William Blair & Company
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William Blair & Company’s Waters Corp WAT Stock Holding History

William Blair & Company’s Portfolio WAT Stock Details WAT Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$3.04M Buy
10,204
+4,379
+75% +$1.5M 0.01% 622
2025
Q4 		$2.21M Sell
5,825
-178
-3% -$65.5K 0.01% 718
2025
Q3 		$1.8M Buy
6,003
+2,246
+60% +$678K ﹤0.01% 757
2025
Q2 		$1.31M Sell
3,757
-377
-9% -$130K ﹤0.01% 819
2025
Q1 		$1.52M Sell
4,134
-147
-3% -$56.9K ﹤0.01% 775
2024
Q4 		$1.59M Buy
4,281
+226
+6% +$82.7K ﹤0.01% 767
2024
Q3 		$1.46M Sell
4,055
-49
-1% -$16K ﹤0.01% 798
2024
Q2 		$1.19M Buy
4,104
+355
+9% +$113K ﹤0.01% 824
2024
Q1 		$1.29M Sell
3,749
-5
-0.1% -$1.64K ﹤0.01% 795
2023
Q4 		$1.24M Buy
3,754
+254
+7% +$70.2K ﹤0.01% 798
2023
Q3 		$960K Sell
3,500
-105
-3% -$29K ﹤0.01% 851
2023
Q2 		$961K Sell
3,605
-343
-9% -$95.5K ﹤0.01% 854
2023
Q1 		$1.22M Sell
3,948
-565
-13% -$183K ﹤0.01% 781
2022
Q4 		$1.55M Buy
4,513
+807
+22% +$255K 0.01% 705
2022
Q3 		$999K Sell
3,706
-28
-0.7% -$8.94K ﹤0.01% 814
2022
Q2 		$1.24M Buy
3,734
+300
+9% +$95.2K 0.01% 773
2022
Q1 		$1.07M Buy
3,434
+20
+0.6% +$6.51K ﹤0.01% 902
2021
Q4 		$1.27M Hold
3,414
– – ﹤0.01% 877
2021
Q3 		$1.22M Sell
3,414
-26
-0.8% -$10.2K ﹤0.01% 855
2021
Q2 		$1.19M Sell
3,440
-580
-14% -$184K ﹤0.01% 868
2021
Q1 		$1.14M Sell
4,020
-12
-0.3% -$3.28K ﹤0.01% 853
2020
Q4 		$998K Sell
4,032
-215
-5% -$48.7K ﹤0.01% 851
2020
Q3 		$831K Sell
4,247
-32
-0.7% -$6.65K ﹤0.01% 811
2020
Q2 		$772K Sell
4,279
-62
-1% -$11.7K ﹤0.01% 804
2020
Q1 		$790K Sell
4,341
-172
-4% -$36.3K ﹤0.01% 730
2019
Q4 		$1.05M Buy
4,513
+513
+13% +$113K 0.01% 768
2019
Q3 		$893K Sell
4,000
-287
-7% -$61.9K 0.01% 784
2019
Q2 		$923K Sell
4,287
-228
-5% -$49.8K 0.01% 779
2019
Q1 		$1.14M Sell
4,515
-1,528
-25% -$348K 0.01% 700
2018
Q4 		$1.14M Buy
6,043
+177
+3% +$33.6K 0.01% 657
2018
Q3 		$1.14M Buy
5,866
+65
+1% +$12.6K 0.01% 702
2018
Q2 		$1.12M Sell
5,801
-10
-0.2% -$1.97K 0.01% 684
2018
Q1 		$1.15M Buy
5,811
+40
+0.7% +$8.27K 0.01% 672
2017
Q4 		$1.11M Sell
5,771
-210
-4% -$40.5K 0.01% 718
2017
Q3 		$1.07M Buy
5,981
+50
+0.8% +$9.07K 0.01% 708
2017
Q2 		$1.09M Buy
5,931
+1,587
+37% +$276K 0.01% 725
2017
Q1 		$675K Hold
4,344
– – 0.01% 809
2016
Q4 		$584K Buy
4,344
+65
+2% +$9.28K 0.01% 784
2016
Q3 		$678K Sell
4,279
-403
-9% -$62.4K 0.01% 742
2016
Q2 		$659K Sell
4,682
-324
-6% -$43.8K 0.01% 724
2016
Q1 		$659K Sell
5,006
-6,175
-55% -$770K 0.01% 714
2015
Q4 		$1.5M Buy
11,181
+250
+2% +$32.1K 0.01% 530
2015
Q3 		$1.29M Buy
10,931
+5,285
+94% +$668K 0.01% 668
2015
Q2 		$724K Sell
5,646
-720
-11% -$93.4K ﹤0.01% 1656
2015
Q1 		$791K Sell
6,366
-340
-5% -$40.6K ﹤0.01% 1607
2014
Q4 		$755K Buy
6,706
+210
+3% +$23K ﹤0.01% 1581
2014
Q3 		$643K Buy
6,496
+2,594
+66% +$267K ﹤0.01% 1618
2014
Q2 		$407K Buy
3,902
+292
+8% +$30.7K ﹤0.01% 1722
2014
Q1 		$391K Buy
3,610
+210
+6% +$22.8K ﹤0.01% 1690
2013
Q4 		$340K Buy
3,400
+35
+1% +$3.53K ﹤0.01% 1704
2013
Q3 		$357K Sell
3,365
-1,745
-34% -$179K ﹤0.01% 1664
2013
Q2 		$511K Buy
+5,110
New +$489K ﹤0.01% 1500

Other funds holding WAT

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $298B AUM 21.96% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Fundsmith LLP
Fundsmith LLP London, United Kingdom $12.8B AUM 6.9% 1-Year Est. Return
AllianceBernstein
AllianceBernstein Nashville, Tennessee $309B AUM 23.92% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return

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

William Blair & Company increased its Waters Corp (WAT) stake by 75% in Q1 2026, buying an estimated $1.5M and bringing the position to 10,204 shares worth $3.04M. The position accounts for 0.01% of the portfolio, ranked #622.

William Blair & Company first reported a position in WAT in Q2 2013 and has held it in 52 quarters since. 1,171 funds tracked by Wall St. Rank hold WAT as of Q1 2026.

  • William Blair & Company held 10,204 shares of Waters Corp worth $3.04M as of Q1 2026.
  • William Blair & Company bought 4,379 Waters Corp shares in Q1 2026, an estimated $1.5M.
  • Waters Corp made up 0.01% of William Blair & Company's portfolio in Q1 2026, its #622 holding.
  • William Blair & Company first reported a position in Waters Corp in Q2 2013 and has held it in 52 quarters since.
  • 1,171 funds tracked by Wall St. Rank held Waters Corp as of Q1 2026.

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