This brief covers Duke Energy's Form 8-K filings from February 2026 through September 2026.

## Filings that contain financial statements

- **Form 8-K, accession 0001326160-26-000007 (filed February 10, 2026).** Exhibit 99.1 is Duke Energy's fourth-quarter and full-year 2025 earnings release, which includes the Consolidated Statements of Operations and Condensed Consolidated Statements of Cash Flows for the years ended December 31, 2025, 2024 and 2023 and the Consolidated Balance Sheets as of December 31, 2025 and December 31, 2024, plus reported-to-adjusted earnings reconciliation tables (segment income and EPS) for the three months and year ended December 31, 2025, with December 31, 2024 comparatives, and an effective-tax-rate reconciliation for the same periods.
- **Form 8-K, accession 0001326160-26-000037 (filed August 4, 2026).** Exhibit 99.1 is Duke Energy's second-quarter 2026 earnings release, which includes the Condensed Consolidated Statements of Operations, Condensed Consolidated Balance Sheets, and Condensed Consolidated Statements of Cash Flows for the three and six months ended June 30, 2026 (with June 30, 2025 and December 31, 2025 comparatives), plus segment-level detail and a GAAP-to-adjusted EPS reconciliation.
- **Form 8-K, accession 0001326160-26-000022 (filed May 5, 2026).** Exhibit 99.1 is Duke Energy's first-quarter 2026 earnings release, which includes the Condensed Consolidated Statements of Operations, Condensed Consolidated Balance Sheets, and Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2026 (with March 31, 2025 comparatives), plus segment-level detail and a GAAP-to-adjusted EPS reconciliation.
- **Form 8-K, accession 0001104659-26-038007 (filed April 1, 2026, co-filed by Piedmont Natural Gas Company, Inc.).** Exhibit 99.1 contains unaudited pro forma consolidated financial statements for Piedmont Natural Gas Company, Inc. — a pro forma Statement of Operations for the year ended December 31, 2025 and pro forma Balance Sheet as of December 31, 2025 — reflecting the completed sale of its Tennessee natural gas business. These are subsidiary-level pro forma statements, not Duke Energy's consolidated results.

## Earnings

**Second-quarter 2026 (August 4, 2026).** Duke Energy reported second-quarter 2026 EPS of $1.38 (GAAP) and adjusted EPS of $1.43, up from $1.25 reported and adjusted in the second quarter of 2025. The difference between reported and adjusted results was a $0.05 per-share charge tied to the North Carolina rate-case regulatory settlements described below. The company reaffirmed full-year 2026 adjusted EPS guidance of $6.55 to $6.80 and its long-term adjusted EPS growth target of 5% to 7% through 2030. (Form 8-K, accession 0001326160-26-000037.)

**First-quarter 2026 (May 5, 2026).** Duke Energy reported first-quarter 2026 EPS of $1.97 (GAAP) and adjusted EPS of $1.93, up from $1.76 reported and adjusted in the first quarter of 2025. Reported results included gains on the Piedmont Tennessee and renewable natural gas asset sales, charges from legal and regulatory settlements, and discontinued-operations results, which were excluded from the adjusted figure. The company reaffirmed the same full-year 2026 guidance range. (Form 8-K, accession 0001326160-26-000022.)

**Fourth-quarter and full-year 2025 (February 10, 2026).** Duke Energy reported full-year 2025 reported and adjusted EPS of $6.31 (there was no difference between GAAP reported and adjusted results for the year), up from reported EPS of $5.71 and adjusted EPS of $5.90 in 2024. The company said higher full-year adjusted results were primarily driven by recovery of growing infrastructure investments and growth in its service territories, partially offset by higher O&M, interest expense, property taxes and depreciation on a growing asset base. Fourth-quarter 2025 reported EPS was $1.50, compared to $1.54 in the fourth quarter of 2024, and fourth-quarter 2025 adjusted EPS was also $1.50, compared to $1.66 a year earlier; the company attributed the lower adjusted quarterly results primarily to higher O&M, interest expense, depreciation on a growing asset base and Duke Energy Foundation contributions, along with a higher effective tax rate, partially offset by recovery of infrastructure investments. Duke Energy introduced 2026 adjusted EPS guidance of $6.55 to $6.80 and extended its long-term adjusted EPS growth rate of 5% to 7% through 2030, off the 2025 guidance range midpoint of $6.30, citing a $103 billion five-year capital plan expected to drive 9.6% earnings base growth through 2030. (Form 8-K, accession 0001326160-26-000007.)

## Mergers, acquisitions and divestitures

**Completion of Piedmont Tennessee sale to Spire (March 31, 2026).** Piedmont Natural Gas Company, Inc., a wholly owned Duke Energy subsidiary, completed the previously announced sale of its Tennessee natural gas local distribution business to Spire Tennessee Inc. for $2.48 billion in cash, subject to customary purchase-price adjustments. Roughly $800 million of proceeds was used to pay down Piedmont debt; the remainder was earmarked to help fund Duke Energy's capital plan. (Form 8-K, accession 0001104659-26-038007.)

