William Blair & Company
AMT icon

William Blair & Company’s American Tower AMT Stock Holding History

William Blair & Company’s Portfolio AMT Stock Details AMT Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2017
Q3 		– Sell
-3,300
Closed -$437K – 1367
2017
Q2 		$437K Hold
3,300
– – ﹤0.01% 1020
2017
Q1 		$401K Hold
3,300
– – ﹤0.01% 973
2016
Q4 		$348K Buy
3,300
+300
+10% +$32.6K ﹤0.01% 943
2016
Q3 		$340K Buy
+3,000
New +$343K ﹤0.01% 975

Other funds holding AMT

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Cohen & Steers
Cohen & Steers New York $63.2B AUM 17.15% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
Lazard Asset Management
Lazard Asset Management New York $66.1B AUM 33.53% 1-Year Est. Return

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

William Blair & Company reduced its American Tower (AMT) stake by 10% in Q2 2026, selling an estimated $8.79M and leaving 421,304 shares worth $68.9M. The position accounts for 0.18% of the portfolio, ranked #117.

William Blair & Company first reported a position in AMT in Q2 2013 and has held it in 53 quarters since. The position peaked at $217M in Q4 2021. 1,754 funds tracked by Wall St. Rank hold AMT as of Q2 2026.

  • William Blair & Company held 421,304 shares of American Tower worth $68.9M as of Q2 2026.
  • William Blair & Company sold 48,824 American Tower shares in Q2 2026, an estimated $8.79M.
  • American Tower made up 0.18% of William Blair & Company's portfolio in Q2 2026, its #117 holding.
  • William Blair & Company first reported a position in American Tower in Q2 2013 and has held it in 53 quarters since.
  • William Blair & Company's American Tower position peaked at $217M in Q4 2021.
  • 1,754 funds tracked by Wall St. Rank held American Tower as of Q2 2026.

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