Constellation Energy Corporation

The full register, from 13F filings

The Register tab above is hand research: a dozen holders, each traced to the filing it came from. This asks the same question of the whole market for the quarter ended 31-mar-2026, where 1,868 managers reported a position. Broad where the research is deep, and shallow in the ways a 13F always is.

Built from 13F filings, which report US listed, long, US custodied positions only. A register from this source is a floor rather than a level: a holder's true position can be far larger, as BlackRock's ASML stake shows at 1.28m shares in a 13F against 26.3m in its 13G/A. Holdings held through derivatives, outside US custody, or below a manager's reporting obligation do not appear. Where a holder is marked as a family, its total sums several separate filing entities and describes something no single filing describes; the constituent entities and their share counts are listed so the total can be checked. That roll-up can legitimately exceed the family's own Schedule 13G, because a 13G is filed by one legal entity: Vanguard reports Alphabet through ten advisory entities, and The Vanguard Group Inc itself reported zero after its January 2026 disaggregation.

What a reader needs to know to read these numbers

• Constellation's acquisition of Calpine Corporation closed 7 January 2026 (the Acquisition Date, per Q2 FY2026 10-Q Note 2, Mergers, Acquisitions, and Dispositions). Consideration was $4.5 billion base cash plus CEG Parent common stock priced off the $354.58 closing price on 6 January 2026, with $11.1 billion of goodwill provisionally allocated to the new Calpine reportable segment. Calpine is now a wholly owned, consolidated subsidiary and is excluded from holdings per the brief. shares_outstanding used here (354,307,379 as of 31 July 2026, Q2 FY2026 10-Q cover) reflects the post-Calpine share count; SEC XBRL shows the jump from 312,290,080 (31 Oct 2025, pre-merger) to 361,990,335 (1 Feb 2026, immediately post-merger) to 354,307,379 (31 Jul 2026, after subsequent accelerated share repurchases).
• Co-owned nuclear plants are excluded from holdings, the same treatment Southern Company used for Vogtle. Constellation's material undivided ownership interests in jointly owned nuclear plants at 31 December 2025 (FY2025 10-K, Note 9, Jointly-Owned Electric Plants) were Nine Mile Point Unit 2 (82.00%, Constellation-operated), Quad Cities (75.00%, Constellation-operated), Peach Bottom (50.00%, Constellation-operated), South Texas Project/STP (44.00%, operated by STPNOC, a jointly owned operating company) and Salem (42.59%, operated by PSEG Nuclear). These are direct undivided asset interests, proportionately consolidated on Constellation's own balance sheet, not equity holdings in a company, so none is recorded as a holding. Conversely, other co-owners' undivided interests in the Constellation-operated units (Nine Mile Point Unit 2, Quad Cities, Peach Bottom) are those other parties' interests, not Constellation holdings, and are likewise excluded.
• Nuclear decommissioning trust (NDT) fund investments ($20,583 million at 30 June 2026 and $19,396 million at 31 December 2025, per the Q2 FY2026 10-Q fair value table) are excluded from holdings: they are restricted regulatory funds held to satisfy future decommissioning obligations, not strategic equity stakes.
• Equity method investments and non-marketable equity stakes are combined balances that were searched but not split by investee in either the FY2025 10-K or the Q2 FY2026 10-Q. 'Equity method investments' rose from $3 million (31 Dec 2025) to $45 million (30 Jun 2026); 'Equity investments without readily determinable fair values' (the measurement-alternative / non-marketable line) were $109 million (31 Dec 2025) and $122 million (30 Jun 2026). Neither filing names the investee(s) behind either balance anywhere that was found. Per the brief's rule on combined, unsplit balances, no individual holding is recorded; the figures are noted here and in unknowns instead.
• CRP (a wind and solar project entity in which Constellation holds a 51% equity interest and consolidates as primary beneficiary of the VIE, per FY2025 10-K Note 21) is the reverse case: Constellation is the CONTROLLING party, and outside tax-equity investors hold noncontrolling interests in CRP, the same logic that excludes Southern Power's tax-equity partnerships from Southern's own holdings list. Not recorded as a Constellation holding in others.
