Nierenberg Investment Management 13F, Q1 2026
David Nierenberg · quarter ending 31 March 2026 · filed 13 May 2026 · SEC CIK 1282683
Common stock only: shares the fund reported owning at the quarter end, valued as filed. The filing also lists 2 put and call lines, reported at the value of the underlying shares; they are not ownership and are not in these totals.
Largest positions, Q1 2026
The 25 largest of 44 positions. Weights are against the whole filed book. Changes are in shares held, against the Q4 2025 filing.
| Company | Ticker | Value | % of book | vs Q4 2025 |
|---|---|---|---|---|
| ISHARES TR | SGOV | $55.42M | 27.6% | -14% shares |
| EQT CORP | EQT | $33.94M | 16.9% | unchanged |
| CRITEO S A | CRTO | $18.88M | 9.4% | +18% shares |
| LYFT INC | LYFT | $17.23M | 8.6% | +59% shares |
| KBR INC | KBR | $14.24M | 7.1% | +424% shares |
| RIVERVIEW BANCORP INC | RVSB | $11.18M | 5.6% | unchanged |
| MAPLEBEAR INC | CART | $10.93M | 5.4% | new |
| ROCKET COS INC | RKT | $6.12M | 3.0% | -68% shares |
| GREEN DOT CORP | GDOT | $3.80M | 1.9% | unchanged |
| BROOKDALE SR LIVING INC | BKD | $3.49M | 1.7% | -38% shares |
| DIVERSIFIED HEALTHCARE TR | DHC | $3.03M | 1.5% | unchanged |
| FIVE9 INC | FIVN | $2.06M | 1.0% | new |
| GREENLIGHT CAPITAL RE LTD | $1.77M | 0.9% | +85% shares | |
| CONCENTRIX CORP | CNXC | $1.76M | 0.9% | unchanged |
| FTI CONSULTING INC | FCN | $1.73M | 0.9% | +2% shares |
| EXPAND ENERGY CORPORATION | EXE | $1.71M | 0.8% | unchanged |
| TANDEM DIABETES CARE INC | TNDM | $1.52M | 0.8% | +79% shares |
| CROSS CTRY HEALTHCARE INC | CCRN | $1.36M | 0.7% | new |
| DXC TECHNOLOGY CO | DXC | $1.29M | 0.6% | unchanged |
| HELIX ENERGY SOLUTIONS GRP I | HLX | $1.23M | 0.6% | unchanged |
| ADTRAN HOLDINGS INC | ADTN | $1.17M | 0.6% | unchanged |
| OSHKOSH CORP | OSK | $846.5K | 0.4% | unchanged |
| TECHTARGET INC | TTGT | $787.3K | 0.4% | +48% shares |
| FORRESTER RESH INC | FORR | $742.1K | 0.4% | +1035% shares |
| OCEANFIRST FINL CORP | OCFC | $713.6K | 0.4% | new |
What changed since Q4 2025
Against the Q4 2025 filing, Nierenberg Investment Management opened 6 new positions, added to 11, trimmed 6, left 21 unchanged and exited 5. Every position is compared, matched on its CUSIP; a change of 2% or less in shares counts as unchanged.
Other quarters
Source: SEC Form 13F-HR, accession 0001941040-26-000327, filed by Nierenberg Investment Management Company, LLC. Values are as filed and cover US-listed positions only; a 13F does not show short positions or holdings outside the US. A 13F may be filed up to 45 days after the quarter ends, so the fund may have traded since. Educational information, not financial advice.