William Blair Investment Management
MRTN icon

William Blair Investment Management’s Marten Transport MRTN Stock Holding History

William Blair Investment Management’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
2025
Q3 		– Sell
-1,320,316
Closed -$17.2M – 436
2025
Q2 		$17.2M Sell
1,320,316
-110,583
-8% -$1.46M 0.05% 296
2025
Q1 		$19.6M Sell
1,430,899
-61,243
-4% -$911K 0.06% 296
2024
Q4 		$23.3M Buy
1,492,142
+31,303
+2% +$522K 0.06% 296
2024
Q3 		$25.9M Sell
1,460,839
-45,068
-3% -$791K 0.06% 270
2024
Q2 		$27.8M Sell
1,505,907
-3,087
-0.2% -$54.1K 0.07% 240
2024
Q1 		$27.9M Sell
1,508,994
-1,381
-0.1% -$26.6K 0.07% 257
2023
Q4 		$31.7M Sell
1,510,375
-30,103
-2% -$575K 0.09% 217
2023
Q3 		$30.4M Sell
1,540,478
-120,930
-7% -$2.56M 0.1% 214
2023
Q2 		$35.7M Buy
1,661,408
+30,918
+2% +$650K 0.11% 187
2023
Q1 		$34.2M Buy
1,630,490
+5,844
+0.4% +$124K 0.12% 187
2022
Q4 		$32.1M Sell
1,624,646
-61,163
-4% -$1.22M 0.12% 182
2022
Q3 		$32.3M Sell
1,685,809
-48,536
-3% -$971K 0.13% 167
2022
Q2 		$29.2M Sell
1,734,345
-50,240
-3% -$864K 0.11% 211
2022
Q1 		$31.7M Sell
1,784,585
-25,279
-1% -$443K 0.09% 237
2021
Q4 		$31.1M Sell
1,809,864
-150,441
-8% -$2.49M 0.08% 251
2021
Q3 		$30.8M Buy
1,960,305
+1,956,355
+49,528% +$30.7M 0.09% 261
2021
Q2 		$65K Buy
+3,950
New +$67.4K ﹤0.01% 442

Other funds holding MRTN

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
NI
Nuance Investments Kansas City, Missouri $588M AUM 6.93% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
GCM
Geneva Capital Management Milwaukee, Wisconsin $4.36B AUM 17.81% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Charles Schwab
Charles Schwab San Francisco, California $751B AUM 38.74% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

William Blair Investment Management's MRTN Position: Q3 2025 in Review

William Blair Investment Management sold out of Marten Transport (MRTN) in Q3 2025, closing a stake of 1,320,316 shares — an estimated $17.2M sold.

William Blair Investment Management first reported a position in MRTN in Q2 2021 and held it in 17 quarters. The position peaked at $35.7M in Q2 2023. 216 funds tracked by Wall St. Rank hold MRTN as of Q3 2025.

  • William Blair Investment Management reported no remaining Marten Transport position as of Q3 2025 after selling out during the quarter.
  • William Blair Investment Management sold 1,320,316 Marten Transport shares in Q3 2025, an estimated $17.2M.
  • William Blair Investment Management first reported a position in Marten Transport in Q2 2021 and held it in 17 quarters.
  • William Blair Investment Management's Marten Transport position peaked at $35.7M in Q2 2023.
  • 216 funds tracked by Wall St. Rank held Marten Transport as of Q3 2025.

Based on William Blair Investment Management's 13F filing for Q3 2025, filed 12 Nov 2025.