Friday is the deadline for financial management companies to apply to manage the city’s $6 million trust fund portfolio. Proposals are due by 10 a.m. to the purchasing department at City Hall. Bidders must have at least $200 million in assets under management to be considered. Three to five companies will be selected for interviews with the city’s trust fund commissioners. Criteria for the final selection, which is expected by March 1, will include the interview and analysis of a fee structure.