Sandridge Energy, Inc.
An independent oil and natural gas company, SandRidge Energy explores for and produces fuel from onshore fields in the U.S. Mid-Continent, mainly in Oklahoma, Kansas, and Texas, targeting the Cherokee play. Founder Tom Ward, who earlier co-founded Chesapeake Energy, bought into Riata Energy in 2006 and renamed it SandRidge, a name echoing the Old English words for "sandy ridge" and the terrain where it drills.
Estimated from filings — the split-adjusted price range over the quarters each manager built the position. A range, not a fill price; 13F reports a quarter-end snapshot, not a trade date.