Movers Roundup: Massey Energy, MannKind

Among the stock activity stories for Monday, June 8, from AP Financial News:

NEW YORK (AP) — Shares of Massey Energy Co. fell after the Supreme Court reversed a West Virginia court's verdict, citing the coal miner's financial support for a judge's campaign.

NEW YORK (AP) — Shares of MannKind Corp. surged to a new 52-week peak after the company reported positive study data for its inhalable insulin candidate Afresa and said it started developing a new inhalable medication system.

NEW YORK (AP) — Shares of Arena Pharmaceuticals Inc. climbed after the company said its obesity drug candidate lorcaserin helped patients lose and keep off weight in a clinical trial.

NEW YORK (AP) — Shares of development stage biotechnology company CytRx Corp. jumped after a Rodman & Renshaw analyst began covering the stock with his highest rating.

NEW YORK (AP) — Shares of Equinix Inc. retreated along with the rest of Wall Street after the data center and Internet exchange service provider said it plans to offer $250 million in convertible subordinated notes due 2016 under a shelf registration.