Nierenberg Investment Management Company, LLC — 13F Holdings & Portfolio
CIK 1282683 · latest 13F-HR filed 2026-05-13
Nierenberg Investment Management Company, LLC manages $201.5M in 13F-reported U.S. long-equity assets across 46 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are SGOV (27.51%), EQT (16.85%), CRTO (9.37%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 6 new positions, exited 5, added to 24, and trimmed 11.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
$201.5M
Long-equity book
46
Distinct positions
2026-03-31
Filed 2026-05-13
+6 / −5 / ↑24 / ↓11
vs 2025-12-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- KBR INC$11.3M +380.7%
- EQT CORP$5.4M +18.7%
- LYFT INC$1.5M +9.3%
- RIVERVIEW BANCORP INC$975.7K +9.6%
- GREENLIGHT CAPITAL RE LTD$962.4K +118.8%
Top Trims
- ROCKET COS INC-$19.8M -76.3%
- ISHARES TR-$8.9M -13.8%
- BROOKDALE SR LIVING INC-$935.2K -21.1%
- CONCENTRIX CORP-$916.9K -34.2%
- BREAD FINANCIAL HOLDINGS INC-$885.5K -77.8%
New Positions
- MAPLEBEAR INC$10.9M
- FIVE9 INC$2.1M
- CROSS CTRY HEALTHCARE INC$1.4M
- OCEANFIRST FINL CORP$713.6K
- DHI GROUP INC$237.6K
Exited Positions
- ECOVYST INC$2.2M
- SEABOARD CORP DEL$1.3M
- VERTIV HOLDINGS CO$1.1M
- GULF IS FABRICATION INC$210.1K
- EVENTBRITE INC$51.4K
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | ISHARES TR | SGOV | 46436E718 | $55.4M | 27.51% | 550,597 | SH |
| 2 | EQT CORP | EQT | 26884L109 | $33.9M | 16.85% | 533,363 | SH |
| 3 | CRITEO S A | CRTO | 226718104 | $18.9M | 9.37% | 1,052,787 | SH |
| 4 | LYFT INC | LYFT | 55087P104 | $17.2M | 8.55% | 1,295,623 | SH |
| 5 | KBR INC | KBR | 48242W106 | $14.2M | 7.07% | 386,443 | SH |
| 6 | RIVERVIEW BANCORP INC | RVSB | 769397100 | $11.2M | 5.55% | 2,032,775 | SH |
| 7 | MAPLEBEAR INC | CART | 565394103 | $10.9M | 5.43% | 291,888 | SH |
| 8 | ROCKET COS INC | RKT | 77311W101 | $6.1M | 3.04% | 429,631 | SH |
| 9 | GREEN DOT CORP | GDOT | 39304D102 | $3.8M | 1.89% | 339,110 | SH |
| 10 | BROOKDALE SR LIVING INC | BKD | 112463104 | $3.5M | 1.73% | 255,110 | SH |
| 11 | DIVERSIFIED HEALTHCARE TR | DHC | 25525P107 | $3.0M | 1.50% | 456,110 | SH |
| 12 | FIVE9 INC | FIVN | 338307101 | $2.1M | 1.02% | 135,810 | SH |
| 13 | GREENLIGHT CAPITAL RE LTD | GLRE | G4095J109 | $1.8M | 0.88% | 102,510 | SH |
| 14 | CONCENTRIX CORP | CNXC | 20602D101 | $1.8M | 0.88% | 64,480 | SH |
| 15 | FTI CONSULTING INC | FCN | 302941109 | $1.7M | 0.86% | 9,780 | SH |
| 16 | EXPAND ENERGY CORPORATION | EXE | 165167735 | $1.7M | 0.85% | 15,555 | SH |
