Helix Energy Solutions Group, Inc.
A Houston-based offshore energy services company that keeps the world's undersea oil and gas wells running smoothly — intervening in them, decommissioning aging ones, and operating robotic subsea gear for both fossil-fuel and renewable energy clients. It grew out of a diving business begun in the 1960s, and ran for decades as Cal Dive International before renaming itself Helix in 2006. Its famous vessel, the Q4000, helped contain and cap the 2010 Deepwater Horizon oil spill.
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.