By Kentaro Okasaka
TOKYO, Aug 28 (Reuters) - Berkshire Hathaway, through its wholly-owned unit National Indemnity Company, has raised its stake in Japan's Mitsubishi Corp 8058.T and Mitsui & Co 8031.T, the companies said on Thursday.
Berkshire raised its stake in Mitsubishi to 10.23% from 9.74% previously, the company said in a market disclosure. A Mitsui official confirmed Berkshire had raised its stake, but declined to give a percentage.
Its prior stake in Mitsui was 9.82%.
Berkshire previously raised its holdings in five Japanese trading houses, including Mitsubishi and Mitsui, in March.
Shares in Mitsubishi rose 1.85% and Mitsui was up 1.23% on Thursday, while the benchmark Nikkei .N225 gained 0.73%.
Sumitomo Corp 8053.T rose 1.1%, Itochu 8001.T increased 1.15% and Marubeni 8002.T gained 1.17%.