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Mattern Capital Management’s Constellation Energy CEG Stock Holding History

Mattern Capital Management’s Portfolio CEG Stock Details CEG Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$8.54M Sell
34,378
-2,729
-7% -$769K 1% 59
2026
Q1 		$10.4M Buy
37,107
+13,476
+57% +$4.1M 1.24% 23
2025
Q4 		$8.35M Buy
23,631
+829
+4% +$301K 0.99% 59
2025
Q3 		$7.5M Buy
+22,802
New +$7.36M 0.88% 67

Other funds holding CEG

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
EC
ECP ControlCo Summit, New Jersey $4.67B AUM 13.65% 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
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Mattern Capital Management's CEG Position: Q2 2026 in Review

Mattern Capital Management reduced its Constellation Energy (CEG) stake by 7.4% in Q2 2026, selling an estimated $769K and leaving 34,378 shares worth $8.54M. The position accounts for 1% of the portfolio, ranked #59.

Mattern Capital Management first reported a position in CEG in Q3 2025 and has held it in 4 quarters since. The position peaked at $10.4M in Q1 2026. 1,860 funds tracked by Wall St. Rank hold CEG as of Q2 2026.

  • Mattern Capital Management held 34,378 shares of Constellation Energy worth $8.54M as of Q2 2026.
  • Mattern Capital Management sold 2,729 Constellation Energy shares in Q2 2026, an estimated $769K.
  • Constellation Energy made up 1% of Mattern Capital Management's portfolio in Q2 2026, its #59 holding.
  • Mattern Capital Management first reported a position in Constellation Energy in Q3 2025 and has held it in 4 quarters since.
  • Mattern Capital Management's Constellation Energy position peaked at $10.4M in Q1 2026.
  • 1,860 funds tracked by Wall St. Rank held Constellation Energy as of Q2 2026.

Based on Mattern Capital Management's 13F filing for Q2 2026, filed 24 Jul 2026.