William Blair Investment Management
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William Blair Investment Management’s Merit Medical Systems MMSI Stock Holding History

William Blair Investment Management’s Portfolio MMSI Stock Details MMSI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$78.9M Buy
1,137,790
+360,296
+46% +$23.8M 0.24% 122
2026
Q1 		$53.6M Sell
777,494
-97,365
-11% -$7.61M 0.18% 129
2025
Q4 		$77.1M Buy
874,859
+10,863
+1% +$925K 0.22% 118
2025
Q3 		$71.9M Buy
863,996
+124,396
+17% +$10.8M 0.19% 126
2025
Q2 		$69.1M Buy
739,600
+137,956
+23% +$13.1M 0.18% 123
2025
Q1 		$63.6M Sell
601,644
-85,387
-12% -$8.81M 0.18% 131
2024
Q4 		$66.4M Sell
687,031
-751,501
-52% -$74.9M 0.16% 131
2024
Q3 		$142M Sell
1,438,532
-1,614,929
-53% -$148M 0.35% 97
2024
Q2 		$262M Buy
3,053,461
+10,512
+0.3% +$827K 0.69% 31
2024
Q1 		$231M Sell
3,042,949
-748,140
-20% -$57.8M 0.6% 43
2023
Q4 		$288M Sell
3,791,089
-104,606
-3% -$7.3M 0.84% 20
2023
Q3 		$269M Buy
3,895,695
+520,423
+15% +$37.5M 0.89% 18
2023
Q2 		$282M Sell
3,375,272
-20,560
-0.6% -$1.67M 0.91% 17
2023
Q1 		$251M Sell
3,395,832
-334,148
-9% -$23.4M 0.88% 23
2022
Q4 		$263M Sell
3,729,980
-354,017
-9% -$23.6M 1.01% 19
2022
Q3 		$231M Buy
4,083,997
+833,134
+26% +$48M 0.91% 21
2022
Q2 		$176M Sell
3,250,863
-100,825
-3% -$6.15M 0.65% 43
2022
Q1 		$223M Sell
3,351,688
-5,950
-0.2% -$358K 0.67% 43
2021
Q4 		$209M Sell
3,357,638
-25,024
-0.7% -$1.68M 0.57% 58
2021
Q3 		$243M Sell
3,382,662
-54,656
-2% -$3.71M 0.69% 39
2021
Q2 		$222M Sell
3,437,318
-39,611
-1% -$2.45M 0.7% 44
2021
Q1 		$208M Buy
3,476,929
+89,564
+3% +$5.13M 0.67% 51
2020
Q4 		$188M Buy
3,387,365
+2,414,401
+248% +$125M 0.63% 61
2020
Q3 		$42.3M Buy
972,964
+7,028
+0.7% +$318K 0.16% 135
2020
Q2 		$44.1M Buy
965,936
+11,063
+1% +$446K 0.18% 133
2020
Q1 		$29.8M Buy
954,873
+101,946
+12% +$3.63M 0.15% 143
2019
Q4 		$26.6M Buy
+852,927
New +$24.4M 0.11% 165

Other funds holding MMSI

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
CCA
Conestoga Capital Advisors Wayne, Pennsylvania $4.6B AUM 16.08% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management San Mateo, California $36.7B AUM 74.15% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
NAMI
Nomura Asset Management International Philadelphia, Pennsylvania $66.6B AUM
CAM
Congress Asset Management Boston, Massachusetts $16.3B AUM 42.69% 1-Year Est. Return

William Blair Investment Management's MMSI Position: Q2 2026 in Review

William Blair Investment Management increased its Merit Medical Systems (MMSI) stake by 46% in Q2 2026, buying an estimated $23.8M and bringing the position to 1,137,790 shares worth $78.9M. The position accounts for 0.24% of the portfolio, ranked #122.

William Blair Investment Management first reported a position in MMSI in Q4 2019 and has held it in 27 quarters since. The position peaked at $288M in Q4 2023. 403 funds tracked by Wall St. Rank hold MMSI as of Q2 2026.

  • William Blair Investment Management held 1,137,790 shares of Merit Medical Systems worth $78.9M as of Q2 2026.
  • William Blair Investment Management bought 360,296 Merit Medical Systems shares in Q2 2026, an estimated $23.8M.
  • Merit Medical Systems made up 0.24% of William Blair Investment Management's portfolio in Q2 2026, its #122 holding.
  • William Blair Investment Management first reported a position in Merit Medical Systems in Q4 2019 and has held it in 27 quarters since.
  • William Blair Investment Management's Merit Medical Systems position peaked at $288M in Q4 2023.
  • 403 funds tracked by Wall St. Rank held Merit Medical Systems as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.