Sono Motors Files for Insolvency a Second Time in Three Years, Halts Operations – Sono Solar Technology Portfolio Up for Sale

Munich – Former solar car pioneer Sono Motors has filed for insolvency for the second time in just a few years, this time discontinuing its operating business entirely. After restructuring once already in 2023/2024, the company's subsequent business model as a solar supplier to vehicle fleets also failed to secure viable follow-on financing.

Sono Motors had already applied for protective shield proceedings in May 2023, placing itself under creditor protection for the first time. In February 2024, the Munich insolvency court confirmed a restructuring plan under which the company abandoned its own electric vehicle project and repositioned itself as a supplier of solar technology to vehicle manufacturers and fleet operators.

From Own Electric Vehicle to Solar Supplier – This Approach Also Failed

The planned series production of the Sion solar electric vehicle, which Sono Motors had been developing since 2016, never materialized. Following the protective shield filing, the Munich Local Court opened insolvency proceedings under self-administration on September 1, 2023. A financing agreement concluded in February 2024 with YA II PN, Ltd. ("Yorkville"), a fund managed by US investment firm Yorkville Advisors Global, subsequently enabled the company to continue developing its B2B business in solar integration and charging electronics for vehicle manufacturers and fleet operators.

As of July 31, 2026, Sono Motors GmbH has discontinued this operating business and has again opened insolvency proceedings. According to the company, intensive talks with investors failed to produce viable financing.

Sono Group N.V. Exits for One Euro

The decisive step was taken by parent company Sono Group N.V. The listed group decided in March 2026 to end all further financing commitments to its subsidiary and to begin exiting the solar business.

The move was completed on May 4, 2026, when Sono Group N.V. transferred its stake in Sono Motors GmbH for a purchase price of one euro to companies controlled by managing directors Denis Azhar and Jan Schiermeister.

The group also assigned repayment claims from shareholder loans totaling around EUR 10.5 million to the new owners for a further one euro, subject to a two-year standstill period during which the claims cannot be called due. Since the divestment, Sono Group N.V. no longer holds any shares in Sono Motors GmbH and, according to the company, bears no further operational obligations toward it.

Technology Portfolio Offered for Sale in Three Packages

Sono Motors GmbH managing directors Denis Azhar and Jan Schiermeister are now offering Sono Solar's core technology portfolio to potential buyers. The offer covers three areas: solar integration for the Sion vehicle model, power electronics including solar charge controllers for vehicles, and Solar Data Services.

The sale is to include intellectual property, hardware components and technical documentation. "At the same time, we know the value of the technology our team has built. A decade of solar mobility know-how is truly unique", said Denis Azhar, Managing Director of Sono Motors GmbH. Jan Schiermeister, Managing Director of Sono Motors GmbH, addressed the company's customers, partners and employees, stating: "We remain convinced that solar will be an integral part of vehicles in the future."

Source: IWR Online, 06 Aug 2026