JANA Partners Management, LP is an institutional investment manager that files quarterly 13F reports with the SEC. As of Q2 2026, the fund manages $1.9B in reported equity holdings across 10 positions. The largest holdings are MRCY (25.5%), COO (13.5%), SPY (13.5%), LW (12.2%), FISV (9.4%). The portfolio is concentrated in Other (82.4%), Healthcare (13.5%), Technology (4.1%). Data sourced from SEC EDGAR 13F filings (CIK 1998597).