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Super Investors 12th Street Asset Management Company, LLC
1S

12th Street Asset Management Company, LLC

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

Portfolio value
$702M
Positions
32
Quarter ended
June 30, 2026
Filed
August 13, 2026

Reported portfolio value by quarter (47 quarters reported)

$702M $159M
Q4 14 Q2 17 Q4 19 Q2 22 Q4 24 Q2 26

$231M in Q4 2014 → $702M 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
SS SPDR Ser Tr SPDR Bloomberg 7.3% Added 37% 562,486 $51.5M
Clean Harbors Inc 7.1% Trimmed 19% 166,534 $49.8M
PF Pinnacle Finl Partners Inc Com 6.2% Added 7.1% 430,655 $43.4M
KS Knight Swift Transn Hldgs Inc 6.1% Added 12% 548,785 $42.7M
Kirby Corp 5.7% Added 0.5% 292,564 $39.8M
CP Crh PLC Ord 5.1% Added 1.0% 335,850 $35.9M
SI Somnigroup International Inc C 4.6% Added 1.1% 412,964 $32.4M
Healthequity Inc 4.4% Added 37% 345,390 $31.2M
Brunswick Corp 4.4% Added 4.1% 366,273 $30.9M
Dell Technologies Inc 4.3% Trimmed 6.0% 70,617 $30.5M
DI Dycom Inds Inc 4.0% Trimmed 20% 55,105 $27.9M
RG Rb Global Inc Com Npv 3.7% Added 4.7% 222,228 $25.9M
Pool Corporation 3.5% New 114,637 $24.6M
Ciena Corp 3.3% Trimmed 26% 46,777 $22.9M
Autozone Inc 3.0% Trimmed 21% 6,582 $21M
ST Ssnc Technologies Hldgs Inc 3.0% New 335,218 $20.8M
GH Generac Hldgs Inc 2.8% Added 2.0% 68,264 $20M
Lkq Corp 2.7% Trimmed 48% 727,020 $19.1M
Masco Corp 2.3% Trimmed 10% 202,155 $16.4M
SG Stonex Group Inc Com 2.0% Trimmed 35% 120,677 $14.3M
MT Marten Trans Ltd 1.9% New 758,634 $13.2M
GC Granite Constr Inc 1.7% Added 24% 77,058 $12.2M
PO Progressive Corp Ohio 1.6% Added 1.0% 51,116 $11.2M
RE Rush Enterpises Inc 1.5% Trimmed 26% 144,300 $10.5M
FF Fb Finl Corp 1.4% Trimmed 30% 172,500 $9.55M
Diamondback Energy Inc 1.2% Added 0.8% 49,700 $8.74M
Siteone Landscape Supply Inc 1.2% New 75,475 $8.64M
CP Construction Partners Inc Com 0.9% Added 7.4% 55,366 $6.58M
Eagle Materials Inc 0.9% Trimmed 0.0% 27,092 $6.1M
LP Louisiana Pac Corp 0.8% Added 60% 68,586 $5.39M
IV I3 Verticals Inc Com Cl A 0.7% Trimmed 57% 223,881 $4.78M
HC Harrow Inc Com 0.6% Trimmed 46% 91,409 $3.88M

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 13, 2026

Company Action Shares changed Value of change % of portfolio
Pool Corporation New +114,637 +$24.6M 3.5%
ST Ssnc Technologies Hldgs Inc New +335,218 +$20.8M 3.0%
Lkq Corp Trimmed −657,788 −$17.3M 2.7%
FH First Horizon Natl Corp Exited −698,869 −$15.9M —
SS SPDR Ser Tr SPDR Bloomberg Added +152,724 +$14M 7.3%
MT Marten Trans Ltd New +758,634 +$13.2M 1.9%
Clean Harbors Inc Trimmed −38,182 −$11.4M 7.1%
Siteone Landscape Supply Inc New +75,475 +$8.64M 1.2%
Healthequity Inc Added +94,029 +$8.49M 4.4%
Ciena Corp Trimmed −16,710 −$8.2M 3.3%

Showing the 10 largest of 36 changes.

Q1 2026

quarter ended March 31, 2026 · filed May 12, 2026

Company Action Shares changed Value of change % of portfolio
Ciena Corp Trimmed −116,097 −$45.1M 4.0%
PF Pinnacle Finl Partners Inc Exited −416,090 −$39.7M —
PF Pinnacle Finl Partners Inc Com New +402,273 +$34.7M 5.7%
KS Knight Swift Transn Hldgs Inc Added +305,242 +$17.6M 4.6%
GH Generac Hldgs Inc New +66,910 +$13.1M 2.1%
AC Axalta Coating Sys Ltd Exited −228,528 −$7.38M —
RE Rush Enterpises Inc Added +85,923 +$5.68M 2.1%
SG Stonex Group Inc Com Added +62,724 +$5.06M 2.5%
HC Harrow Inc Com Added +77,608 +$2.74M 1.0%
Lkq Corp Added +83,977 +$2.47M 6.7%

Showing the 10 largest of 34 changes.

