RTW INVESTMENTS, LP is an institutional investment manager that files quarterly 13F reports with the SEC. As of Q4 2025, the fund manages $10.0B in reported equity holdings across 91 positions. The largest holdings are MDGL (11.6%), INSM (8.4%), PTCT (5.9%), ARGX (5.7%), PTGX (4.4%). The portfolio is concentrated in Other (96.2%), Healthcare (3.8%). Data sourced from SEC EDGAR 13F filings (CIK 1493215).