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SOUTHERNSUN ASSET MANAGEMENT, LLC

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13F filer, CIK 1089755, Memphis, TN

SOUTHERNSUN ASSET MANAGEMENT, LLC reported $689,910,992 across 31 holdings for the quarter ended 2026-03-31, in a 13F-HR filed 2026-05-13. Its ten largest share positions make up 52.39% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001213900-26-055668

Period
2026-03-31
Reported value
$690M
Holdings
31
Top 10 weight
52.39%
New
0
Sold out
1

Largest buys vs the previous quarter

SecurityShares changeApprox. value
BOOTadded+79,127$11.6M
DORMadded+55,948$5.84M
CSWadded+21,588$5.63M
EXTRadded+327,047$4.93M
CXTadded+115,598$4.69M

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
MODreduced-138,122-$29.9M
AEISreduced-76,342-$24.6M
DARreduced-354,737-$21.9M
BCOreduced-99,349-$10.3M
MUSAreduced-7,531-$3.72M

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 0001213900-26-055668, largest first. % of portfolio is the value over $689,910,992, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
DARDARLING INGREDIENTS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 1,487,458 shares; 2024Q4: 1,567,052 shares; 2025Q1: 1,437,331 shares; 2025Q2: 1,316,772 shares; 2025Q3: 1,189,850 shares; 2025Q4: 1,134,847 shares; 2026Q1: 780,110 shares 780,110$48.2M6.99%-354,737Timeline
MUSAMURPHY USA INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 67,774 shares; 2024Q4: 69,806 shares; 2025Q1: 65,857 shares; 2025Q2: 74,908 shares; 2025Q3: 95,949 shares; 2025Q4: 92,328 shares; 2026Q1: 84,797 shares 84,797$41.9M6.07%-7,531Timeline
BOOTBOOT BARN HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 262,250 shares; 2024Q4: 300,989 shares; 2025Q1: 348,988 shares; 2025Q2: 263,356 shares; 2025Q3: 216,337 shares; 2025Q4: 193,221 shares; 2026Q1: 272,348 shares 272,348$39.9M5.78%+79,127Timeline
LPXLOUISIANA PAC CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 478,906 shares; 2024Q4: 484,363 shares; 2025Q1: 458,091 shares; 2025Q2: 433,260 shares; 2025Q3: 428,042 shares; 2025Q4: 457,254 shares; 2026Q1: 485,869 shares 485,869$35.3M5.12%+28,615Timeline
EXTREXTREME NETWORKS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 584,421 shares; 2025Q2: 1,117,003 shares; 2025Q3: 1,341,400 shares; 2025Q4: 1,970,886 shares; 2026Q1: 2,297,933 shares 2,297,933$34.7M5.02%+327,047Timeline
LOBLIVE OAK BANCSHARES INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 722,527 shares; 2024Q4: 796,720 shares; 2025Q1: 871,934 shares; 2025Q2: 899,729 shares; 2025Q3: 894,310 shares; 2025Q4: 1,029,108 shares; 2026Q1: 1,033,539 shares 1,033,539$34.2M4.95%+4,431Timeline
USPHU S PHYSICAL THERAPYQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 547,111 shares; 2024Q4: 571,809 shares; 2025Q1: 543,812 shares; 2025Q2: 507,841 shares; 2025Q3: 505,222 shares; 2025Q4: 479,536 shares; 2026Q1: 439,904 shares 439,904$33M4.78%-39,632Timeline
BCOBRINKS COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 517,932 shares; 2024Q4: 597,633 shares; 2025Q1: 569,730 shares; 2025Q2: 485,220 shares; 2025Q3: 479,199 shares; 2025Q4: 415,992 shares; 2026Q1: 316,643 shares 316,643$32.8M4.76%-99,349Timeline
CXTCRANE NXT COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: 320,289 shares; 2025Q3: 552,183 shares; 2025Q4: 668,210 shares; 2026Q1: 783,808 shares 783,808$31.8M4.61%+115,598Timeline
BDCBELDEN INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 474,294 shares; 2024Q4: 474,910 shares; 2025Q1: 444,475 shares; 2025Q2: 320,416 shares; 2025Q3: 292,409 shares; 2025Q4: 280,976 shares; 2026Q1: 258,377 shares 258,377$29.7M4.3%-22,599Timeline
AGCOAGCO CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 386,444 shares; 2024Q4: 409,957 shares; 2025Q1: 399,774 shares; 2025Q2: 351,879 shares; 2025Q3: 255,893 shares; 2025Q4: 270,075 shares; 2026Q1: 247,276 shares 247,276$28.7M4.15%-22,799Timeline
MSAMSA SAFETY 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: 139,805 shares; 2025Q3: 170,013 shares; 2025Q4: 185,667 shares; 2026Q1: 170,520 shares 170,520$28M4.05%-15,147Timeline
AWIARMSTRONG WORLD INDS INC NEWQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 247,543 shares; 2024Q4: 248,807 shares; 2025Q1: 234,035 shares; 2025Q2: 176,921 shares; 2025Q3: 174,717 shares; 2025Q4: 166,745 shares; 2026Q1: 168,278 shares 168,278$27.7M4.02%+1,533Timeline
