NEW YORK--(BUSINESS WIRE)--The risk of rising leverage from possible energy-related valuation write-downs and/or realized losses for 10 Fitch-rated business development companies (BDCs) is manageable, even under a scenario where oil and gas-related investments are written off completely, says Fitch Ratings. The agency is anticipating an increase in unrealized portfolio depreciation for BDCs with energy exposure when firms release fourth-quarter results next month. In a new report, Fitch shows t