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Nierenberg Investment Management Company, LLC

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13F filer, CIK 1282683, Camas, WA

Nierenberg Investment Management Company, LLC reported $205,958,657 across 47 holdings for the quarter ended 2025-12-31, in a 13F-HR filed 2026-02-13. Its ten largest share positions make up 89.54% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001941040-26-000138

Period
2025-12-31
Reported value
$206M
Holdings
47
Top 10 weight
89.54%
New
10
Sold out
15

Largest buys vs the previous quarter

SecurityShares changeApprox. value
SGOVnew+640,597$64.3M
RKTnew+1,336,631$25.9M
CRTOadded+463,929$9.56M
FCNnew+9,555$1.63M
VRTnew+7,000$1.13M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
POTBELLY CORPexited-2,980,564-$50.8M
MR COOPER GROUP INCexited-126,121-$26.6M
ADTNreduced-250,000-$2.17M
MTCHexited-56,680-$2M
TPCexited-24,680-$1.62M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Holdings, Q4 2025

Share positions as resolved from 13F-HR 0001941040-26-000138, largest first. % of portfolio is the value over $198,194,885, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
SGOVISHARES TRQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 640,597 shares 640,597$64.3M32.44%newTimeline
EQTEQT CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 536,693 shares; 2024Q4: 536,693 shares; 2025Q1: 536,693 shares; 2025Q2: 536,693 shares; 2025Q3: 536,693 shares; 2025Q4: 533,363 shares 533,363$28.6M14.42%-3,330Timeline
RKTROCKET COS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 1,336,631 shares 1,336,631$25.9M13.06%newTimeline
CRTOCRITEO S AQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 67,555 shares; 2025Q1: 266,498 shares; 2025Q2: 535,702 shares; 2025Q3: 424,959 shares; 2025Q4: 888,888 shares 888,888$18.3M9.24%+463,929Timeline
LYFTLYFT INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: 42,555 shares; 2025Q3: 813,555 shares; 2025Q4: 813,555 shares 813,555$15.8M7.95%0Timeline
RVSBRIVERVIEW BANCORP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 1,060,600 shares; 2024Q4: 1,286,422 shares; 2025Q1: 1,633,034 shares; 2025Q2: 1,937,775 shares; 2025Q3: 2,032,775 shares; 2025Q4: 2,032,775 shares 2,032,775$10.2M5.15%0Timeline
BKDBROOKDALE SR LIVING INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 160,110 shares; 2024Q4: 160,110 shares; 2025Q1: 410,110 shares; 2025Q2: 410,110 shares; 2025Q3: 410,110 shares; 2025Q4: 410,110 shares 410,110$4.43M2.23%0Timeline
GDOTGREEN DOT CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 77,555 shares; 2025Q2: 339,110 shares; 2025Q3: 339,110 shares; 2025Q4: 339,110 shares 339,110$4.34M2.19%0Timeline
KBRKBR INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 50,710 shares; 2024Q4: 50,710 shares; 2025Q1: 53,710 shares; 2025Q2: 53,710 shares; 2025Q3: 53,710 shares; 2025Q4: 73,710 shares 73,710$2.96M1.5%+20,000Timeline
CNXCCONCENTRIX CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 34,310 shares; 2024Q4: 64,480 shares; 2025Q1: 64,480 shares; 2025Q2: 50,480 shares; 2025Q3: 50,480 shares; 2025Q4: 64,480 shares 64,480$2.68M1.35%+14,000Timeline
ECVTECOVYST INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 227,610 shares; 2024Q4: 228,810 shares; 2025Q1: 228,810 shares; 2025Q2: 228,810 shares; 2025Q3: 228,810 shares; 2025Q4: 228,810 shares 228,810$2.23M1.12%0Timeline
DHCDIVERSIFIED HEALTHCARE TRQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 456,110 shares; 2024Q4: 456,110 shares; 2025Q1: 456,110 shares; 2025Q2: 456,110 shares; 2025Q3: 456,110 shares; 2025Q4: 456,110 shares 456,110$2.21M1.12%0Timeline
EXEEXPAND ENERGY CORPORATIONQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 255 shares; 2024Q4: 19,555 shares; 2025Q1: 19,555 shares; 2025Q2: 15,555 shares; 2025Q3: 15,555 shares; 2025Q4: 15,555 shares 15,555$1.72M0.87%0Timeline
FCNFTI CONSULTING INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 9,555 shares 9,555$1.63M0.82%newTimeline
DXCDXC TECHNOLOGY COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 13,555 shares; 2024Q4: 13,555 shares; 2025Q1: 13,555 shares; 2025Q2: 13,555 shares; 2025Q3: 99,555 shares; 2025Q4: 102,510 shares 102,510$1.5M0.76%+2,955Timeline
SEBSEABOARD CORP DELQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 286 shares; 2025Q2: 286 shares; 2025Q3: 286 shares; 2025Q4: 286 shares 286$1.27M0.64%0Timeline
BFHBREAD FINANCIAL HOLDINGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 20,680 shares; 2024Q4: 27,680 shares; 2025Q1: not reported; 2025Q2: 15,380 shares; 2025Q3: 15,380 shares; 2025Q4: 15,380 shares 15,380$1.14M0.57%0Timeline
VRTVERTIV HOLDINGS COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 7,000 shares 7,000$1.13M0.57%newTimeline
