Sixt SE (Sixt) provides vehicle rental and leasing services. The company offers a range of services including car rental, commercial vehicle rental, car sharing, car subscriptions, charging solutions, and transfer services. As of December 2025, the company had 2,274 rental offices, including franchisees in 100 countries. In FY2025, the company operated a fleet of 365,900 vehicles, which included 196,900 vehicles owned by the company. Sixt offers a comprehensive portfolio of mobility services under various brands and products. The core product is SIXT rent, which provides car rental services at over 2,000 branches in more than 100 countries. The company also offers SIXT van & truck for commercial vehicle rentals, SIXT share for car sharing services, SIXT+ for car subscriptions, and SIXT ride for professional driving and chauffeur services. Additionally, SIXT charge provides a charging solution for electric vehicles.

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Sixt SE pursues a consistent digitalisation strategy that includes the product portfolio, sales channels, and operational business processes. The company leverages the latest technological developments and digital services to provide fast, flexible, and convenient solutions to its customers. Sixt SE places significant importance on its technological expertise and development activities for business success. The research and development activities are organized under SIXT TECH, which is divided into Product Divisions and Enabling Divisions. The Product Divisions focus on developing and optimizing mobility solutions and increasing internal efficiency, while the Enabling Divisions handle digital security, internal IT infrastructure, the company's cloud platform, and technical support for specialist departments. The R&D unit of the company is SIXT TECH. The unit is responsible for managing the company's R&D activities through its subdivisions: Product Divisions and Enabling Divisions. The Product Divisions aim to develop and optimize mobility solutions and enhance internal efficiency. The Enabling Divisions are tasked with ensuring digital security, maintaining internal IT infrastructure, managing the cloud platform, and providing technical support to specialist departments. They also ensure that the IT infrastructure at branches and headquarters is up to date. In 2025, an average of 562 employees worked in the SIXT TECH division at the development centres in Germany, India, Ukraine and Portugal. In FY2025, the company spent EUR37.8 million on R&D, which accounted for 0.9% of the company’s revenue.