Ramji was previously global head of iShares & index investing at BlackRock.
Simons founded what would become Renaissance Technologies in 1978.
She took over the JPMorgan Equity Income fund in August 2004.
The group aims to grow asset management outside Japan by lifting teams and making acquisitions.
Harkins was previously head of markets at Cboe Global Markets.
Alan Turing Institute data revealed that less than 25% of women work in AI and data science in the UK.
Trader denies he was trying to hide deals.
Rich Handler said he does not intend to sell any further shares.
A search will be launched for Peter Harrison's successor.
