William Blair Investment Management
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William Blair Investment Management’s Martin Marietta Materials MLM Stock Holding History

William Blair Investment Management’s Portfolio MLM Stock Details MLM Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$160M Buy
272,392
+2,189
+0.8% +$1.4M 0.53% 47
2025
Q4 		$168M Sell
270,203
-7,153
-3% -$4.45M 0.47% 52
2025
Q3 		$175M Sell
277,356
-9,359
-3% -$5.58M 0.45% 56
2025
Q2 		$157M Sell
286,715
-6,037
-2% -$3.19M 0.42% 71
2025
Q1 		$140M Sell
292,752
-145,450
-33% -$73.9M 0.39% 72
2024
Q4 		$226M Buy
438,202
+22,727
+5% +$12.9M 0.55% 47
2024
Q3 		$224M Buy
415,475
+40,664
+11% +$22M 0.55% 50
2024
Q2 		$203M Buy
374,811
+3,598
+1% +$2.09M 0.53% 51
2024
Q1 		$228M Buy
371,213
+38,824
+12% +$21.2M 0.59% 46
2023
Q4 		$166M Buy
332,389
+130,557
+65% +$58.8M 0.48% 67
2023
Q3 		$82.8M Sell
201,832
-318,234
-61% -$141M 0.28% 107
2023
Q2 		$240M Buy
520,066
+99,248
+24% +$39.1M 0.77% 26
2023
Q1 		$149M Sell
420,818
-81,631
-16% -$28.6M 0.52% 61
2022
Q4 		$170M Sell
502,449
-30,041
-6% -$10.2M 0.65% 49
2022
Q3 		$172M Buy
532,490
+224,089
+73% +$75.9M 0.68% 47
2022
Q2 		$92.3M Sell
308,401
-6,978
-2% -$2.38M 0.34% 99
2022
Q1 		$121M Sell
315,379
-360,234
-53% -$140M 0.36% 94
2021
Q4 		$298M Sell
675,613
-173,199
-20% -$70.2M 0.8% 28
2021
Q3 		$290M Sell
848,812
-119,200
-12% -$43.4M 0.82% 29
2021
Q2 		$341M Sell
968,012
-14,320
-1% -$5.1M 1.07% 18
2021
Q1 		$330M Sell
982,332
-178,828
-15% -$57.1M 1.07% 15
2020
Q4 		$330M Sell
1,161,160
-15,255
-1% -$4.06M 1.1% 16
2020
Q3 		$277M Sell
1,176,415
-17,394
-1% -$3.76M 1.08% 16
2020
Q2 		$247M Buy
1,193,809
+54,050
+5% +$10.4M 1% 19
2020
Q1 		$216M Buy
1,139,759
+101,312
+10% +$24.2M 1.05% 18
2019
Q4 		$290M Buy
1,038,447
+22,837
+2% +$6.09M 1.16% 15
2019
Q3 		$278M Buy
1,015,610
+20,555
+2% +$5.08M 1.19% 12
2019
Q2 		$229M Sell
995,055
-10,003
-1% -$2.17M 0.96% 20
2019
Q1 		$202M Sell
1,005,058
-5,987
-0.6% -$1.12M 0.85% 32
2018
Q4 		$174M Sell
1,011,045
-10,684
-1% -$1.9M 0.86% 27
2018
Q3 		$186M Buy
1,021,729
+56,601
+6% +$11.7M 0.64% 49
2018
Q2 		$216M Buy
965,128
+166,999
+21% +$35.6M 0.8% 23
2018
Q1 		$165M Buy
798,129
+44,985
+6% +$9.75M 0.63% 45
2017
Q4 		$166M Buy
753,144
+157,388
+26% +$33M 0.65% 39
2017
Q3 		$123M Buy
595,756
+130,473
+28% +$27.6M 0.44% 73
2017
Q2 		$104M Buy
465,283
+85,835
+23% +$19.4M 0.38% 87
2017
Q1 		$82.8M Buy
379,448
+33,768
+10% +$7.45M 0.31% 103
2016
Q4 		$76.6M Buy
345,680
+68,273
+25% +$14M 0.31% 114
2016
Q3 		$49.7M Buy
277,407
+2,315
+0.8% +$442K 0.19% 148
2016
Q2 		$52.8M Buy
275,092
+131,283
+91% +$23.5M 0.21% 134
2016
Q1 		$22.9M Buy
+143,809
New +$19.8M 0.09% 189

Other funds holding MLM

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return
Principal Financial Group
Principal Financial Group Des Moines, Iowa $187B AUM 18.48% 1-Year Est. Return
Aristotle Capital Management
Aristotle Capital Management Los Angeles, California $47.8B AUM 13.38% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
Victory Capital Management
Victory Capital Management San Antonio, Texas $156B AUM 27.51% 1-Year Est. Return

William Blair Investment Management's MLM Position: Q1 2026 in Review

William Blair Investment Management increased its Martin Marietta Materials (MLM) stake by 0.81% in Q1 2026, buying an estimated $1.4M and bringing the position to 272,392 shares worth $160M. The position accounts for 0.53% of the portfolio, ranked #47.

William Blair Investment Management first reported a position in MLM in Q1 2016 and has held it in 41 quarters since. The position peaked at $341M in Q2 2021. 1,069 funds tracked by Wall St. Rank hold MLM as of Q1 2026.

  • William Blair Investment Management held 272,392 shares of Martin Marietta Materials worth $160M as of Q1 2026.
  • William Blair Investment Management bought 2,189 Martin Marietta Materials shares in Q1 2026, an estimated $1.4M.
  • Martin Marietta Materials made up 0.53% of William Blair Investment Management's portfolio in Q1 2026, its #47 holding.
  • William Blair Investment Management first reported a position in Martin Marietta Materials in Q1 2016 and has held it in 41 quarters since.
  • William Blair Investment Management's Martin Marietta Materials position peaked at $341M in Q2 2021.
  • 1,069 funds tracked by Wall St. Rank held Martin Marietta Materials as of Q1 2026.

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