William Blair & Company
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William Blair & Company’s TransDigm Group TDG Stock Holding History

William Blair & Company’s Portfolio TDG Stock Details TDG Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2017
Q3 		– Sell
-300
Closed -$81K – 1500
2017
Q2 		$81K Hold
300
– – ﹤0.01% 1436
2017
Q1 		$66K Hold
300
– – ﹤0.01% 1317
2016
Q4 		$74K Buy
+300
New +$78.8K ﹤0.01% 1238

Other funds holding TDG

Capital International Investors
Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $733B AUM 35.63% 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
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $645B AUM 30.41% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Principal Financial Group
Principal Financial Group Des Moines, Iowa $187B AUM 18.48% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

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

William Blair & Company reduced its TransDigm Group (TDG) stake by 2.3% in Q1 2026, selling an estimated $5.22M and leaving 166,248 shares worth $193M. The position accounts for 0.55% of the portfolio, ranked #41.

William Blair & Company first reported a position in TDG in Q2 2013 and has held it in 52 quarters since. The position peaked at $305M in Q1 2014. 1,108 funds tracked by Wall St. Rank hold TDG as of Q1 2026.

  • William Blair & Company held 166,248 shares of TransDigm Group worth $193M as of Q1 2026.
  • William Blair & Company sold 3,982 TransDigm Group shares in Q1 2026, an estimated $5.22M.
  • TransDigm Group made up 0.55% of William Blair & Company's portfolio in Q1 2026, its #41 holding.
  • William Blair & Company first reported a position in TransDigm Group in Q2 2013 and has held it in 52 quarters since.
  • William Blair & Company's TransDigm Group position peaked at $305M in Q1 2014.
  • 1,108 funds tracked by Wall St. Rank held TransDigm Group as of Q1 2026.

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