William Blair & Company
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William Blair & Company’s The Mosaic Company MOS Stock Holding History

William Blair & Company’s Portfolio MOS Stock Details MOS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$805K Buy
31,559
+592
+2% +$16.2K ﹤0.01% 1006
2025
Q4 		$746K Sell
30,967
-3,195
-9% -$86K ﹤0.01% 1016
2025
Q3 		$1.18M Sell
34,162
-4,293
-11% -$148K ﹤0.01% 876
2025
Q2 		$1.4M Buy
38,455
+1,446
+4% +$46.3K ﹤0.01% 801
2025
Q1 		$1,000K Buy
37,009
+2,047
+6% +$54.1K ﹤0.01% 883
2024
Q4 		$859K Buy
34,962
+4,574
+15% +$120K ﹤0.01% 944
2024
Q3 		$814K Sell
30,388
-533
-2% -$14.7K ﹤0.01% 962
2024
Q2 		$894K Buy
30,921
+544
+2% +$16.4K ﹤0.01% 918
2024
Q1 		$986K Sell
30,377
-522
-2% -$16.6K ﹤0.01% 873
2023
Q4 		$1.1M Buy
30,899
+2,396
+8% +$84.6K ﹤0.01% 823
2023
Q3 		$1.01M Buy
28,503
+2,844
+11% +$109K ﹤0.01% 829
2023
Q2 		$898K Sell
25,659
-2,495
-9% -$96.4K ﹤0.01% 870
2023
Q1 		$1.29M Buy
28,154
+376
+1% +$18.2K 0.01% 770
2022
Q4 		$1.22M Sell
27,778
-50
-0.2% -$2.48K 0.01% 769
2022
Q3 		$1.34M Sell
27,828
-1,784
-6% -$92.2K 0.01% 724
2022
Q2 		$1.4M Sell
29,612
-13,534
-31% -$829K 0.01% 737
2022
Q1 		$2.87M Sell
43,146
-804
-2% -$40.2K 0.01% 605
2021
Q4 		$1.73M Sell
43,950
-4,581
-9% -$175K 0.01% 769
2021
Q3 		$1.73M Buy
48,531
+10,492
+28% +$336K 0.01% 743
2021
Q2 		$1.21M Buy
38,039
+1,600
+4% +$54.3K ﹤0.01% 857
2021
Q1 		$1.15M Buy
36,439
+7,675
+27% +$226K ﹤0.01% 851
2020
Q4 		$662K Buy
28,764
+5,415
+23% +$109K ﹤0.01% 997
2020
Q3 		$427K Buy
23,349
+3,865
+20% +$62.9K ﹤0.01% 1020
2020
Q2 		$244K Sell
19,484
-332
-2% -$3.98K ﹤0.01% 1168
2020
Q1 		$214K Buy
19,816
+2,188
+12% +$37.1K ﹤0.01% 1141
2019
Q4 		$381K Sell
17,628
-1,120
-6% -$22.2K ﹤0.01% 1089
2019
Q3 		$384K Sell
18,748
-773
-4% -$16.8K ﹤0.01% 1031
2019
Q2 		$489K Buy
19,521
+9,000
+86% +$220K ﹤0.01% 984
2019
Q1 		$287K Sell
10,521
-2,469
-19% -$75.3K ﹤0.01% 1160
2018
Q4 		$379K Buy
12,990
+3,589
+38% +$118K ﹤0.01% 1000
2018
Q3 		$305K Sell
9,401
-15
-0.2% -$452 ﹤0.01% 1134
2018
Q2 		$264K Buy
9,416
+15
+0.2% +$407 ﹤0.01% 1173
2018
Q1 		$228K Sell
9,401
-306
-3% -$8.05K ﹤0.01% 1168
2017
Q4 		$249K Buy
+9,707
New +$223K ﹤0.01% 1193
2017
Q2 		– Sell
-9,104
Closed -$284K – 1651
2017
Q1 		$284K Buy
9,104
+1,965
+28% +$60.7K ﹤0.01% 1094
2016
Q4 		$209K Buy
+7,139
New +$192K ﹤0.01% 1144
2015
Q3 		– Sell
-5,137
Closed -$240K – 1492
2015
Q2 		$240K Sell
5,137
-345
-6% -$15.7K ﹤0.01% 2007
2015
Q1 		$252K Buy
5,482
+750
+16% +$36.6K ﹤0.01% 1936
2014
Q4 		$216K Sell
4,732
-1,525
-24% -$67.6K ﹤0.01% 1948
2014
Q3 		$277K Sell
6,257
-2,000
-24% -$94K ﹤0.01% 1875
2014
Q2 		$408K Buy
8,257
+544
+7% +$26.8K ﹤0.01% 1721
2014
Q1 		$385K Buy
7,713
+1,325
+21% +$63.1K ﹤0.01% 1695
2013
Q4 		$301K Buy
6,388
+606
+10% +$28.1K ﹤0.01% 1742
2013
Q3 		$248K Sell
5,782
-6,026
-51% -$281K ﹤0.01% 1805
2013
Q2 		$635K Buy
+11,808
New +$703K ﹤0.01% 1426

Other funds holding MOS

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
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $218B AUM 29.41% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

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

William Blair & Company increased its The Mosaic Company (MOS) stake by 1.9% in Q1 2026, buying an estimated $16.2K and bringing the position to 31,559 shares worth $805K. The position accounts for ﹤0.01% of the portfolio, ranked #1006.

William Blair & Company first reported a position in MOS in Q2 2013 and has held it in 45 quarters since. The position peaked at $2.87M in Q1 2022. 692 funds tracked by Wall St. Rank hold MOS as of Q1 2026.

  • William Blair & Company held 31,559 shares of The Mosaic Company worth $805K as of Q1 2026.
  • William Blair & Company bought 592 The Mosaic Company shares in Q1 2026, an estimated $16.2K.
  • The Mosaic Company made up ﹤0.01% of William Blair & Company's portfolio in Q1 2026, its #1006 holding.
  • William Blair & Company first reported a position in The Mosaic Company in Q2 2013 and has held it in 45 quarters since.
  • William Blair & Company's The Mosaic Company position peaked at $2.87M in Q1 2022.
  • 692 funds tracked by Wall St. Rank held The Mosaic Company as of Q1 2026.

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