William Blair & Company
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William Blair & Company’s Moderna MRNA Stock Holding History

William Blair & Company’s Portfolio MRNA Stock Details MRNA Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$373K Buy
7,338
+392
+6% +$18.3K ﹤0.01% 1247
2025
Q4 		$205K Sell
6,946
-888
-11% -$24.1K ﹤0.01% 1454
2025
Q3 		$202K Sell
7,834
-663
-8% -$18.5K ﹤0.01% 1460
2025
Q2 		$234K Sell
8,497
-1,703
-17% -$44.8K ﹤0.01% 1358
2025
Q1 		$289K Sell
10,200
-15,740
-61% -$559K ﹤0.01% 1271
2024
Q4 		$1.08M Sell
25,940
-390
-1% -$18.6K ﹤0.01% 881
2024
Q3 		$1.76M Sell
26,330
-170
-0.6% -$15.6K 0.01% 745
2024
Q2 		$3.15M Sell
26,500
-4,815
-15% -$609K 0.01% 582
2024
Q1 		$3.34M Sell
31,315
-3,601
-10% -$363K 0.01% 565
2023
Q4 		$3.47M Sell
34,916
-6,369
-15% -$536K 0.01% 542
2023
Q3 		$4.26M Sell
41,285
-4,657
-10% -$519K 0.02% 471
2023
Q2 		$5.58M Buy
45,942
+29,043
+172% +$3.87M 0.02% 418
2023
Q1 		$2.6M Buy
16,899
+1,306
+8% +$215K 0.01% 596
2022
Q4 		$2.8M Buy
15,593
+822
+6% +$134K 0.01% 555
2022
Q3 		$1.75M Buy
14,771
+20
+0.1% +$3.04K 0.01% 646
2022
Q2 		$2.11M Sell
14,751
-860
-6% -$123K 0.01% 624
2022
Q1 		$2.69M Buy
15,611
+1,724
+12% +$290K 0.01% 620
2021
Q4 		$3.53M Buy
13,887
+590
+4% +$173K 0.01% 573
2021
Q3 		$5.12M Buy
13,297
+448
+3% +$165K 0.02% 452
2021
Q2 		$3.02M Sell
12,849
-5,973
-32% -$1.07M 0.01% 589
2021
Q1 		$2.46M Buy
18,822
+3,529
+23% +$511K 0.01% 620
2020
Q4 		$1.6M Sell
15,293
-1,790
-10% -$181K 0.01% 711
2020
Q3 		$1.21M Buy
17,083
+1,022
+6% +$71.3K 0.01% 706
2020
Q2 		$1.03M Buy
+16,061
New +$880K ﹤0.01% 713

Other funds holding MRNA

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Baillie Gifford & Co
Baillie Gifford & Co Edinburgh, United Kingdom $97.9B AUM 20.73% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 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
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

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

William Blair & Company increased its Moderna (MRNA) stake by 5.6% in Q1 2026, buying an estimated $18.3K and bringing the position to 7,338 shares worth $373K. The position accounts for ﹤0.01% of the portfolio, ranked #1247.

William Blair & Company first reported a position in MRNA in Q2 2020 and has held it in 24 quarters since. The position peaked at $5.58M in Q2 2023. 723 funds tracked by Wall St. Rank hold MRNA as of Q1 2026.

  • William Blair & Company held 7,338 shares of Moderna worth $373K as of Q1 2026.
  • William Blair & Company bought 392 Moderna shares in Q1 2026, an estimated $18.3K.
  • Moderna made up ﹤0.01% of William Blair & Company's portfolio in Q1 2026, its #1247 holding.
  • William Blair & Company first reported a position in Moderna in Q2 2020 and has held it in 24 quarters since.
  • William Blair & Company's Moderna position peaked at $5.58M in Q2 2023.
  • 723 funds tracked by Wall St. Rank held Moderna as of Q1 2026.

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