DORMDORMAN PRODS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 301,012 shares; 2024Q4: 253,345 shares; 2025Q1: 222,590 shares; 2025Q2: 227,925 shares; 2025Q3: 200,359 shares; 2025Q4: 190,573 shares; 2026Q1: 246,521 shares 246,521$25.7M3.73%+55,948Timeline
EPACENERPAC TOOL GROUP CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 958,386 shares; 2024Q4: 843,394 shares; 2025Q1: 697,215 shares; 2025Q2: 492,132 shares; 2025Q3: 632,023 shares; 2025Q4: 600,682 shares; 2026Q1: 664,874 shares 664,874$24.2M3.51%+64,192Timeline
MODMODINE MFG COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 235,344 shares; 2025Q2: 276,969 shares; 2025Q3: 275,633 shares; 2025Q4: 248,408 shares; 2026Q1: 110,286 shares 110,286$23.9M3.46%-138,122Timeline
CSWCSW INDUSTRIALS 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: 66,748 shares; 2026Q1: 88,336 shares 88,336$23M3.34%+21,588Timeline
SCLSTEPAN COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 309,447 shares; 2024Q4: 383,685 shares; 2025Q1: 376,009 shares; 2025Q2: 406,011 shares; 2025Q3: 446,656 shares; 2025Q4: 407,767 shares; 2026Q1: 378,799 shares 378,799$18.9M2.74%-28,968Timeline
NGVTINGEVITY CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 673,319 shares; 2024Q4: 686,490 shares; 2025Q1: 612,146 shares; 2025Q2: 529,967 shares; 2025Q3: 433,706 shares; 2025Q4: 273,005 shares; 2026Q1: 251,051 shares 251,051$17.9M2.59%-21,954Timeline
SAMBOSTON BEER INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 120,108 shares; 2024Q4: 121,972 shares; 2025Q1: 110,427 shares; 2025Q2: 91,627 shares; 2025Q3: 90,168 shares; 2025Q4: 75,524 shares; 2026Q1: 74,816 shares 74,816$17.2M2.5%-708Timeline
AEISADVANCED ENERGY INDSQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 33,971 shares; 2024Q4: 115,668 shares; 2025Q1: 150,364 shares; 2025Q2: 196,636 shares; 2025Q3: 171,630 shares; 2025Q4: 123,450 shares; 2026Q1: 47,108 shares 47,108$15.2M2.2%-76,342Timeline
KAIKADANT 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: 45,033 shares; 2026Q1: 43,018 shares 43,018$12.6M1.82%-2,015Timeline
THOTHOR INDS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 165,953 shares; 2024Q4: 172,365 shares; 2025Q1: 162,215 shares; 2025Q2: 154,286 shares; 2025Q3: 151,020 shares; 2025Q4: 142,474 shares; 2026Q1: 131,107 shares 131,107$10.5M1.52%-11,367Timeline
APGAPI GROUP CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 165,978 shares; 2024Q4: 185,023 shares; 2025Q1: 185,388 shares; 2025Q2: 196,864 shares; 2025Q3: 284,682 shares; 2025Q4: 252,771 shares; 2026Q1: 255,298 shares 255,298$10.3M1.5%+2,527Timeline
GNRCGENERAC HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 41,267 shares; 2024Q4: 44,568 shares; 2025Q1: 50,597 shares; 2025Q2: 61,094 shares; 2025Q3: 49,187 shares; 2025Q4: 55,717 shares; 2026Q1: 48,743 shares 48,743$9.52M1.38%-6,974Timeline
BRBROADRIDGE FINL SOLUTIONS INQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 48,177 shares; 2024Q4: 48,729 shares; 2025Q1: 47,444 shares; 2025Q2: 46,768 shares; 2025Q3: 44,798 shares; 2025Q4: 44,800 shares; 2026Q1: 45,254 shares 45,254$7.35M1.07%+454Timeline
WSOWATSCO INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 16,489 shares; 2024Q4: 16,680 shares; 2025Q1: 14,263 shares; 2025Q2: 14,334 shares; 2025Q3: 16,256 shares; 2025Q4: 18,458 shares; 2026Q1: 18,646 shares 18,646$6.78M0.98%+188Timeline
VMIVALMONT INDS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 20,946 shares; 2024Q4: 21,188 shares; 2025Q1: 21,224 shares; 2025Q2: 23,866 shares; 2025Q3: 22,770 shares; 2025Q4: 20,228 shares; 2026Q1: 16,597 shares 16,597$6.63M0.96%-3,631Timeline
SEICSEI INVTS COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 65,581 shares; 2024Q4: 66,649 shares; 2025Q1: 66,836 shares; 2025Q2: 66,950 shares; 2025Q3: 66,497 shares; 2025Q4: 66,490 shares; 2026Q1: 67,403 shares 67,403$5.29M0.77%+913Timeline
OSKOSHKOSH 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: 20,156 shares; 2026Q1: 30,980 shares 30,980$4.56M0.66%+10,824Timeline
FNDFLOOR & DECOR HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 37,566 shares; 2024Q4: 42,518 shares; 2025Q1: 50,361 shares; 2025Q2: 69,252 shares; 2025Q3: 66,383 shares; 2025Q4: 75,517 shares; 2026Q1: 87,374 shares 87,374$4.44M0.64%+11,857Timeline

Sold out in Q1 2026

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

SecurityShares beforeValue beforeType
IWMISHARES TR8,800$2.17Mshares

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 0001213900-26-055668 base2026-05-13acceptance time not in the bulk data set