ECP ControlCo, LLC
ECP ControlCo, LLC declares $4.5B in 2 of the 220 AI and semiconductor companies tracked on Silicon Floor, as of Jun 30, 2026 (Form 13F): 96.2% of its $4.7B 13F portfolio. Largest positions: Constellation Energy (4.1% of the company) and Talen Energy (5.0% of the company). Over time: $4.5B in 2 of these companies for Q2 2026, against $42.6M in 1 for Q1 2020 (13F values as filed). From Mar 31, 2026 to Jun 30, 2026, it bought $922.2M and sold $1.9B of these stocks, at the quarter's prices: a net sale of $983.6M; 1 new position.
Performance of its AI picks
The AI-stock portfolio ECP ControlCo, LLC declared for Q2 2026 (Form 13F), held unchanged, returned -1.9% in Q3 2026 (SMH -7.1%). Trades made during a quarter are not visible in 13F filings: this measures its declared picks, not the return of its funds.
Largest positions
- Constellation Energy (CEG) — $3.6B: 14.4M shares, 4.1% of the company, 76.4% of its portfolio (trimmed this quarter); held since Q1 2026
- Talen Energy (TLN) — $922.2M: 2.4M shares, 5.0% of the company, 19.8% of its portfolio (new position this quarter)
By sector
- Power, electrical & cooling — $4.5B, 100% of its AI holdings, 2 companies
Biggest changes this quarter
- trimmed Constellation Energy (CEG): -$1.9B at the quarter's price
- opened a position in Talen Energy (TLN): +$922.2M at the quarter's price
Schedule 13D/G declarations
- Constellation Energy (CEG) — 13G filed Aug 7, 2026: 14.4M shares as of Jun 30, 2026, 4.0% as declared
- Talen Energy (TLN) — 13G filed Jun 23, 2026: 2.4M shares as of Jun 15, 2026, 5.0% as declared
- Constellation Energy (CEG) — 13G filed Jan 14, 2026: 22.0M shares as of Jan 7, 2026, 6.1% as declared