WIWIN is a German crowdinvesting platform based in Mainz for sustainability projects: wind and solar parks, energy-efficient housing and green companies. It started in 2011 as juwi Invest GmbH and took the WIWIN name in 2016. In 2025 it merged with the property platform Zinsbaustein. Together they report more than €360 million placed across more than 250 projects (January 2026). Each offer carries WIWIN's own sustainability Impact Score, which says nothing about the risk of not being repaid.
You choose single projects and lend to the company behind each one, today mostly through digital bonds recorded on a blockchain, in the older book through subordinated loans. Some offers start at €100, most at €250, and usually up to €25,000 per project. Terms on current offers run from about two to six years; one earlier offer runs to 2035. There is no auto-invest. On 27 October 2026 the platform listed two bond offers, a wind farm repowering and a housing project, and one share offer.
WIWIN advertises up to 9.25% a year. The offers listed on 27 October 2026 paid 6.50% (wind farm, six years) and 8.50% plus a bonus (housing, to March 2028). These are promised interest rates on single projects, not results. WIWIN has never published what investors actually earned, or how much was lost on failed projects.
WIWIN publishes no default rate, no loss figure, no recovery figure and no statistics page. Independent tracking of the group's offerings points to 16 of about 130 in insolvency proceedings, 11 more behind on payments and one closed at a loss, about one in five in trouble (August 2026). In one solar case the insolvency court closed the proceedings because there were no assets left, so nothing came back. In April 2025 the specialist press reported that projects whose issuers were insolvent were labelled as successfully completed on WIWIN's site.
Usually nothing. You lend to a single project company without a mortgage or pledge, and often behind a bank. On the current housing bond, for example, investors rank behind a €4.5 million bank loan secured on the property; the only extra protection is a personal guarantee of €0.5 million from the developer's owner on a €1.2 million issue. There is no buyback, no reserve fund and no insurance, and the securities are not covered by deposit protection. No recovery figures are published. If a project company fails, you can expect to lose most or all of that investment.
The platform is run by wiwin GmbH (Kaiserslautern companies register, HRB 33266), whose founder Matthias Willenbacher has again been sole managing director since July 2026. WIWIN has no crowdfunding licence of its own. It works as a tied agent of Concedus GmbH, Nuremberg, a securities firm supervised by Germany's financial regulator BaFin, which is liable for the intermediation (on the BaFin register since 1 November 2023; checked 26 October 2026). WIWIN announced an EU crowdfunding licence for a group company in 2024, but no such licence is shown now. The group's accounts showed debts larger than its assets by about €3.9 million at the end of 2023.
WIWIN is paid by the companies raising money and does not publish how much. Depository fees charged by Baader Bank on WIWIN products are reimbursed to investors. Investors bear the costs of failed or reversed payments, and German taxes are deducted from interest at source.
There is no secondary market. Digital bonds can be transferred, but you must find a buyer yourself, and WIWIN warns of significant liquidity limits. Plan to keep your money in until the project repays.
Return: Medium — up to 9.25% a year advertised, with no measured return behind it. Risk: High (higher means more risk) — WIWIN publishes no default or loss figures, which is itself a warning sign; independent tracking points to about one in five offerings in trouble, the loans are mostly unsecured, and it has no licence of its own. Risk-return: Low — a medium promised rate does not make up for that level of risk.
License / Regulation: No licence of its own. wiwin GmbH is a tied agent (§ 3(2) German Securities Institutions Act, WpIG) of Concedus GmbH, Nuremberg, a securities institution supervised by BaFin, which is liable for the intermediation; BaFin register number 80178828, active since 1 November 2023 (checked 26 October 2026). No crowdfunding licence is shown for WIWIN.
Only through another firm. WIWIN has no crowdfunding licence of its own. It works as a tied agent of Concedus GmbH, Nuremberg, a securities firm supervised by BaFin, which is liable for the intermediation (checked 26 October 2026).
WIWIN takes no payments itself. You pay the issuer by direct debit or transfer, sometimes through an external payment provider it does not name. Digital bonds are kept by the custodian Tangany GmbH; conventional securities by Baader Bank AG. Deposit protection does not apply.
€100 on some offers, €250 on most. You can usually invest up to €25,000 per project.
WIWIN advertises up to 9.25% a year; offers on 27 October 2026 paid 6.50% and 8.50% plus a bonus. It publishes no realised return and no default or loss figures. Independent tracking points to 16 of about 130 group offerings in insolvency proceedings and 11 more behind on payments (August 2026).
Usually nothing. You lend to a single project company without a mortgage or pledge, often ranking behind a bank. Some offers add a capped personal guarantee from the developer's owner. There is no buyback, reserve fund or insurance, and no recoveries have been published.
Not easily. There is no secondary market; you can transfer digital bonds only if you find a buyer yourself. Expect to stay in until the project repays.
WIWIN is paid by the companies raising money, and does not say how much. Baader Bank depository fees are reimbursed to investors. You pay the costs of failed or reversed payments, and German taxes are deducted from interest.
If a project company fails, you are an unsecured creditor in its insolvency and may lose everything; in one solar case nothing came back. If WIWIN failed, your bonds remain claims on the project companies, held at the custodian, but you would lose the platform's servicing. No compensation scheme covers you.
No licence is shown now. WIWIN announced an EU crowdfunding licence for a group company in 2024; that company was renamed a service company in July 2026. Today the platform works as a tied agent of Concedus GmbH, so the EU crowdfunding rules do not govern current offers.