TNDMTANDEM DIABETES CARE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 44,555 shares 44,555$979K0.49%newTimeline
GLREGREENLIGHT CAP RE LTDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 55,555 shares 55,555$810K0.41%newTimeline
ADTNADTRAN HOLDINGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 343,110 shares; 2024Q4: 343,110 shares; 2025Q1: 435,110 shares; 2025Q2: 343,110 shares; 2025Q3: 343,110 shares; 2025Q4: 93,110 shares 93,110$809K0.41%-250,000Timeline
HOSHORNBECK OFFSHORE SERVICES IQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 113,450 shares; 2024Q4: 124,450 shares; 2025Q1: 124,450 shares; 2025Q2: 124,450 shares; 2025Q3: 124,450 shares; 2025Q4: 124,450 shares 124,450$780K0.39%0Timeline
OISOIL STS INTL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 23,555 shares; 2025Q1: 111,555 shares; 2025Q2: 111,555 shares; 2025Q3: 111,555 shares; 2025Q4: 111,555 shares 111,555$755K0.38%0Timeline
TTGTTECHTARGET INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 111,555 shares; 2025Q4: 136,910 shares 136,910$739K0.37%+25,355Timeline
OSKOSHKOSH CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 5,555 shares; 2024Q4: 5,750 shares; 2025Q1: 5,750 shares; 2025Q2: 5,750 shares; 2025Q3: 5,750 shares; 2025Q4: 5,750 shares 5,750$722K0.36%0Timeline
CLFDCLEARFIELD INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 57,510 shares; 2024Q4: 41,510 shares; 2025Q1: 40,510 shares; 2025Q2: 34,510 shares; 2025Q3: 16,510 shares; 2025Q4: 16,510 shares 16,510$481K0.24%0Timeline
FLRFLUOR CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 432,058 shares; 2024Q4: 122,555 shares; 2025Q1: 6,555 shares; 2025Q2: 6,555 shares; 2025Q3: 6,555 shares; 2025Q4: 6,555 shares 6,555$260K0.13%0Timeline
GIFIGULF ISLAND FABRICATION INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 155,555 shares; 2024Q4: 155,555 shares; 2025Q1: 99,555 shares; 2025Q2: 17,555 shares; 2025Q3: 17,555 shares; 2025Q4: 17,555 shares 17,555$210K0.11%0Timeline
PLABPHOTRONICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 23,330 shares; 2024Q4: 23,330 shares; 2025Q1: 23,330 shares; 2025Q2: 34,330 shares; 2025Q3: not reported; 2025Q4: 6,330 shares 6,330$203K0.1%newTimeline
TTECTTEC HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 55,555 shares 55,555$200K0.1%newTimeline
ARHSARHAUS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 59,310 shares; 2024Q4: 59,310 shares; 2025Q1: 59,310 shares; 2025Q2: 59,310 shares; 2025Q3: 59,310 shares; 2025Q4: 15,310 shares 15,310$172K0.09%-44,000Timeline
HOPEHOPE BANCORP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 99,555 shares; 2024Q4: 99,555 shares; 2025Q1: 99,555 shares; 2025Q2: 99,555 shares; 2025Q3: not reported; 2025Q4: 12,555 shares 12,555$138K0.07%newTimeline
WNCWABASH NATL CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 55,555 shares; 2025Q2: 77,555 shares; 2025Q3: 12,555 shares; 2025Q4: 12,555 shares 12,555$109K0.05%0Timeline
OSURORASURE TECHNOLOGIES INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: 11,555 shares; 2025Q3: 44,555 shares; 2025Q4: 44,555 shares 44,555$108K0.05%0Timeline
FORRFORRESTER RESH INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 11,555 shares; 2025Q4: 11,555 shares 11,555$93.8K0.05%0Timeline
ACHACCENDRA HEALTH INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 27,555 shares; 2025Q4: 27,555 shares 27,555$77.2K0.04%0Timeline
CTMXCYTOMX THERAPEUTICS INC.Quarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 12,555 shares; 2024Q4: 12,555 shares; 2025Q1: 12,555 shares; 2025Q2: 12,555 shares; 2025Q3: 12,555 shares; 2025Q4: 12,555 shares 12,555$53.5K0.03%0Timeline
EBEVENTBRITE INC-CLASS AQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 11,555 shares; 2025Q4: 11,555 shares 11,555$51.4K0.03%0Timeline
SCYXSCYNEXIS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 75,555 shares; 2024Q4: 75,555 shares; 2025Q1: 75,555 shares; 2025Q2: 75,555 shares; 2025Q3: 75,555 shares; 2025Q4: 75,555 shares 75,555$47.8K0.02%0Timeline
TALKTALKSPACE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 11,555 shares; 2025Q4: 11,555 shares 11,555$41.9K0.02%0Timeline
WTIW & T OFFSHORE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 13,555 shares; 2024Q4: 13,555 shares; 2025Q1: 13,555 shares; 2025Q2: 13,555 shares; 2025Q3: 13,555 shares; 2025Q4: 13,555 shares 13,555$22.1K0.01%0Timeline
NNBRNN INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 222,555 shares; 2025Q2: 13,555 shares; 2025Q3: 13,555 shares; 2025Q4: 13,555 shares 13,555$17.4K0.01%0Timeline
OLPXOLAPLEX HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 12,555 shares; 2024Q4: 12,555 shares; 2025Q1: 12,555 shares; 2025Q2: 12,555 shares; 2025Q3: 12,555 shares; 2025Q4: 12,555 shares 12,555$16.8K0.01%0Timeline

