William Blair & Company
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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 $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
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Cohen & Steers
Cohen & Steers New York $57.6B AUM 8.03% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Deutsche Bank
Deutsche Bank Frankfurt Am Main Ge, Germany $303B AUM 30.15% 1-Year Est. Return

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

William Blair & Company reduced its American Tower (AMT) stake by 31% in Q1 2026, selling an estimated $37.4M and leaving 470,128 shares worth $81.1M. The position accounts for 0.23% of the portfolio, ranked #102.

William Blair & Company first reported a position in AMT in Q2 2013 and has held it in 52 quarters since. The position peaked at $217M in Q4 2021. 1,750 funds tracked by Wall St. Rank hold AMT as of Q1 2026.

  • William Blair & Company held 470,128 shares of American Tower worth $81.1M as of Q1 2026.
  • William Blair & Company sold 208,116 American Tower shares in Q1 2026, an estimated $37.4M.
  • American Tower made up 0.23% of William Blair & Company's portfolio in Q1 2026, its #102 holding.
  • William Blair & Company first reported a position in American Tower in Q2 2013 and has held it in 52 quarters since.
  • William Blair & Company's American Tower position peaked at $217M in Q4 2021.
  • 1,750 funds tracked by Wall St. Rank held American Tower as of Q1 2026.

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