William Blair & Company
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William Blair & Company’s ATI ATI Stock Holding History

William Blair & Company’s Portfolio ATI Stock Details ATI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$45.7M Sell
231,946
-5,050
-2% -$856K 0.12% 152
2026
Q1 		$34.5M Buy
236,996
+192,894
+437% +$26.9M 0.1% 178
2025
Q4 		$5.06M Buy
44,102
+40,415
+1,096% +$3.94M 0.01% 512
2025
Q3 		$300K Buy
3,687
+100
+3% +$8.1K ﹤0.01% 1304
2025
Q2 		$310K Buy
+3,587
New +$246K ﹤0.01% 1249
2024
Q4 		– Sell
-3,587
Closed -$240K – 1821
2024
Q3 		$240K Buy
+3,587
New +$223K ﹤0.01% 1377

Other funds holding ATI

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
Capital World Investors
Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $717B AUM 35.42% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Capital International Investors
Capital International Investors Los Angeles, California $484B AUM 34.9% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

William Blair & Company's ATI Position: Q2 2026 in Review

William Blair & Company reduced its ATI (ATI) stake by 2.1% in Q2 2026, selling an estimated $856K and leaving 231,946 shares worth $45.7M. The position accounts for 0.12% of the portfolio, ranked #152.

William Blair & Company first reported a position in ATI in Q3 2024 and has held it in 6 quarters since. 793 funds tracked by Wall St. Rank hold ATI as of Q2 2026.

  • William Blair & Company held 231,946 shares of ATI worth $45.7M as of Q2 2026.
  • William Blair & Company sold 5,050 ATI shares in Q2 2026, an estimated $856K.
  • ATI made up 0.12% of William Blair & Company's portfolio in Q2 2026, its #152 holding.
  • William Blair & Company first reported a position in ATI in Q3 2024 and has held it in 6 quarters since.
  • 793 funds tracked by Wall St. Rank held ATI as of Q2 2026.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.