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IRIDIAN ASSET MANAGEMENT LLC/CT

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13F filer, CIK 1033427, WESTPORT, CT

IRIDIAN ASSET MANAGEMENT LLC/CT reported $246,697,828 across 42 holdings for the quarter ended 2026-03-31, in a 13F-HR filed 2026-04-24. Its ten largest share positions make up 62.38% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001033427-26-000004

Period
2026-03-31
Reported value
$247M
Holdings
42
Top 10 weight
62.38%
New
5
Sold out
6

Stakes and trades reported after 2026-03-31

13D, 13G and Form 4 filings by this filer's group, dated after the 13F period, on securities the quarter does not hold as shares.

  • KATAPULT HOLDINGS INC: 13G/A 919,498 shares, 1.1% of the class, 13G/A filed 2026-10-01, 0001033427-26-000012
    Accepted , ingested

Largest buys vs the previous quarter

SecurityShares changeApprox. value
ACVAadded+2,211,357$9.38M
LADadded+18,405$4.6M
BRBRnew+222,945$3.59M
ENRadded+110,222$1.81M
NKTRadded+21,592$1.55M

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
DBRGreduced-360,253-$5.56M
AVADEL PHARMACEUTICALSexited-247,086-$5.32M
BALLreduced-87,759-$5.19M
RTOreduced-117,582-$3.7M
HLFreduced-214,763-$3.16M

