NEW YORK--(BUSINESS WIRE)--Underperforming equity prices across the midstream space could negatively affect master limited partnership (MLP) funding, according to Fitch Ratings. Equity prices across the midstream space have weakened as falling commodity prices continue to weigh on midstream energy issuers. The Alerian MLP Index is down roughly 23% year to date through Aug. 11, 2015. Equity prices remain suppressed and the ability and willingness to fund capital spending with equity is becoming