ZURICH, Dec 13 (Reuters) - Credit Suisse (CSGN.S) is planning a sixth payout in mid-December of around $400 million to investors in frozen supply chain finance funds linked to Greensill, bringing the total amount returned to around $6.7 billion, the Swiss bank said on Monday. Credit Suisse had to suspend $10 billion in funds linked to the British supply chain financing firm in March and has been paying back the money it recoups in stages. It said in a statement it had been able to recover around $7.2 billion to date. read more