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 0001033427-26-000004, largest first. % of portfolio is the value over $246,697,828, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
HLFHERBALIFE LTDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 2,228,193 shares; 2024Q4: 2,507,740 shares; 2025Q1: 2,775,430 shares; 2025Q2: 2,228,259 shares; 2025Q3: 2,449,155 shares; 2025Q4: 1,836,381 shares; 2026Q1: 1,621,618 shares 1,621,618$23.9M9.68%-214,763Timeline
ACVAACV AUCTIONS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 1,062,081 shares; 2024Q4: 1,106,154 shares; 2025Q1: 1,967,332 shares; 2025Q2: 1,231,493 shares; 2025Q3: 1,880,851 shares; 2025Q4: 2,989,152 shares; 2026Q1: 5,200,509 shares 5,200,509$22.1M8.94%+2,211,357Timeline
HGVHILTON GRAND VACATIONS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 311,673 shares; 2024Q4: 299,963 shares; 2025Q1: 289,601 shares; 2025Q2: 198,602 shares; 2025Q3: 274,055 shares; 2025Q4: 464,964 shares; 2026Q1: 485,200 shares 485,200$19M7.69%+20,236Timeline
POSTPOST HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 171,188 shares; 2024Q4: 206,013 shares; 2025Q1: 173,674 shares; 2025Q2: 139,955 shares; 2025Q3: 119,081 shares; 2025Q4: 169,125 shares; 2026Q1: 181,969 shares 181,969$18M7.29%+12,844Timeline
LADLITHIA MTRS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 65,641 shares; 2024Q4: 53,849 shares; 2025Q1: 61,424 shares; 2025Q2: 53,371 shares; 2025Q3: 47,298 shares; 2025Q4: 47,182 shares; 2026Q1: 65,587 shares 65,587$16.4M6.64%+18,405Timeline
PGENPRECIGEN INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 3,775,960 shares; 2024Q4: 5,241,922 shares; 2025Q1: 4,585,809 shares; 2025Q2: 4,278,662 shares; 2025Q3: 3,666,946 shares; 2025Q4: 3,600,195 shares; 2026Q1: 3,592,730 shares 3,592,730$13.9M5.64%-7,465Timeline
TNLTRAVEL PLUS LEISURE COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 534,156 shares; 2024Q4: 503,893 shares; 2025Q1: 477,224 shares; 2025Q2: 438,650 shares; 2025Q3: 305,415 shares; 2025Q4: 209,844 shares; 2026Q1: 196,953 shares 196,953$13.6M5.52%-12,891Timeline
AXSMAXSOME THERAPEUTICS INC.Quarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 126,803 shares; 2024Q4: 125,079 shares; 2025Q1: 106,312 shares; 2025Q2: 91,761 shares; 2025Q3: 83,553 shares; 2025Q4: 73,783 shares; 2026Q1: 67,491 shares 67,491$11.4M4.62%-6,292Timeline
ESIELEMENT SOLUTIONS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 290,769 shares; 2024Q4: 258,845 shares; 2025Q1: 259,065 shares; 2025Q2: 210,724 shares; 2025Q3: 192,525 shares; 2025Q4: 264,211 shares; 2026Q1: 236,342 shares 236,342$8.07M3.27%-27,869Timeline
BILLBILL HOLDINGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 294,668 shares; 2024Q4: 53,705 shares; 2025Q1: 109,849 shares; 2025Q2: 144,427 shares; 2025Q3: 151,554 shares; 2025Q4: 187,404 shares; 2026Q1: 198,745 shares 198,745$7.61M3.09%+11,341Timeline
KPLTKATAPULT HOLDINGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 400,000 shares; 2024Q4: 438,000 shares; 2025Q1: 576,648 shares; 2025Q2: 564,844 shares; 2025Q3: 308,616 shares; 2025Q4: 920,000 shares; 2026Q1: 897,117 shares 897,117$6.33M2.57%-22,883Timeline
ELVELEVANCE HEALTH INC FORMERLYQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 39,154 shares; 2024Q4: 60,197 shares; 2025Q1: 51,991 shares; 2025Q2: 46,622 shares; 2025Q3: 52,103 shares; 2025Q4: 25,074 shares; 2026Q1: 21,625 shares 21,625$6.33M2.57%-3,449Timeline
RTORENTOKIL INITIAL PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 719,795 shares; 2024Q4: 728,764 shares; 2025Q1: 828,361 shares; 2025Q2: 697,212 shares; 2025Q3: 614,609 shares; 2025Q4: 306,397 shares; 2026Q1: 188,815 shares 188,815$5.94M2.41%-117,582Timeline
LPLALPL FINL HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 82,834 shares; 2024Q4: 28,902 shares; 2025Q1: 20,901 shares; 2025Q2: 13,937 shares; 2025Q3: 13,847 shares; 2025Q4: 14,385 shares; 2026Q1: 19,518 shares 19,518$5.87M2.38%+5,133Timeline
ONON SEMICONDUCTOR CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 90,709 shares; 2024Q4: 88,355 shares; 2025Q1: 105,460 shares; 2025Q2: 69,740 shares; 2025Q3: 62,854 shares; 2025Q4: 91,632 shares; 2026Q1: 87,878 shares 87,878$5.44M2.21%-3,754Timeline
NVCTNUVECTIS PHARMA INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 55,380 shares; 2024Q4: not reported; 2025Q1: 253,972 shares; 2025Q2: 372,717 shares; 2025Q3: 405,621 shares; 2025Q4: 586,320 shares; 2026Q1: 651,757 shares 651,757$5.04M2.04%+65,437Timeline
NESRNATIONAL ENERGY SERVICES REUQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 153,836 shares; 2025Q1: 273,944 shares; 2025Q2: 224,765 shares; 2025Q3: 252,754 shares; 2025Q4: 240,383 shares; 2026Q1: 234,476 shares 234,476$5.03M2.04%-5,907Timeline
FLEXFLEX LTDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 533,225 shares; 2024Q4: 146,884 shares; 2025Q1: 104,144 shares; 2025Q2: 100,290 shares; 2025Q3: 78,916 shares; 2025Q4: 69,932 shares; 2026Q1: 73,216 shares 73,216$4.79M1.94%+3,284Timeline
CCKCROWN HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 195,849 shares; 2024Q4: 222,292 shares; 2025Q1: 197,782 shares; 2025Q2: 82,664 shares; 2025Q3: 56,650 shares; 2025Q4: 60,365 shares; 2026Q1: 47,536 shares 47,536$4.77M1.93%-12,829Timeline
