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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 $201,487,101 across 46 holdings for the quarter ended 2026-03-31, in a 13F-HR filed 2026-05-13. Its ten largest share positions make up 87.26% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001941040-26-000327

Period
2026-03-31
Reported value
$201M
Holdings
46
Top 10 weight
87.26%
New
7
Sold out
8

Largest buys vs the previous quarter

SecurityShares changeApprox. value
KBRadded+312,733$11.5M
CARTnew+291,888$10.9M
LYFTadded+482,068$6.41M
CRTOadded+163,899$2.94M
FIVNnew+135,810$2.06M

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
RKTreduced-907,000-$12.9M
SGOVreduced-90,000-$9.06M
ECVTexited-228,810-$2.23M
BKDreduced-155,000-$2.12M
SEBexited-286-$1.27M

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, Q1 2026

Share positions as resolved from 13F-HR 0001941040-26-000327, largest first. % of portfolio is the value over $200,825,901, 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; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 640,597 shares; 2026Q1: 550,597 shares 550,597$55.4M27.6%-90,000Timeline
EQTEQT CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 533,363 shares 533,363$33.9M16.9%0Timeline
CRTOCRITEO S AQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 1,052,787 shares 1,052,787$18.9M9.4%+163,899Timeline
LYFTLYFT INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: 42,555 shares; 2025Q3: 813,555 shares; 2025Q4: 813,555 shares; 2026Q1: 1,295,623 shares 1,295,623$17.2M8.58%+482,068Timeline
KBRKBR INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 386,443 shares 386,443$14.2M7.09%+312,733Timeline
RVSBRIVERVIEW BANCORP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 2,032,775 shares 2,032,775$11.2M5.57%0Timeline
CARTMAPLEBEAR INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 291,888 shares 291,888$10.9M5.44%newTimeline
RKTROCKET COS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 1,336,631 shares; 2026Q1: 429,631 shares 429,631$6.12M3.05%-907,000Timeline
GDOTGREEN DOT CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 77,555 shares; 2025Q2: 339,110 shares; 2025Q3: 339,110 shares; 2025Q4: 339,110 shares; 2026Q1: 339,110 shares 339,110$3.8M1.89%0Timeline
BKDBROOKDALE SR LIVING INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 255,110 shares 255,110$3.49M1.74%-155,000Timeline
DHCDIVERSIFIED HEALTHCARE TRQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 456,110 shares 456,110$3.03M1.51%0Timeline
FIVNFIVE9 INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 135,810 shares 135,810$2.06M1.03%newTimeline
GLREGREENLIGHT CAP RE LTDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 55,555 shares; 2026Q1: 102,510 shares 102,510$1.77M0.88%+46,955Timeline
CNXCCONCENTRIX CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 64,480 shares 64,480$1.76M0.88%0Timeline
FCNFTI CONSULTING INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 9,555 shares; 2026Q1: 9,780 shares 9,780$1.73M0.86%+225Timeline
EXEEXPAND ENERGY CORPORATIONQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 15,555 shares 15,555$1.71M0.85%0Timeline
TNDMTANDEM DIABETES CARE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 44,555 shares; 2026Q1: 79,510 shares 79,510$1.52M0.76%+34,955Timeline
CCRNCROSS CTRY HEALTHCARE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 144,555 shares 144,555$1.36M0.68%newTimeline
DXCDXC TECHNOLOGY COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 102,510 shares 102,510$1.29M0.64%0Timeline
HOSHORNBECK OFFSHORE SERVICES IQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 124,450 shares 124,450$1.23M0.61%0Timeline
ADTNADTRAN HOLDINGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 93,110 shares 93,110$1.17M0.58%0Timeline
OSKOSHKOSH CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 5,750 shares 5,750$846K0.42%0Timeline
TTGTTECHTARGET INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 111,555 shares; 2025Q4: 136,910 shares; 2026Q1: 202,910 shares 202,910$787K0.39%+66,000Timeline
FORRFORRESTER RESH INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 11,555 shares; 2025Q4: 11,555 shares; 2026Q1: 131,110 shares 131,110$742K0.37%+119,555Timeline
OCFCOCEANFIRST FINL CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 39,555 shares 39,555$714K0.36%newTimeline
HOPEHOPE BANCORP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 63,555 shares 63,555$710K0.35%+51,000Timeline
TTECTTEC HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 55,555 shares; 2026Q1: 255,555 shares 255,555$639K0.32%+200,000Timeline
CLFDCLEARFIELD INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 16,510 shares 16,510$437K0.22%0Timeline
FLRFLUOR CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 6,555 shares 6,555$306K0.15%0Timeline
PLABPHOTRONICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 6,330 shares 6,330$256K0.13%0Timeline
BFHBREAD FINANCIAL HOLDINGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 3,380 shares 3,380$253K0.13%-12,000Timeline
DHXDHI GROUP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 44,555 shares; 2025Q2: 44,555 shares; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 84,555 shares 84,555$238K0.12%newTimeline
PTLOPORTILLOS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 33,555 shares 33,555$178K0.09%newTimeline
OSURORASURE TECHNOLOGIES INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: 11,555 shares; 2025Q3: 44,555 shares; 2025Q4: 44,555 shares; 2026Q1: 55,555 shares 55,555$167K0.08%+11,000Timeline
OISOIL STS INTL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 11,555 shares 11,555$134K0.07%-100,000Timeline
WNCWABASH NATL CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 55,555 shares; 2025Q2: 77,555 shares; 2025Q3: 12,555 shares; 2025Q4: 12,555 shares; 2026Q1: 12,555 shares 12,555$108K0.05%0Timeline
ARHSARHAUS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 12,310 shares 12,310$83.5K0.04%-3,000Timeline
SCYXSCYNEXIS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 75,555 shares 75,555$69.3K0.03%0Timeline
ACHACCENDRA HEALTH INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 27,555 shares; 2025Q4: 27,555 shares; 2026Q1: 27,555 shares 27,555$62.8K0.03%0Timeline
TALKTALKSPACE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 11,555 shares; 2025Q4: 11,555 shares; 2026Q1: 11,555 shares 11,555$59.8K0.03%0Timeline
CTMXCYTOMX THERAPEUTICS INC.Quarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 12,555 shares 12,555$59K0.03%0Timeline
WTIW & T OFFSHORE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 13,555 shares 13,555$46.2K0.02%0Timeline
OLPXOLAPLEX HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 12,555 shares 12,555$25.5K0.01%0Timeline
NNBRNN INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 222,555 shares; 2025Q2: 13,555 shares; 2025Q3: 13,555 shares; 2025Q4: 13,555 shares; 2026Q1: 13,555 shares 13,555$19.7K0.01%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
CNXCCONCENTRIX CORP COMcall20,000$547K0
ACHACCENDRA HEALTH INC COMcall50,000$114Knew

Sold out in Q1 2026

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

SecurityShares beforeValue beforeType
GEVGE VERNOVA INC7,600$4.97Mput
ECVTECOVYST INC228,810$2.23Mshares
EXEEXPAND ENERGY CORPORATION14,000$1.55Mcall
SEBSEABOARD CORP DEL286$1.27Mshares
VRTVERTIV HOLDINGS CO7,000$1.13Mshares
ACHACCENDRA HEALTH INC150,000$420Kput
GIFIGULF ISLAND FABRICATION INC17,555$210Kshares
EBEVENTBRITE INC-CLASS A11,555$51.4Kshares

How Q1 2026 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 0001941040-26-000327 base2026-05-13acceptance time not in the bulk data set