Who owns ISA?
ISA is owned by Ecopetrol (Colombia, NYSE: EC).[1]
Ecopetrol owns 51.4% of ISA rather than all of it.
Evidence: Ecopetrol S.A. Annual Report on Form 20-F filed 2026-04-30, SEC EDGAR, 30 April 2026. Verified from filings; last checked .
Key facts
- Current owner
- Ecopetrol S.A. (51.4% stake) verified
- Owner HQ
- 🇨🇴 Colombia
- Origin
- 🇨🇴 Colombia
- Category
- Energy › Power & utilities › Grids & transmission
- Parent ticker
- NYSE: EC
- Last verified
- · 1 sources
About ISA
Ecopetrol's 2025 Form 20-F says it acquired 51.4 percent of ISA from the Ministry of Finance and Public Credit on 20 August 2021. ISA's Colombian transmission subsidiaries operated 14,144 kilometres of lines and 25,655 MVA of transformation capacity at the end of 2025, and ISA also runs toll-road concessions in Chile, Colombia and Panama.
What Ecopetrol's annual report says about ISA
Sentences about ISA from Ecopetrol's latest annual filing[1], copied word for word.
Currently, through ISA, leader in the energy transmission and toll roads concessions business in terms of regional market share, the Ecopetrol Group responds competitively to the challenges of decarbonization and diversification, meeting new demands in the context of the energy transition, diversifying the portfolio and participating into new segments of the energy sector.
In the energy transmission and toll roads concessions segment, the aim is to continue the growth trajectory in both new and existing geographies, leveraging ISA's strategic leadership position in the power transmission business in Latin America.
On March 13, 2025, ISA launched its 2040 Strategy, "Energy that brings life to the transition," aiming to position itself as a leading energy transmission company on the continent through investments in new electric energy businesses.
How often Ecopetrol names ISA in its annual report
A plain count of the times the name appears in the text of each annual report, not counting the start of a sentence. A brand that an owner writes about more is usually one it treats as central. The brand is named less often than it was three years earlier.
Ownership timeline of ISA
Where ISA sits in Ecopetrol
Controlling ownership as of . Brands grouped under the entity that owns them; large groups are collapsed.
Open the full Ecopetrol ownership tree →
See the full Ecopetrol brand portfolio (6) →
Other brands owned by Ecopetrol
Ecopetrol controls 6 brands on Brandtree, 6 of them in energy.
Also in energy
Other brands in grids & transmission, and who owns them
The 11 brands in grids & transmission on Brandtree belong to 9 owners. The largest is ESB, with 2.
| Brand | Owner | Owner based in |
|---|---|---|
| ESB Networks | ESB | 🇮🇪 Ireland |
| SSEN Distribution | SSE | 🇬🇧 United Kingdom |
| ITC | Fortis | 🇨🇦 Canada |
| Hydro One Networks | Hydro One | 🇨🇦 Canada |
| J-POWER Transmission Network | J-POWER | 🇯🇵 Japan |
| Kansai Transmission and Distribution | Kansai Electric Power | 🇯🇵 Japan |
| Oncor | Sempra | 🇺🇸 United States |
| American Transmission Company | WEC Energy Group | 🇺🇸 United States |
About the owner: Ecopetrol
Ecopetrol is a state-owned company headquartered in Colombia. Brandtree records 6 brands under its control, and it is listed as NYSE: EC.
Ecopetrol's 2025 Form 20-F says the Colombian Nation holds 88.49 percent of its shares through the Ministry of Finance and Public Credit and that 11.51 percent trades on the Colombian and New York exchanges. It lists Reficar, Cenit and Esenttia as 100 percent subsidiaries, ISA at 51.4 percent and Ocensa at 72.65 percent. The 20-F also reports a 2026 agreement to buy a stake in Brazil's Brava Energia.
🇨🇴 ISA and other Colombian brands
Brandtree records a controlling owner for 99 brands that began in Colombia. 10 of them (10%) are now controlled by a company headquartered in another country; ISA is not one of them.
- Terpel — Terpel 🇨🇴
- Activade — Quala 🇨🇴
- Agua Cristal — Postobón 🇨🇴
- Aguila — AB InBev 🇧🇪
- Airplan — ASUR 🇲🇽
- Almendra Tropical — CasaLuker 🇨🇴
Frequently asked questions
Who is the parent company of ISA?
The parent company of ISA is Ecopetrol, a state-owned company headquartered in Colombia.
Is ISA Colombian?
Yes. ISA originated in Colombia and its owner, Ecopetrol, is also headquartered in Colombia.
Is ISA still owned by Ecopetrol?
Yes. As of 9 October 2026, ISA is still owned by Ecopetrol (51.4% stake). The ownership record was last checked against primary sources on that date.
Sources (1) & corrections
Last verified . Every ownership fact above is backed by one of these primary documents. Numbers in brackets in the text refer to this list.
- [1] Ecopetrol S.A. Annual Report on Form 20-F filed 2026-04-30 — SEC EDGAR, SEC Form 20-F, published 30 April 2026; retrieved 5 October 2026.
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