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Greenhaven Road Investment Management, L.P.

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13F filer, CIK 1741129, GREENWICH, CT

Greenhaven Road Investment Management, L.P. reported $145,360,996 across 17 holdings for the quarter ended 2026-03-31, in a 13F-HR filed 2026-05-15. Its ten largest share positions make up 97.43% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001420506-26-001077

Period
2026-03-31
Reported value
$145M
Holdings
17
Top 10 weight
97.43%
New
4
Sold out
3

Largest buys vs the previous quarter

SecurityShares changeApprox. value
NNadded+287,333$4.6M
ALLTadded+410,000$2.73M
ZMnew+25,000$2.01M
BURadded+275,000$1.24M
MRLNnew+108,233$796K

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
LPXexited-101,323-$8.18M
KKRreduced-83,500-$7.72M
ASTSreduced-50,000-$4.14M
PINSexited-110,000-$2.85M
HGTYreduced-246,676-$2.6M

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 0001420506-26-001077, largest first. % of portfolio is the value over $145,360,996, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
HGTYHAGERTY INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 1,508,448 shares; 2024Q4: 1,236,170 shares; 2025Q1: 1,360,506 shares; 2025Q2: 1,811,539 shares; 2025Q3: 2,664,784 shares; 2025Q4: 2,616,654 shares; 2026Q1: 2,369,978 shares 2,369,978$25M17.17%-246,676Timeline
CLBTCELLEBRITE DI LTDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 2,086,411 shares; 2024Q4: 1,975,541 shares; 2025Q1: 1,572,093 shares; 2025Q2: 1,518,047 shares; 2025Q3: 1,653,047 shares; 2025Q4: 1,599,937 shares; 2026Q1: 1,535,251 shares 1,535,251$21.2M14.55%-64,686Timeline
KWYKINGSWAY CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 509,291 shares; 2024Q4: 511,060 shares; 2025Q1: 755,645 shares; 2025Q2: 1,310,536 shares; 2025Q3: 1,310,536 shares; 2025Q4: 1,884,529 shares; 2026Q1: 1,851,776 shares 1,851,776$19.3M13.29%-32,753Timeline
ASTSAST SPACEMOBILE 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: 268,000 shares; 2025Q3: 329,111 shares; 2025Q4: 275,219 shares; 2026Q1: 225,219 shares 225,219$18.7M12.84%-50,000Timeline
LFCRLIFECORE BIOMEDICAL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 2,228,784 shares; 2024Q4: 3,616,146 shares; 2025Q1: 3,616,146 shares; 2025Q2: 3,694,832 shares; 2025Q3: 3,694,832 shares; 2025Q4: 3,682,573 shares; 2026Q1: 3,537,573 shares 3,537,573$13.2M9.05%-145,000Timeline
PARPAR TECHNOLOGY CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 1,200,374 shares; 2024Q4: 878,258 shares; 2025Q1: 1,007,289 shares; 2025Q2: 995,014 shares; 2025Q3: 973,198 shares; 2025Q4: 886,883 shares; 2026Q1: 810,444 shares 810,444$10.8M7.43%-76,439Timeline
KKRKKR & CO INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 278,700 shares; 2024Q4: 266,700 shares; 2025Q1: 244,700 shares; 2025Q2: 234,700 shares; 2025Q3: 219,700 shares; 2025Q4: 190,100 shares; 2026Q1: 106,600 shares 106,600$9.86M6.78%-83,500Timeline
BURBURFORD CAPITAL LIMITEDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 1,622,622 shares; 2024Q4: 1,607,622 shares; 2025Q1: 1,607,622 shares; 2025Q2: 1,625,330 shares; 2025Q3: 1,602,812 shares; 2025Q4: 1,865,312 shares; 2026Q1: 2,140,312 shares 2,140,312$9.67M6.66%+275,000Timeline
ALLTALLOT LTDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 100,000 shares; 2025Q1: 168,298 shares; 2025Q2: 626,024 shares; 2025Q3: 759,643 shares; 2025Q4: 856,991 shares; 2026Q1: 1,266,991 shares 1,266,991$8.44M5.8%+410,000Timeline
NNNEXTNAV INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 60,000 shares; 2025Q2: 60,000 shares; 2025Q3: 60,000 shares; 2025Q4: 62,000 shares; 2026Q1: 349,333 shares 349,333$5.6M3.85%+287,333Timeline
ZMZOOM COMMUNICATIONS 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: 25,000 shares 25,000$2.01M1.38%newTimeline
MRLNMERLIN 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: 108,233 shares 108,233$796K0.55%newTimeline
INFLLISTED FDS 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: not reported; 2026Q1: 16,024 shares 16,024$529K0.36%newTimeline
MTRXMATRIX SVC COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 15,685 shares; 2024Q4: 13,931 shares; 2025Q1: 13,969 shares; 2025Q2: 13,969 shares; 2025Q3: 13,969 shares; 2025Q4: 13,969 shares; 2026Q1: 13,969 shares 13,969$160K0.11%0Timeline
PESIPERMA-FIX ENVIRONMENTAL SVCSQuarterly 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: 11,303 shares 11,303$120K0.08%newTimeline
RSSSRESEARCH SOLUTIONS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 36,326 shares; 2024Q4: 40,251 shares; 2025Q1: 37,743 shares; 2025Q2: 38,477 shares; 2025Q3: 38,477 shares; 2025Q4: 38,477 shares; 2026Q1: 38,477 shares 38,477$87K0.06%0Timeline
QRHCQUEST RESOURCE HLDG CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 11,054 shares; 2025Q1: 11,482 shares; 2025Q2: 12,976 shares; 2025Q3: 30,777 shares; 2025Q4: 31,463 shares; 2026Q1: 31,463 shares 31,463$37.4K0.03%0Timeline

Sold out in Q1 2026

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

SecurityShares beforeValue beforeType
TLTISHARES TR4,166,500$363Mput
LPXLOUISIANA PAC CORP101,323$8.18Mshares
PINSPINTEREST INC110,000$2.85Mshares

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 0001420506-26-001077 base2026-05-15acceptance time not in the bulk data set