Q4 2025

quarter ended December 31, 2025 · filed February 09, 2026

Company Action Shares changed Value of change % of portfolio
FH First Horizon Natl Corp New +739,938 +$17.7M 2.9%
SS SPDR Ser Tr SPDR Bloomberg Trimmed −183,508 −$16.8M 6.2%
Kirby Corp Trimmed −143,304 −$15.8M 5.4%
AP Amcor PLC Ord Exited −1,633,539 −$13.4M —
RG Rb Global Inc Com Npv Added +102,004 +$10.5M 3.7%
Dell Technologies Inc New +76,242 +$9.6M 1.6%
PF Pinnacle Finl Partners Inc Added +97,040 +$9.26M 6.5%
Diamondback Energy Inc Trimmed −53,755 −$8.08M 1.2%
Lkq Corp Added +212,009 +$6.4M 6.5%
NO Northern Oil And Gas Inc Mn Co Exited −240,730 −$5.97M —

Showing the 10 largest of 34 changes.

Q3 2025

quarter ended September 30, 2025 · filed November 06, 2025

Company Action Shares changed Value of change % of portfolio
Ciena Corp Trimmed −193,156 −$28.1M 4.6%
GP Graphic Packaging Hldg Co Exited −824,146 −$17.4M —
Healthequity Inc Added +145,151 +$13.8M 4.4%
IV I3 Verticals Inc Com Cl A Added +375,240 +$12.2M 3.3%
AP Amcor PLC Ord Trimmed −1,215,351 −$9.94M 2.3%
SS SPDR Ser Tr SPDR Bloomberg Added +97,245 +$8.92M 9.2%
RG Rb Global Inc Com Npv Trimmed −63,239 −$6.85M 2.2%
GC Granite Constr Inc New +62,003 +$6.8M 1.2%
Brunswick Corp Added +102,985 +$6.51M 3.9%
DI Dycom Inds Inc Added +22,077 +$6.44M 3.3%

Showing the 10 largest of 31 changes.

Q2 2025

quarter ended June 30, 2025 · filed August 11, 2025

Company Action Shares changed Value of change % of portfolio
SS SPDR Ser Tr SPDR Bloomberg Trimmed −319,540 −$29.3M 7.8%
BG Berry Global Group Inc Com Exited −411,548 −$28.7M —
AP Amcor PLC Ord New +2,848,890 +$26.2M 4.5%
Brunswick Corp New +260,396 +$14.4M 2.5%
Healthequity Inc New +126,917 +$13.3M 2.3%
RG Rb Global Inc Com Npv Trimmed −86,990 −$9.24M 3.3%
Kirby Corp Added +80,086 +$9.08M 9.5%
PO Progressive Corp Ohio Trimmed −33,516 −$8.94M 3.0%
RE Rush Enterpises Inc Trimmed −137,994 −$7.11M 1.2%
IV I3 Verticals Inc Com Cl A New +234,702 +$6.45M 1.1%

Showing the 10 largest of 33 changes.

Q1 2025

quarter ended March 31, 2025 · filed May 08, 2025

Company Action Shares changed Value of change % of portfolio
SS SPDR Ser Tr SPDR Bloomberg Added +557,647 +$51.2M 12.8%
PI Ppg Inds Inc Exited −162,979 −$19.5M —
PS Primoris Svcs Corp Trimmed −212,406 −$12.2M 0.7%
American Homes 4 Rent Trimmed −266,834 −$10.1M 0.7%
Kirby Corp Added +87,646 +$8.85M 7.0%
Diamondback Energy Inc Added +50,615 +$8.09M 3.0%
RE Rush Enterpises Inc Trimmed −143,723 −$7.68M 2.4%
GP Graphic Packaging Hldg Co Trimmed −268,267 −$6.96M 3.8%
C Composecure Inc Exited −453,064 −$6.95M —
NO Northern Oil And Gas Inc Mn Co Trimmed −222,737 −$6.73M 1.1%

Showing the 10 largest of 32 changes.

Q4 2024

quarter ended December 31, 2024 · filed February 10, 2025

Company Action Shares changed Value of change % of portfolio
TP Tempur Pedic Intl Inc New +371,117 +$21M 3.5%
SS SPDR Ser Tr SPDR Bloomberg Trimmed −170,682 −$15.6M 3.9%
Fedex Corp Exited −46,409 −$12.7M —
RG Rb Global Inc Com Npv Added +114,304 +$10.3M 5.0%
C Composecure Inc New +453,064 +$6.95M 1.1%
GP Graphic Packaging Hldg Co Trimmed −255,218 −$6.93M 5.1%
Lkq Corp Trimmed −185,178 −$6.81M 5.8%
Ciena Corp Added +69,876 +$5.93M 4.3%
PF Pinnacle Finl Partners Inc Added +50,573 +$5.79M 5.7%
Acushnet Holdings Corp Added +76,126 +$5.41M 1.4%

Showing the 10 largest of 33 changes.

Q3 2024

quarter ended September 30, 2024 · filed November 12, 2024

Company Action Shares changed Value of change % of portfolio
Clean Harbors Inc Trimmed −72,021 −$17.4M 7.6%
Ciena Corp New +239,257 +$14.7M 2.5%
SS SPDR Ser Tr SPDR Bloomberg Trimmed −145,079 −$13.3M 6.7%
Visteon Corp Exited −124,137 −$13.2M —
Lkq Corp Added +289,579 +$11.6M 7.7%
GP Graphic Packaging Hldg Co Trimmed −179,277 −$5.3M 6.9%
American Homes 4 Rent Added +78,295 +$3.01M 2.5%
Kirby Corp Added +22,252 +$2.72M 6.6%
Diamondback Energy Inc Added +15,726 +$2.71M 1.5%
CP Crh PLC Ord Added +24,778 +$2.3M 5.7%

Showing the 10 largest of 31 changes.

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