The competitive landscape in autonomous driving is heating up.

Uber (UBER.US) has announced the conclusion of its Robotaxi (self-driving taxi) service partnership with Waymo, a unit of Google (GOOGL.US), in Phoenix, Arizona. This development marks the latest shift in a relationship where the two companies have been both collaborators and competitors. Phoenix was the market where Waymo first launched its Robotaxi service for paying passengers via its own app back in 2020. In 2023, the companies entered into a multi-year agreement, later integrating part of Waymo's autonomous fleet into the Uber app for rides. Under this arrangement, Waymo vehicles were utilized not only for passenger transport but also for on-demand food delivery. An Uber spokesperson described the Phoenix initiative as "a deliberately limited-scale pilot deployment, involving just over a dozen vehicles dedicated to the project." The company indicated plans to announce a new project in Phoenix with a different autonomous vehicle supplier but withheld further specifics.

According to Waymo, the Phoenix Robotaxi partnership concluded last month after collectively facilitating hundreds of thousands of trips. The food delivery collaboration had already ended in May 2025. Waymo stated that the vehicles from this project will be reassigned to support its delivery partnership with Uber's rival, DoorDash (DASH.US), and its public transit collaboration with Via Transportation (VIA.US) initiated last year. Phoenix users can still hail rides through the Waymo application. Reflecting on the partnership, a Waymo spokesperson noted, "It was a productive pilot that has paved the way for more expansion and collaboration globally in the future."

Market Scrutiny on Strategy

This termination represents the most recent chapter in the Uber-Waymo collaboration, which Wall Street has closely monitored as a key barometer for the success of Uber's strategy to build a Robotaxi aggregation platform. Since expanding their partnership to Austin and Atlanta in 2025, the companies have continued to increase fleet sizes and operational areas in those markets but have not announced plans for further city expansions. Concurrently, Waymo has expanded into Nashville, Miami, and other Texas cities, operating through other fleet management partners and competing directly with Uber for passengers in these areas.

This dynamic has heightened concerns among some analysts and industry observers. They worry that if Robotaxis achieve widespread adoption, and operators like Waymo or Tesla (TSLA.US) choose not to integrate their vehicles onto the Uber platform, it could negatively impact Uber's future growth prospects. Over the past 12 months, Uber's stock has declined by more than 18%, significantly underperforming the S&P 500's approximate 20% gain during the same period.

Uber's Counter-Strategy and Current Position

In response to these market concerns, Uber has recently secured several partnership agreements. The company is betting that autonomous driving technology will eventually become a standardized commodity and is positioning itself as the go-to platform for Robotaxi commercialization. To date, Uber has established collaborations with over a dozen autonomous vehicle companies, including Lucid Group (LCID.US), Nuro, Zoox (owned by Amazon), Avride, Baidu, and WeRide. However, Uber executives have indicated that most of these partnerships are still several years away from official launch or achieving significant scale.

In contrast, Waymo currently operates a fleet of over 3,000 autonomous vehicles across more than 10 U.S. cities.