William Blair & Company
MRTN icon

William Blair & Company’s Marten Transport MRTN Stock Holding History

William Blair & Company’s Portfolio MRTN Stock Details MRTN Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$299K Hold
22,800
– – ﹤0.01% 1337
2025
Q4 		$259K Hold
22,800
– – ﹤0.01% 1363
2025
Q3 		$243K Hold
22,800
– – ﹤0.01% 1390
2025
Q2 		$296K Hold
22,800
– – ﹤0.01% 1270
2025
Q1 		$313K Hold
22,800
– – ﹤0.01% 1244
2024
Q4 		$356K Hold
22,800
– – ﹤0.01% 1216
2024
Q3 		$404K Hold
22,800
– – ﹤0.01% 1186
2024
Q2 		$421K Sell
22,800
-93
-0.4% -$1.63K ﹤0.01% 1148
2024
Q1 		$423K Buy
22,893
+93
+0.4% +$1.79K ﹤0.01% 1130
2023
Q4 		$478K Hold
22,800
– – ﹤0.01% 1083
2023
Q3 		$449K Hold
22,800
– – ﹤0.01% 1092
2023
Q2 		$490K Hold
22,800
– – ﹤0.01% 1059
2023
Q1 		$478K Hold
22,800
– – ﹤0.01% 1065
2022
Q4 		$451K Hold
22,800
– – ﹤0.01% 1074
2022
Q3 		$437K Hold
22,800
– – ﹤0.01% 1090
2022
Q2 		$383K Sell
22,800
-95
-0.4% -$1.63K ﹤0.01% 1164
2022
Q1 		$407K Buy
22,895
+95
+0.4% +$1.66K ﹤0.01% 1241
2021
Q4 		$391K Hold
22,800
– – ﹤0.01% 1312
2021
Q3 		$358K Buy
+22,800
New +$358K ﹤0.01% 1284

Other funds holding MRTN

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
NI
Nuance Investments Kansas City, Missouri $717M AUM 3.8% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $95.5B AUM 28.4% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $124B AUM 33.93% 1-Year Est. Return

William Blair & Company's MRTN Position: Q1 2026 in Review

William Blair & Company held its Marten Transport (MRTN) position steady in Q1 2026 at 22,800 shares worth $299K. The position accounts for ﹤0.01% of the portfolio, ranked #1337.

William Blair & Company first reported a position in MRTN in Q3 2021 and has held it in 19 quarters since. The position peaked at $490K in Q2 2023. 225 funds tracked by Wall St. Rank hold MRTN as of Q1 2026.

  • William Blair & Company held 22,800 shares of Marten Transport worth $299K as of Q1 2026.
  • William Blair & Company left its Marten Transport share count unchanged in Q1 2026.
  • Marten Transport made up ﹤0.01% of William Blair & Company's portfolio in Q1 2026, its #1337 holding.
  • William Blair & Company first reported a position in Marten Transport in Q3 2021 and has held it in 19 quarters since.
  • William Blair & Company's Marten Transport position peaked at $490K in Q2 2023.
  • 225 funds tracked by Wall St. Rank held Marten Transport as of Q1 2026.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.