| 17 | TANDEM DIABETES CARE INC | TNDM | 875372203 | $1.5M | 0.76% | 79,510 | SH |
| 18 | CROSS CTRY HEALTHCARE INC | CCRN | 227483104 | $1.4M | 0.67% | 144,555 | SH |
| 19 | DXC TECHNOLOGY CO | DXC | 23355L106 | $1.3M | 0.64% | 102,510 | SH |
| 20 | HELIX ENERGY SOLUTIONS GRP I | HLX | 42330P107 | $1.2M | 0.61% | 124,450 | SH |
| 21 | ADTRAN HOLDINGS INC | ADTN | 00486H105 | $1.2M | 0.58% | 93,110 | SH |
| 22 | OSHKOSH CORP | OSK | 688239201 | $846.5K | 0.42% | 5,750 | SH |
| 23 | TECHTARGET INC | TTGT | 87874R308 | $787.3K | 0.39% | 202,910 | SH |
| 24 | FORRESTER RESH INC | FORR | 346563109 | $742.1K | 0.37% | 131,110 | SH |
| 25 | OCEANFIRST FINL CORP | OCFC | 675234108 | $713.6K | 0.35% | 39,555 | SH |
| 26 | HOPE BANCORP INC | HOPE | 43940T109 | $709.9K | 0.35% | 63,555 | SH |
| 27 | TTEC HLDGS INC | TTEC | 89854H102 | $638.9K | 0.32% | 255,555 | SH |
| 28 | CONCENTRIX CORP Call | CNXC | 20602D101 | $547.2K | 0.27% | 20,000 | SH |
| 29 | CLEARFIELD INC | CLFD | 18482P103 | $437.0K | 0.22% | 16,510 | SH |
| 30 | FLUOR CORP NEW | FLR | 343412102 | $305.8K | 0.15% | 6,555 | SH |
| 31 | PHOTRONICS INC | PLAB | 719405102 | $255.8K | 0.13% | 6,330 | SH |
| 32 | BREAD FINANCIAL HOLDINGS INC | BFH | 018581108 | $253.1K | 0.13% | 3,380 | SH |
| 33 | DHI GROUP INC | DHX | 23331S100 | $237.6K | 0.12% | 84,555 | SH |
| 34 | PORTILLOS INC | PTLO | 73642K106 | $177.5K | 0.09% | 33,555 | SH |
| 35 | ORASURE TECHNOLOGIES INC | OSUR | 68554V108 | $166.7K | 0.08% | 55,555 | SH |
| 36 | OIL STS INTL INC | OIS | 678026105 | $134.5K | 0.07% | 11,555 | SH |
| 37 | ACCENDRA HEALTH INC Call | ACH | 690732102 | $114.0K | 0.06% | 50,000 | SH |
| 38 | WABASH NATL CORP | WNC | 929566107 | $108.2K | 0.05% | 12,555 | SH |
| 39 | ARHAUS INC | ARHS | 04035M102 | $83.5K | 0.04% | 12,310 | SH |
| 40 | SCYNEXIS INC | SCYX | 811292200 | $69.3K | 0.03% | 75,555 | SH |
| 41 | ACCENDRA HEALTH INC | ACH | 690732102 | $62.8K | 0.03% | 27,555 | SH |
| 42 | TALKSPACE INC | TALK | 87427V103 | $59.8K | 0.03% | 11,555 | SH |
| 43 | CYTOMX THERAPEUTICS INC | CTMX | 23284F105 | $59.0K | 0.03% | 12,555 | SH |
| 44 | W & T OFFSHORE INC | WTI | 92922P106 | $46.2K | 0.02% | 13,555 | SH |
| 45 | OLAPLEX HLDGS INC | OLPX | 679369108 | $25.5K | 0.01% | 12,555 | SH |
| 46 | NN INC | NNBR | 629337106 | $19.7K | 0.01% | 13,555 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-13 | $201.5M | 46 | 0001941040-26-000327 |
| 2025-12-31 | 2026-02-13 | $206.0M | 47 | 0001941040-26-000138 |
| 2025-09-30 | 2025-11-12 | $234.0M | 52 | 0001941040-25-000623 |