RIT Capital Partners said net assets have risen by over a quarter of a billion pounds since the start of the year.The most recent unaudited net asset value (NAV) per share was 1,354p at the end of October, representing a year to date NAV total return of 16%, according to a trading update on Monday.Over the same period RIT's share price total return was 14.6%. The closing share price on October 31st was 1,267p.In the four months from July 1st, RIT's share price total return was 10.5% and NAV total return was 2%.The group said its regional focus remains on US and Japan with some select opportunities in Europe."The board was strengthened by the appointment of Hannah Rothschild and Mike Wilson," the firm added. Shares rose 0.72% to 1,261p at 11:18 on Monday. RD