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Super Investors SOUTHERNSUN ASSET MANAGEMENT, LLC
SA

SOUTHERNSUN ASSET MANAGEMENT, LLC

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$743M
Positions
29
Quarter ended
June 30, 2026
Filed
August 14, 2026

Reported portfolio value by quarter (53 quarters reported)

$5.52B $676M
Q2 13 Q1 16 Q4 18 Q3 21 Q2 24 Q2 26

$3.29B in Q2 2013 → $743M now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
Extreme Networks 7.3% Trimmed 27% 1,685,450 $54.6M
Louisiana-pacific Corp 6.1% Added 19% 577,698 $45.4M
Boot Barn Holdings Inc 5.9% Trimmed 1.4% 268,599 $44.1M
Murphy Usa Inc. 5.8% Trimmed 5.7% 79,962 $43.1M
Crane Nxt 5.7% Added 5.8% 829,182 $42.4M
Darling Ingredients Inc. 5.6% Trimmed 2.2% 763,305 $41.7M
Live Oak Bancshares Inc 5.1% Trimmed 9.6% 934,751 $38.2M
Agco Corp. 4.9% Added 24% 305,473 $36.6M
Us Physical Therapy Inc 4.9% Added 20% 527,765 $36.2M
Dorman Products Inc 4.8% Added 6.8% 263,383 $35.9M
Msa Safety Inc 4.7% Added 17% 199,654 $34.9M
Armstrong World Industries Inc 4.3% Added 19% 200,875 $32.2M
Enerpac Tool Group 4.1% Added 28% 850,182 $30.5M
The Brink's Co. 4.1% Added 1.2% 320,542 $30.3M
Csw Industrials 3.5% Added 7.2% 94,698 $26.4M
The Boston Beer Co Inc 3.1% Added 76% 131,877 $23.3M
Modine Manufacturing Co 2.8% Trimmed 31% 76,603 $20.5M
Ingevity Corp 2.5% Trimmed 2.7% 244,260 $18.2M
Thor Industries Inc. 2.4% Added 82% 238,971 $18M
Kadant Inc 2.1% Added 13% 48,681 $15.3M
Advanced Energy Industries Inc 1.9% Trimmed 18% 38,683 $14.4M
Generac Holdings Inc 1.6% Trimmed 17% 40,377 $11.8M
Api Group 1.4% Trimmed 4.1% 244,797 $10.4M
Valmont Industries Inc 1.1% Trimmed 18% 13,601 $7.86M
Watsco Inc 1.0% Trimmed 4.3% 17,853 $7.44M
Oshkosh Corp 0.9% Added 40% 43,332 $6.65M
Broadridge Financial Solutions 0.8% Trimmed 4.1% 43,396 $5.94M
Sei Investments Co 0.8% Trimmed 5.5% 63,671 $5.58M
Floor & Decor Holdings 0.7% Trimmed 4.2% 83,711 $4.97M

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q2 2026

quarter ended June 30, 2026 · filed August 14, 2026

Company Action Shares changed Value of change % of portfolio
Belden Inc Exited −258,377 −$29.7M —
Extreme Networks Trimmed −612,483 −$19.8M 7.3%
Stepan Co Exited −378,799 −$18.9M —
The Boston Beer Co Inc Added +57,061 +$10.1M 3.1%
Modine Manufacturing Co Trimmed −33,683 −$8.99M 2.8%
Thor Industries Inc. Added +107,864 +$8.11M 2.4%
Louisiana-pacific Corp Added +91,829 +$7.22M 6.1%
Agco Corp. Added +58,197 +$6.97M 4.9%
Enerpac Tool Group Added +185,308 +$6.65M 4.1%
Us Physical Therapy Inc Added +87,861 +$6.03M 4.9%

Showing the 10 largest of 31 changes.

Q1 2026

quarter ended March 31, 2026 · filed May 13, 2026

Company Action Shares changed Value of change % of portfolio
Modine Manufacturing Co Trimmed −138,122 −$29.9M 3.5%
Advanced Energy Industries Inc Trimmed −76,342 −$24.6M 2.2%
Darling Ingredients Inc. Trimmed −354,737 −$21.9M 7.0%
Boot Barn Holdings Inc Added +79,127 +$11.6M 5.8%
The Brink's Co. Trimmed −99,349 −$10.3M 4.8%
Dorman Products Inc Added +55,948 +$5.84M 3.7%
Csw Industrials Added +21,588 +$5.63M 3.3%
Extreme Networks Added +327,047 +$4.93M 5.0%
Crane Nxt Added +115,598 +$4.69M 4.6%
Murphy Usa Inc. Trimmed −7,531 −$3.72M 6.1%

Showing the 10 largest of 32 changes.