Options

Puts and calls, as filed. The amount and value describe the underlying shares, not the option premium, so they stay out of % of portfolio (H5).

SecurityTypeAmountValueChange
GEVGE VERNOVA INC COMput7,600$4.97M-3,600
EXEEXPAND ENERGY CORPORATION Stockcall14,000$1.55M0
CNXCCONCENTRIX CORP COMcall20,000$832Knew
ACHACCENDRA HEALTH INC COMput150,000$420K0

Sold out in Q4 2025

Positions in the previous quarter's report that this quarter's report no longer lists.

SecurityShares beforeValue beforeType
POTBELLY CORPPOTBELLY CORP2,980,564$50.8Mshares
MR COOPER GROUP INCMR COOPER GROUP INC126,121$26.6Mshares
SPYSTATE STR SPDR S&P 500 ETF T25,000$16.7Mput
QQQINVESCO QQQ TR17,100$10.3Mput
NVDANVIDIA CORPORATION22,800$4.25Mput
AVGOBROADCOM INC10,200$3.37Mput
VRTVERTIV HOLDINGS CO21,200$3.2Mput
ANETARISTA NETWORKS INC18,600$2.71Mput
CEGCONSTELLATION ENERGY CORP7,100$2.34Mput
MTCHMATCH GROUP INC NEW56,680$2Mshares
TPCTUTOR PERINI CORP24,680$1.62Mshares
RRCRANGE RES CORP29,555$1.11Mshares
PLPCPREFORMED LINE PRODS CO4,555$893Kshares
BRYBerry Corp160,000$605Kcall
ETNEATON CORP PLC1,600$599Kput

How Q4 2025 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0001941040-26-000138 base2026-02-13acceptance time not in the bulk data set