• Unconsolidated VIEs, per FY2025 10-K Note 21, consist of energy purchase and sale (power purchase agreement) contracts, not equity investments; Constellation states it has 'no exposure to loss as we do not have a carrying amount in the equity investment VIEs.' No holding is recorded for these.
• Calpine's own minority ownership interest in the Gregory Power Plant (ERCOT) was divested in January 2026, required by the DOJ's Calpine/Constellation merger-clearance resolution. This was a pre-existing Calpine asset unwound at closing, not a Constellation holding that was acquired or retained.
• ECP ControlCo, LLC's 7.0% register position originates from the Calpine acquisition, not open-market accumulation: ECP (Energy Capital Partners) was a private-equity sponsor and owner of Calpine before the merger and received Constellation Energy stock as merger consideration. See the register row's method_note for the sourcing caveat: the underlying Schedule 13G cited by the proxy could not be independently located on EDGAR within the time budget.
• Capital International Investors' (Capital Group) 5.5% position is likewise sourced only to the proxy's citation of its Schedule 13G/A; that filing could not be independently located on EDGAR within the time budget, and no Capital Group entity's own Form 13F-HR was checked in this task.
• The proxy's own 5%-holder percentage table (DEF 14A footnote 6) is denominated on 313,309,685 shares of common stock outstanding as of 2 March 2026; used here for the ECP and Capital International Investors rows and, by the same denominator, for the individually named insider rows (the proxy itself does not state individual insider percentages, only 'less than 1%' for the group). This 313,309,685 figure is notably lower than the SEC XBRL cover-page share counts filed close to the same period: 361,990,335 as of 1 February 2026 (FY2025 10-K cover) and 361,190,063 as of 30 April 2026 (Q1 FY2026 10-Q cover). The source of that discrepancy was not resolved in this task and is flagged here rather than silently reconciled; it may reflect a weighted or as-of-record-date share count distinct from the cover-page count, but that is not confirmed.
• Vanguard's January 2026 reorganisation: per the brief's guidance, only one Vanguard row is used here (its last Form 13F-HR, for the quarter ended 31 December 2025, filed under CIK 0000102909). Vanguard filed Form 13F-NT (notice, no holdings) for the quarters ended 31 March and 30 June 2026, consistent with an internal realignment that split its reporting among several new filers (the same pattern noted in the Broadcom and Southern Company research files); no attempt was made to identify or sum the successor filers within the time budget, so Vanguard's true current Constellation Energy position is very likely different from the 31 December 2025 figure used here.
• The institutional 13F rows mix two denominators, deliberately, rather than mixing underlying share counts. BlackRock through JPMorgan (6 of 7 filed-13F rows) use 354,307,379 shares outstanding as of 31 July 2026 (Q2 FY2026 10-Q cover), matching each manager's own 30 June 2026 quarter-end 13F-HR. The Vanguard row uses 312,290,080 shares outstanding as of 31 October 2025 (Q3 FY2025 10-Q cover), the closest pre-Calpine share count to Vanguard's own pre-Calpine, 31 December 2025 13F-HR date.
• Constellation has a single class of common stock, no par value, one vote per share. There is no dual-class structure or founder/family control block: it was spun off from Exelon Corporation in February 2022, and the largest individual insider holding (Robert J. Lawless, 161,967 shares) is 0.052% of the company.
• No Schedule 13G or 13D has been recorded against Constellation Energy (CIK 0001868275) in EDGAR's browse-edgar subject-company index since 14 November 2024 (checked 17 August 2026), even though Constellation's own 2026 DEF 14A cites two more recent Schedule 13G filings (ECP ControlCo, 14 January 2026; Capital International Investors, 13 February 2026). This is why the 13F route was used for the other register rows, consistent with the Broadcom and Southern Company research files.
• Market capitalisation of $100,090,000,000 is the rounded figure published on stockanalysis.com as of the 14 August 2026 close ($282.50/share); it was not independently re-derived from shares outstanding and a separate share price in this research.