Q4 2025

quarter ended December 31, 2025 · filed February 13, 2026

Company Action Shares changed Value of change % of portfolio
Timken Co. Exited −370,037 −$27.8M —
Csw Industrials New +66,748 +$19.6M 2.7%
Kadant Inc New +45,033 +$12.8M 1.8%
Dycom Industries Inc Exited −41,027 −$12M —
Extreme Networks Added +629,486 +$10.5M 4.6%
Advanced Energy Industries Inc Trimmed −48,180 −$10.1M 3.6%
Ingevity Corp Trimmed −160,701 −$9.51M 2.3%
The Brink's Co. Trimmed −63,207 −$7.38M 6.8%
Crane Nxt Added +116,027 +$5.46M 4.4%
Live Oak Bancshares Inc Added +134,798 +$4.63M 4.9%

Showing the 10 largest of 35 changes.

Q3 2025

quarter ended September 30, 2025 · filed November 14, 2025

Company Action Shares changed Value of change % of portfolio
Crane Nxt Added +231,894 +$15.6M 4.8%
Agco Corp. Trimmed −95,986 −$10.3M 3.6%
Dycom Industries Inc Trimmed −33,635 −$9.81M 1.6%
Murphy Usa Inc. Added +21,041 +$8.17M 4.8%
Boot Barn Holdings Inc Trimmed −47,019 −$7.79M 4.6%
Enerpac Tool Group Added +139,891 +$5.74M 3.4%
Ingevity Corp Trimmed −96,261 −$5.31M 3.1%
Msa Safety Inc Added +30,208 +$5.2M 3.8%
Extreme Networks Added +224,397 +$4.63M 3.6%
Dorman Products Inc Trimmed −27,566 −$4.3M 4.0%

Showing the 10 largest of 31 changes.

Q2 2025

quarter ended June 30, 2025 · filed August 14, 2025

Company Action Shares changed Value of change % of portfolio
Dycom Industries Inc Trimmed −105,030 −$25.7M 2.6%
Msa Safety Inc New +139,805 +$23.4M 3.3%
Crane Nxt New +320,289 +$17.3M 2.4%
Oxford Industries Inc Exited −294,090 −$17.3M —
Belden Inc Trimmed −124,059 −$14.4M 5.2%
Boot Barn Holdings Inc Trimmed −85,632 −$13M 5.6%
Extreme Networks Added +532,582 +$9.56M 2.8%
Armstrong World Industries Inc Trimmed −57,114 −$9.28M 4.0%
Enerpac Tool Group Trimmed −205,083 −$8.32M 2.8%
The Brink's Co. Trimmed −84,510 −$7.55M 6.1%

Showing the 10 largest of 32 changes.

Q1 2025

quarter ended March 31, 2025 · filed May 14, 2025

Company Action Shares changed Value of change % of portfolio
Modine Manufacturing Co New +235,344 +$18.1M 2.6%
Polaris Inc Exited −284,957 −$16.4M —
Extreme Networks New +584,421 +$7.73M 1.1%
Dycom Industries Inc Trimmed −43,318 −$6.6M 4.0%
Enerpac Tool Group Trimmed −146,179 −$6.56M 4.5%
Timken Co. Trimmed −72,877 −$5.24M 4.7%
Boot Barn Holdings Inc Added +47,999 +$5.16M 5.4%
Darling Ingredients Inc. Trimmed −129,721 −$4.05M 6.5%
Dorman Products Inc Trimmed −30,755 −$3.71M 3.9%
Advanced Energy Industries Inc Added +34,696 +$3.31M 2.1%

Showing the 10 largest of 32 changes.

Q4 2024

quarter ended December 31, 2024 · filed February 14, 2025

Company Action Shares changed Value of change % of portfolio
Mgp Ingredients Inc Exited −658,317 −$54.8M —
OI Oxford Inds Inc New +257,787 +$20.3M 2.5%
AE Advanced Energy Inds Added +81,697 +$9.45M 1.7%
BC Brinks Co Added +79,701 +$7.39M 6.9%
DP Dorman Prods Inc Trimmed −47,667 −$6.18M 4.1%
BB Boot Barn Hldgs Inc Added +38,739 +$5.88M 5.7%
Stepan Co Added +74,238 +$4.8M 3.1%
Enerpac Tool Group Corp Trimmed −114,992 −$4.73M 4.3%
Polaris Inc Added +52,988 +$3.05M 2.0%
Live Oak Bancshares Inc Added +74,193 +$2.93M 3.9%

Showing the 10 largest of 31 changes.

Q3 2024

quarter ended September 30, 2024 · filed November 14, 2024

Company Action Shares changed Value of change % of portfolio
Boot Barn Holdings Inc Trimmed −130,250 −$21.8M 5.2%
Dycom Industries Inc Trimmed −89,412 −$17.6M 5.5%
Thor Industries Inc. Trimmed −92,278 −$10.1M 2.2%
Polaris Inc. Trimmed −106,340 −$8.85M 2.3%
Generac Holdings Inc New +41,267 +$6.56M 0.8%
The Boston Beer Co Inc Trimmed −22,554 −$6.52M 4.1%
Enerpac Tool Group Trimmed −155,065 −$6.5M 4.8%
Louisiana-pacific Corp Trimmed −57,760 −$6.21M 6.1%
The Brink's Co. Added +51,128 +$5.91M 7.1%
Darling Ingredients Inc. Added +154,038 +$5.72M 6.6%

Showing the 10 largest of 30 changes.

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