Nierenberg Investment Management Company, LLC is an institutional investment manager that files quarterly 13F reports with the SEC. As of Q4 2025, the fund manages $206M in reported equity holdings across 44 positions. The largest holdings are ECNS.SN (31.2%), EQT (13.9%), RKT (12.6%), CRTO (8.9%), LYFT (7.7%). The portfolio is concentrated in Other (83.9%), Energy (13.9%), Technology (1.7%). Data sourced from SEC EDGAR 13F filings (CIK 1282683).