Private company
Who owns Alto Maipo SpA
One company in the researched set discloses a stake in Alto Maipo SpA, none of it sized by anyone who discloses it. Alto Maipo SpA is private, so no 13F reports it: a 13F covers exchange listed positions only. These figures exist because each holder disclosed the stake in its own filings.
Alto Maipo SpA - Profile
- Type
- subsidiary
- Based in
- Chile
Alto Maipo SpA is the Chilean special purpose company that built and operates the Alto Maipo hydroelectric complex on the upper Maipo river in the San José de Maipo district, about 50 kilometres southeast of Santiago. The scheme is run of river with no dam: it takes water from the Volcán, Yeso and Colorado basins through roughly 67 kilometres of tunnels to two underground powerhouses, Alfalfal II at 264 MW and Las Lajas at 267 MW, for a combined 531 MW and a design output near 2,350 GWh a year. Construction started in 2013 and cost overruns led the company to file for Chapter 11 in Delaware in November 2021, restructuring more than $2 billion of senior secured debt before emerging in May 2022. Both units entered commercial operation in early 2022 but shut down within months after rock falls in the Las Lajas intake tunnel. Las Lajas restarted in March 2026 while repairs to the Alfalfal II tunnel system continue.
Source
Alto Maipo SpA files nothing with the SEC, so none of this comes from a filer record. The description was written for this site in August 2026 from Alto Maipo Hydroelectric Power Project (NS Energy), Alto Maipo emerges from chapter 11 (Davis Polk) and Central Las Lajas de Alto Maipo vuelve a operar tras desconexión en 2022 (La Tercera). The ownership figures below come from the holders' filings instead, and are sourced row by row.
The disclosed stakes
One row per position. Where a holder reports the same company in two share classes, both rows are shown rather than summed, because the class is part of a position's identity.
Where each figure comes from
A private stake has no ownership form behind it, so the source is always the holder's own filing or disclosure. Anything modelled says so, with the arithmetic.
- The AES Corporation, as of 30 Jun 2026. Despite holding 99% of the economic interest, AES does NOT consolidate Alto Maipo: post-2022 Chapter 11 restructuring, Alto Maipo is a VIE and 'the Company lacks the power to make significant decisions' so does not meet the primary-beneficiary test. AES elected the fair value option to account for its investment. The 10-Q states plainly: 'As of June 30, 2026 and December 31, 2025, the fair value is insignificant,' with no dollar figure given, so value_usd is left null rather than assumed to be zero or modelled. source
What this page is not
It is not a complete register. It lists the holders who happen to be inside the researched set and disclosed the stake themselves. A private company can have many other shareholders, and nothing here rules them out: venture investors, founders and employees usually appear in no public filing at all. Percentages are of Alto Maipo SpA where a holder stated one, and are missing where no holder did.