TOKYO, Aug 28 (Reuters) - Berkshire Hathaway ( BRK/A ), through

its wholly-owned unit National Indemnity Company, has raised its

stake in Japan's Mitsubishi Corp ( MSBHF ) and Mitsui & Co ( MITSF )

, the companies said on Thursday.

Berkshire raised its stake in Mitsubishi ( MSBHF ) to 10.23% from

9.74% previously, the company said in a market disclosure. A

Mitsui ( MITSF ) official confirmed Berkshire had raised its stake, but

declined to give a percentage.

Its prior stake in Mitsui ( MITSF ) was 9.82%.

Berkshire previously raised its holdings in five Japanese

trading houses, including Mitsubishi ( MSBHF ) and Mitsui ( MITSF ), in March.

Shares in Mitsubishi ( MSBHF ) rose 1.85% and Mitsui ( MITSF ) was up 1.23%

on Thursday, while the benchmark Nikkei gained 0.73%.

Sumitomo Corp ( SSUMF ) rose 1.1%, Itochu ( ITOCF )

increased 1.15% and Marubeni ( MARUF ) gained 1.17%.