning trade.
Earlier, it was off 0.7 percent to a six-week low of 21,062.31. If the index falls below 20,971.93, it will be at the lowest level since March.
The broader Topix fell 1 percent to 1,573.45, the lowest level since June 2017.
Financial shares underperformed, dragged down by a sell-off in global peers such as Citigroup and Bank of America , after uncertainty over Britain’s exit from the European Union kept investors on edge about global growth.
Mitsubishi UFJ Financial Group tumbled 2.5 percent and Mizuho Financial Group shed 1.4 percent.
“As investors are worried about the impact on slowing global growth and interest rates on banks, they are likely to avoid buying banking shares for a while,” said Takuya Takahashi, a strategist at Daiwa Securities.
Life insurers, which invest in higher-yielding products such as foreign bonds, lost ground as well. Dai-ichi Life Holdings slid 2.3 percent, T&D Holdings 2.5 percent and MS&AD Insurance 1.9 percent.
Automakers were sold after Detroit peers and labour unions on Monday insisted that any U.S. trade deal with Japan contain strong provisions to combat currency manipulation and pry open Japan’s largely closed auto market before lowering any U.S. autos tariffs.
Honda Motor fell 0.8 percent, Nissan Motor plunged 2.7 percent and Subaru Corp tanked 2.1 percent.
Analysts said retail investors are seen selling some of their overall holdings to prepare for the Dec. 19 listing of SoftBank Group’s telco unit SoftBank Corp’s.
SoftBank said that demand was greater than the number of shares on offer.
“Retail investors are seen taking profits on some of their holdings to buy SoftBank shares today as it takes several days to convert stocks to cash,” said Norihiro Fujito, a chief investment strategist at Mitsubishi UFJ Morgan Stanley Securities.
“Their selling is also thought to be one of the reasons for the market’s weakness.”
Defensive stocks outperformed. Chubu Electric Power Co rose 1.0 percent, Tokyo Gas advanced 1.2 percent and realtor Mitsui Fudosan gained 1 percent. (Editing by Richard Borsuk)