William Blair Investment Management
TLN

William Blair Investment Management’s Talen Energy Corp TLN Stock Holding History

William Blair Investment Management’s Portfolio TLN Stock Details TLN Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$191M Sell
497,660
-27,554
-5% -$10.1M 0.58% 40
2026
Q1 		$168M Sell
525,214
-44,185
-8% -$15.6M 0.55% 43
2025
Q4 		$213M Sell
569,399
-110,298
-16% -$42.9M 0.6% 35
2025
Q3 		$289M Sell
679,697
-422,085
-38% -$152M 0.75% 24
2025
Q2 		$320M Sell
1,101,782
-11,211
-1% -$2.66M 0.85% 18
2025
Q1 		$222M Sell
1,112,993
-78,173
-7% -$17M 0.62% 39
2024
Q4 		$240M Buy
+1,191,166
New +$232M 0.59% 38

Other funds holding TLN

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
RCMNY
Rubric Capital Management (New York) New York $10.9B AUM 70.31% 1-Year Est. Return
MP
MFN Partners Boston, Massachusetts $4.83B AUM 65.74% 1-Year Est. Return
EC
ECP ControlCo Summit, New Jersey $4.67B AUM 13.65% 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
FAM
Fred Alger Management New York $30B AUM 76.99% 1-Year Est. Return
WHRC
W.H. Reaves & Co Jersey City, New Jersey $6.59B AUM 31.9% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
SHCM
Sachem Head Capital Management New York $4.82B AUM 73.38% 1-Year Est. Return

William Blair Investment Management's TLN Position: Q2 2026 in Review

William Blair Investment Management reduced its Talen Energy Corp (TLN) stake by 5.2% in Q2 2026, selling an estimated $10.1M and leaving 497,660 shares worth $191M. The position accounts for 0.58% of the portfolio, ranked #40.

William Blair Investment Management first reported a position in TLN in Q4 2024 and has held it in 7 quarters since. The position peaked at $320M in Q2 2025. 642 funds tracked by Wall St. Rank hold TLN as of Q2 2026.

  • William Blair Investment Management held 497,660 shares of Talen Energy Corp worth $191M as of Q2 2026.
  • William Blair Investment Management sold 27,554 Talen Energy Corp shares in Q2 2026, an estimated $10.1M.
  • Talen Energy Corp made up 0.58% of William Blair Investment Management's portfolio in Q2 2026, its #40 holding.
  • William Blair Investment Management first reported a position in Talen Energy Corp in Q4 2024 and has held it in 7 quarters since.
  • William Blair Investment Management's Talen Energy Corp position peaked at $320M in Q2 2025.
  • 642 funds tracked by Wall St. Rank held Talen Energy Corp as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.