CastleArk Management

Jerry Castellini serves as President and Chief Investment Officer and is the primary decision-maker for the firm's portfolios. Robert Takazawa is a co-portfolio manager who works alongside Castellini on research and position sizing. The investment process is highly centralized, reflecting the founder-led, boutique structure of the firm (per public record).

CastleArk runs high-conviction, concentrated equity portfolios focused primarily on small-to-mid-cap companies in the energy and healthcare sectors. The firm takes large, often multi-year positions and is frequently a top shareholder in its holdings. This approach departs from widely diversified, index-aware strategies in favor of deep fundamental research on a limited number of names.

CastleArk's primary focus is limited to energy and healthcare equities, which means the firm has historically avoided material allocations to technology, financials, consumer discretionary, and other major GICS sectors. Its research process is not built for generalist coverage, and the concentrated portfolio structure effectively screens out most of the market by design.

CastleArk operates exclusively or near-exclusively in publicly traded equities, based on available public filings. There is no evidence that the firm runs private credit, venture capital, or private equity vehicles. Its investor engagement and governance activities are conducted through public-market shareholder channels.

While CastleArk invests in publicly traded exploration and production companies (historically including Callon Petroleum and Magnolia Oil & Gas), its exposure to commodity prices is indirect through equity positions. The firm's research focuses on finding undervalued operators with quality acreage and strong management, rather than taking directional views on oil or gas prices themselves.