ECP ControlCo, LLC holds a concentrated book of 5 stocks worth $4.7B as of Q2 2026 (disclosed Aug 14, 2026, a ~45-day 13F lag). This quarter they opened Talen Energy Corp and trimmed Constellation Energy. Their largest long position is Constellation Energy at 76% of the equity book.
Top-heavy: concentrated book
Excluding Constellation Energy (76% of the book), the rest is a concentrated book:
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
100% mapped to company sectors
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices (an exit at the prior quarter-end), no cost basis
Other tracked managers holding the same core names as ECP ControlCo, LLC
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| GCM Grosvenor Holdings, LLC | 2 / 5 | $308.7M |
| Rubric Capital Management LP | 2 / 5 | $1.3B |
| Reaves W H & Co Inc | 3 / 5 | $893.9M |
| Gallagher Fiduciary Advisors, LLC | 2 / 5 | $325.6M |
| Clearfield Capital Management LP | 2 / 5 | $19.6M |
| Covalis Capital LLP | 2 / 5 | $163.4M |
| Owl Creek Asset Management, L.P. | 2 / 5 | $69.4M |
| Electron Capital Partners, LLC | 2 / 5 | $123.4M |
Ranked by the share of each fund's own book sitting in the names it shares with ECP ControlCo, LLC: only funds sharing at least a tenth of the book qualify. Index giants, bank custody books and market makers are excluded. They hold everything, so their overlap says nothing.
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Constellation Energy Corp COM | $3.6B | 14.37M | 76.4% | ▼−35% Reduced · −7.7M sh | |
| 2 | Talen Energy Corp COM | $922.2M | 2.40M | 19.8% | ▲New New position | |
| 3 | PG&E Corp COM | $119.8M | 7.12M | 2.6% | —Held | |
| 4 | Shenandoah Telecommunication COM | $52.1M | 3.46M | 1.1% | —Held | |
| 5 | Clean Energy Fuels Corp COM | $5.3M | 2.59M | 0.1% | —Held |
This fund page is the Follow view. The Build view lets your agent pull holdings, quarter changes, overlap, and source filings through API or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1707921/holdings"
Use Arkolith to show ECP ControlCo, LLC's latest holdings, largest changes, and filing provenance.
As-of date vs the date the SEC received each filing
Reported 13F total per quarter, log scale (the range spans more than 20x). Raw filing totals can include option notional.
| Quarter | As of | Filed | Lag | Positions | Value | Form |
|---|---|---|---|---|---|---|
| Q2 2026 | Jun 30, 2026 | Aug 14, 2026 | 45d | 5 | $4.7B | 13F-HR |
| Q1 2026 | Mar 31, 2026 | May 15, 2026 | 45d | 4 | $6.3B | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 17, 2026 | 48d | 4 | $204.9M | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Feb 17, 2026 | 140d | 5 | $251.0M | 13F-HR/A |
| Q2 2025 | Jun 30, 2025 | Feb 17, 2026 | 232d | 5 | $215.3M | 13F-HR/A |
| Q1 2025 | Mar 31, 2025 | Feb 17, 2026 | 323d | 5 | $242.8M | 13F-HR/A |
| Q4 2024 | Dec 31, 2024 | Feb 14, 2025 | 45d | 4 | $259.6M | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Nov 14, 2024 | 45d | 6 | $328.6M | 13F-HR |
| Q2 2024 | Jun 30, 2024 | Aug 14, 2024 | 45d | 7 | $323.8M | 13F-HR |
| Q1 2024 | Mar 31, 2024 | May 15, 2024 | 45d | 7 | $362.7M | 13F-HR |
| Q4 2023 | Dec 31, 2023 | Feb 14, 2024 | 45d | 8 | $460.6M | 13F-HR |
| Q3 2023 | Sep 30, 2023 | Nov 14, 2023 | 45d | 9 | $436.2M | 13F-HR |
| Q2 2023 | Jun 30, 2023 | Aug 14, 2023 | 45d | 9 | $496.3M | 13F-HR |
| Q1 2023 | Mar 31, 2023 | Aug 14, 2023 | 136d | 8 | $499.4M | 13F-HR/A |
| Q4 2022 | Dec 31, 2022 | Apr 27, 2023 | 117d | 7 | $494.9M | 13F-HR/A |
| Q3 2022 | Sep 30, 2022 | Apr 27, 2023 | 209d | 9 | $497.1M | 13F-HR/A |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. The book and weighting are long equity only; disclosed put/call options are listed separately and excluded from those totals. Price-derived performance is withheld until the price-source policy and freshness gate are green.