CLVTCLARIVATE PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 1,045,679 shares; 2024Q4: 1,120,550 shares; 2025Q1: 1,152,149 shares; 2025Q2: 905,076 shares; 2025Q3: 1,002,958 shares; 2025Q4: 1,528,410 shares; 2026Q1: 1,787,943 shares 1,787,943$4.52M1.83%+259,533Timeline
BRBRBELLRING BRANDS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 56,758 shares; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 222,945 shares 222,945$3.59M1.45%newTimeline
GENGEN DIGITAL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 482,450 shares; 2024Q4: 441,492 shares; 2025Q1: 413,578 shares; 2025Q2: 231,511 shares; 2025Q3: 193,957 shares; 2025Q4: 190,232 shares; 2026Q1: 189,323 shares 189,323$3.56M1.45%-909Timeline
ENRENERGIZER 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: 95,539 shares; 2026Q1: 205,761 shares 205,761$3.38M1.37%+110,222Timeline
BKRBAKER HUGHES COMPANYQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 145,094 shares; 2024Q4: 78,958 shares; 2025Q1: 70,026 shares; 2025Q2: 73,826 shares; 2025Q3: 63,016 shares; 2025Q4: 57,686 shares; 2026Q1: 49,320 shares 49,320$3.01M1.22%-8,366Timeline
KKRKKR & CO INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 27,084 shares; 2024Q4: 20,825 shares; 2025Q1: 20,015 shares; 2025Q2: 18,285 shares; 2025Q3: 16,405 shares; 2025Q4: 17,258 shares; 2026Q1: 31,363 shares 31,363$2.9M1.18%+14,105Timeline
SLBSLB LIMITEDQuarterly 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: 60,916 shares; 2025Q4: 55,494 shares; 2026Q1: 52,950 shares 52,950$2.72M1.1%-2,544Timeline
TGTXTG THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 47,532 shares; 2024Q4: 47,532 shares; 2025Q1: 47,532 shares; 2025Q2: 47,532 shares; 2025Q3: 75,289 shares; 2025Q4: 75,289 shares; 2026Q1: 75,289 shares 75,289$2.5M1.01%0Timeline
ICEINTERCONTINENTAL EXCHANGE INQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 24,477 shares; 2024Q4: 22,364 shares; 2025Q1: 16,117 shares; 2025Q2: 11,493 shares; 2025Q3: 10,062 shares; 2025Q4: 16,166 shares; 2026Q1: 15,515 shares 15,515$2.44M0.99%-651Timeline
NKTRNEKTAR THERAPEUTICSQuarterly 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: 9,728 shares; 2026Q1: 31,320 shares 31,320$2.25M0.91%+21,592Timeline
QSRRESTAURANT BRANDS INTL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 61,838 shares; 2024Q4: 107,983 shares; 2025Q1: 115,870 shares; 2025Q2: 46,615 shares; 2025Q3: 47,389 shares; 2025Q4: 36,710 shares; 2026Q1: 29,819 shares 29,819$2.2M0.89%-6,891Timeline
BALLBALL CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 22,971 shares; 2025Q2: 26,848 shares; 2025Q3: 46,624 shares; 2025Q4: 122,835 shares; 2026Q1: 35,076 shares 35,076$2.07M0.84%-87,759Timeline
CRLCHARLES RIV LABS INTL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 55,043 shares; 2024Q4: 50,965 shares; 2025Q1: 60,419 shares; 2025Q2: 47,566 shares; 2025Q3: 28,626 shares; 2025Q4: 26,568 shares; 2026Q1: 9,845 shares 9,845$1.7M0.69%-16,723Timeline
MOHMOLINA HEALTHCARE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 2,522 shares; 2024Q4: 2,522 shares; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 9,557 shares; 2025Q4: 8,200 shares; 2026Q1: 7,830 shares 7,830$1.04M0.42%-370Timeline
YOUCLEAR SECURE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 164,572 shares; 2024Q4: 180,175 shares; 2025Q1: 167,737 shares; 2025Q2: 172,858 shares; 2025Q3: 47,687 shares; 2025Q4: 43,902 shares; 2026Q1: 21,478 shares 21,478$1.04M0.42%-22,424Timeline
RHRHQuarterly 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: 2,995 shares; 2026Q1: 6,067 shares 6,067$848K0.34%+3,072Timeline
LHLABCORP HOLDINGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 22,216 shares; 2024Q4: 20,495 shares; 2025Q1: 4,223 shares; 2025Q2: 3,907 shares; 2025Q3: 3,993 shares; 2025Q4: 3,644 shares; 2026Q1: 2,827 shares 2,827$754K0.31%-817Timeline
ZZILLOW GROUP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 6,286 shares; 2024Q4: 6,166 shares; 2025Q1: 5,816 shares; 2025Q2: 4,571 shares; 2025Q3: 3,952 shares; 2025Q4: 3,682 shares; 2026Q1: 18,040 shares 18,040$746K0.3%+14,358Timeline
AMRZAMRIZE 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: not reported; 2026Q1: 12,459 shares 12,459$698K0.28%newTimeline
DBRGDIGITALBRIDGE GROUP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 387,827 shares; 2024Q4: 365,504 shares; 2025Q1: 393,723 shares; 2025Q2: 351,017 shares; 2025Q3: 399,393 shares; 2025Q4: 399,771 shares; 2026Q1: 39,518 shares 39,518$609K0.25%-360,253Timeline
ELTXELICIO THERAPEUTICS 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: 30,051 shares 30,051$321K0.13%newTimeline
BCTXBRIACELL THERAPEUTICS 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: 65,000 shares 65,000$272K0.11%newTimeline
BCTXLBRIACELL THERAPEUTICS 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: 65,000 shares 65,000$67K0.03%newTimeline

Sold out in Q1 2026

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

SecurityShares beforeValue beforeType
AVADEL PHARMACEUTICALSAVADEL PHARMACEUTICALS247,086$5.32Mshares
GTLSCHART INDS INC6,326$1.3Mshares
GBTCGRAYSCALE BITCOIN TRUST ETF10,559$722Kshares
IWRISHARES TR5,220$503Kshares
ALITALIGHT INC218,252$426Kshares
CLNECLEAN ENERGY FUELS CORP141,549$297Kshares

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 0001033427-26-000004 base2026-04-24acceptance time not in the bulk data set