**Minority investment in Duke Energy Florida by Brookfield affiliate (first closing March 3, 2026).** Duke Energy and its subsidiaries completed the initial closing of a previously announced transaction in which an affiliate of Brookfield Super-Core Infrastructure Partners (through Peninsula Power Holdings L.P.) acquired a 9.2% membership interest in Florida Progress, LLC (the holding entity for Duke Energy Florida) for approximately $2.8 billion. Under the investment agreement, the investor is scheduled to make additional investments of $200 million (by December 31, 2026), $500 million (by June 30, 2027), $1.5 billion (by December 31, 2027) and $1 billion (by June 30, 2028), which would raise its stake toward an anticipated 19.7% ownership, for an aggregate investment of $6 billion across the full series of closings. The investor received limited governance rights, including two of eleven board seats at Florida Progress. On February 17, 2026, the U.S. Nuclear Regulatory Commission issued a written threshold determination that the transactions do not constitute a transfer of control of any NRC-issued license, which was the final condition to the first closing, clearing the way for the parties to target a March 3, 2026 closing date. (Form 8-K filings, accessions 0001104659-26-022610 and 0001104659-26-017086.)

## Capital actions

**Equity units offering (priced August 10, 2026; closed August 13, 2026).** Duke Energy issued and sold 40 million Corporate Units (including 5 million from the underwriters' fully exercised over-allotment option) at $50 per unit, raising $2.0 billion. Each unit combines a stock purchase contract requiring the holder to buy Duke Energy common stock by August 1, 2029, and an interest in 4.85% Remarketable Senior Notes due 2032 and 2036; total annual distributions are 7.75% of the stated amount. (Form 8-K, accession 0001104659-26-095903.)

**At-the-market equity distribution program (March 6, 2026).** Duke Energy entered into an Equity Distribution Agreement with a syndicate of banks establishing an at-the-market program under which it may sell up to $6.0 billion of common stock over time, including through forward sale arrangements. (Form 8-K, accession 0001104659-26-024729.)

**Convertible senior notes due 2029 (announced March 9, 2026; upsized and priced March 10, 2026; closed March 12, 2026).** Duke Energy issued $1.5 billion aggregate principal amount of 3.000% Convertible Senior Notes due 2029, at an initial conversion price of approximately $160.57 per share. The offering was initially announced at $1.0 billion on March 9, 2026, upsized and priced at $1.3 billion on March 10, 2026, and closed on March 12, 2026 at $1.5 billion, including $200 million purchased on the initial purchasers' full exercise of their option to buy additional notes. Net proceeds were earmarked to repay $1.725 billion of the company's existing 4.125% convertible notes maturing in April 2026. (Form 8-K filings, accessions 0001104659-26-024945, 0001104659-26-025530 and 0001104659-26-027080.)

**Credit facility extension (March 16, 2026).** Duke Energy and several utility subsidiaries amended their existing credit agreement to extend its termination date by one year, from March 16, 2030 to March 16, 2031. (Form 8-K, accession 0001104659-26-028490.)

## Regulatory

**North Carolina rate case settlements — Duke Energy Carolinas and Duke Energy Progress.** Both utilities settled their pending 2025 North Carolina rate cases (originally filed November 20, 2025) during the second and third quarters of 2026:
- Duke Energy Carolinas reached a series of settlements with the North Carolina Public Staff resolving its pending 2025 rate case: a partial stipulation on July 2, 2026 resolving certain cost and accounting items (approximately $10 million of the one-time charges below); a storm cost stipulation on July 6, 2026 resolving Hurricane Helene and Winter Storm Fern cost recovery and withdrawing the company's storm reserve funding request; and a comprehensive revenue-requirement settlement on July 17, 2026 that set a 9.8% return on equity, a historic base case retail rate base of approximately $25.7 billion, roughly $3.8 billion in multi-year rate plan capital, and a combined revenue-requirement increase of $496 million over two years. Collectively, these stipulations are expected to generate about $40 million of one-time pretax charges in 2026, treated as special items; Duke Energy Carolinas recorded $29 million of that charge in the second quarter of 2026. (Form 8-K filings, accessions 0001104659-26-080476 and 0001104659-26-084653; Form 10-Q, accession 0001326160-26-000040.)
- Duke Energy Progress filed a comprehensive revenue-requirement settlement on August 5, 2026 on similar terms — a 9.8% return on equity, a historic base case retail rate base of approximately $17.8 billion, roughly $3.4 billion in multi-year rate plan capital, and a combined revenue-requirement increase of $338 million over two years — expected to generate about $30 million of one-time pretax charges in 2026, treated as special items. (Form 8-K, accession 0001104659-26-091159.)
Both settlements remain subject to North Carolina Utilities Commission approval.

## Board and governance

**Annual meeting results (May 7, 2026).** At Duke Energy's 2026 annual meeting of shareholders, all 14 director nominees were elected, shareholders ratified Deloitte & Touche LLP as independent registered public accounting firm for 2026, and the advisory vote on executive compensation passed. A management proposal to amend the certificate of incorporation to eliminate supermajority voting requirements failed, receiving support from 66.39% of shares outstanding against the 80% required for approval. (Form 8-K, accession 0001104659-26-060251.)

**New independent director (September 24, 2026; effective September 28, 2026).** Duke Energy's board appointed Joyce Mullen, former president and CEO of Insight Enterprises, Inc., to the board and to its Audit Committee and Operations and Nuclear Oversight Committee. (Form 8-K, accession 0001104659-26-110588.)