Marriott International, the Bethesda hotel company, is developing a new Renaissance ClubSport brand, combining its Renaissance Hotels & Resorts with upscale membership fitness clubs.

ProFund Advisors of Bethesda, which operates a range of unconventional investment funds, opened its Short Oil & Gas ProFund and its Short Real Estate ProFund. Aimed at investors betting on a downturn in the energy or real estate sectors, both are designed to increase in value when their sector benchmarks decline.

FTI Consulting, a consultant to companies on issues such as mergers and litigation, will move its headquarters from Annapolis to Baltimore in mid-December. It will keep many of its operations in Annapolis.

Sunrise Senior Living of McLean said it will develop up to 10 senior communities, with a combined capacity for more than 900 residents, in partnership with insurer MetLife.

Maxjet, a startup discount airline based in Dulles, started accepting reservations for service that it said will begin Nov. 1 between New York's John F. Kennedy International Airport and Stansted Airport outside of London.

General Dynamics of Falls Church was permitted by the Army to resume work on a $1.2 billion small arms ammunition contract, although the Government Accountability Office has until Dec. 12 to make a decision on a protest from the losing bidder, Alliant Techsystems.

Mercer Health & Benefits is a new business combining the health and group benefits services of Marsh with those of Mercer Human Resource Consulting, both owned by Marsh & McLennan. Brian Neary will head the business locally, which has offices in Washington and Baltimore.