Reliable Robotics Raises $115M at $1B+ Valuation to Advance Pilotless Aircraft

Reliable Robotics, a Mountain View, California-based aviation technology startup, has raised an additional $115 million as part of its Series D funding round, bringing the total round size to $275 million and its valuation to more than $1 billion.

Announced on October 20, 2026, the latest funding comprises $90 million in equity led by returning investor Nimble Partners and a $25 million term loan from Silicon Valley Bank. The company previously announced $160 million in Series D funding in April 2026.

Founded in 2017 by Robert Rose and Juerg Frefel, Reliable Robotics is developing autonomous flight technology designed to let aircraft taxi, take off, navigate and land with reduced dependence on onboard pilots. The company is pursuing Federal Aviation Administration (FAA) approval for its system, initially targeting the Cessna 208B Grand Caravan, a widely used cargo aircraft.

The new capital will support aircraft fleet expansion, increased production capacity and additional engineering hires as the company works toward regulatory approval and commercial deployment.

Reliable Robotics' $115M Funding Round

The latest financing brings Reliable Robotics' Series D round to $275 million and takes its reported valuation above $1 billion.

Nimble Partners led the new equity investment. The round also includes a $25 million term loan from Silicon Valley Bank, meaning the entire $115 million is not equity financing.

The company says it has raised more than $380 million in equity to date. The latest funding follows the $160 million Series D financing announced in April 2026, when Bloomberg reported a valuation approaching $1 billion.

Additional investors in the October extension include Gideon Capital, RockCreek, Geek Ventures, Gold Hill Capital and Sparkwave Capital. Island Green Partners returned to participate, while Allen & Company also supported the financing.

Reliable Robotics has attracted backing from investors including Eclipse, Lightspeed, Coatue and Pathbreaker Ventures, alongside strategic and institutional investors such as RTX Ventures, AE Ventures, Socium Ventures and Presidio Ventures.

The investment will help finance the company's next stage of development, particularly the work required to move its autonomous flight technology through regulatory certification and into broader operations.

What Is Reliable Robotics Building?

Reliable Robotics is developing the Reliable Autonomy System, technology designed to automate the operation of existing aircraft.

Rather than building an entirely new aircraft, the company is adapting autonomous capabilities to established aircraft platforms. Its system is designed to manage multiple phases of flight, including taxiing, take-off, route management and landing.

The company says its technology can operate using existing airports and airspace without requiring changes to the US National Airspace System for commercial operations.

One of its main objectives is to make autonomous flight practical for cargo operations, where reducing operational constraints could eventually improve how aircraft are used to move goods.

Reliable Robotics completed its first autonomous test flight in 2019 using a Cessna 172 with nobody occupying the pilot seat, according to the source article.

However, demonstrating that an aircraft can fly autonomously is only one part of commercialisation. The company must also satisfy regulatory requirements for its equipment and the operations in which that equipment will be used.

FAA Certification Is the Critical Milestone

Reliable Robotics is pursuing FAA approval across four areas, according to CEO Robert Rose.

Its first product is designed to provide continuous autopilot engagement. It can manage engine start, taxiing, take-off and landing while a pilot remains inside the cockpit and interacts with the system through a touchscreen.

Rose expects the first system to receive regulatory approval within 18 to 24 months of the October 2026 announcement. That forecast points to a potential approval window between April and October 2028, although the timeline remains an expectation rather than a confirmed certification date.

Moving the pilot from the cockpit to a ground-control station is a longer-term objective, with Rose indicating that this capability is at least three years away.

Reliable is also developing an in-house solid-state radar after established suppliers declined to undertake the project. The company is targeting certification for the radar by the end of 2027.

Its fourth area involves Reliable Airlines, an Albuquerque-based cargo operator flying six Cessna Caravans six days a week. The company is working across both aircraft technology and operating models, which involve separate regulatory considerations.

The FAA has accepted Reliable Robotics' certification plan and its proposed method for demonstrating compliance for the system being developed for the Cessna 208B Grand Caravan, according to the article.

Why Autonomous Flight Could Matter for Cargo Aviation

Cargo aircraft are a central part of Reliable Robotics' commercial strategy.

The company is targeting the Cessna 208B Grand Caravan, an aircraft commonly used in cargo operations. Adapting an existing aircraft platform could allow autonomous systems to be introduced without requiring operators to replace their entire fleets with purpose-built autonomous aircraft.

Reliable Robotics says its system is designed to address two important aviation safety risks: loss of control and controlled flight into terrain. The latter occurs when an otherwise functioning aircraft unintentionally strikes terrain or an obstacle.

Its system combines autonomous flight capabilities with additional sensing technology intended to support safer aircraft operation.

These capabilities could eventually have applications beyond cargo aviation. Nimble Partners founder John Burbank has described the opportunity as extending to a system that could be adopted across different aircraft types, rather than a solution limited to a single aircraft.

Nevertheless, any broader adoption will depend on technical compatibility, certification requirements, operational economics and customer demand.

Military Contracts Provide Another Route to Deployment

Reliable Robotics is pursuing both commercial aviation and military applications.

The company has contracts with multiple branches of the US military and has completed several military airworthiness reviews with the US Air Force, according to the source article.

It was also selected for the FAA's Advanced Air Mobility Integration Pilot Program. The programme allows the company to conduct pre-certification cargo flights serving small and rural communities in New Mexico and Colorado.

In April 2026, Reliable reported commitments for more than 200 systems from commercial and military customers. The October funding announcement did not disclose revenue figures, and the source does not provide a breakdown of those commitments into completed sales or deployed systems.

Military work and permitted pre-certification operations could provide opportunities to test and develop the technology while the company continues its broader certification process.

However, these activities do not replace the separate regulatory approvals required for wider commercial autonomous flight.

Reliable Robotics Expands Its Team and Facilities

The company plans to use the latest funding to expand its aircraft fleet, increase production capacity and hire additional engineers.

Reliable Robotics has more than 250 employees, according to the article, and is recruiting across engineering roles.

It is also expanding its geographic presence. New offices in Seattle and San Diego will complement existing locations in Mountain View and San Martin, California, and Albuquerque, New Mexico.

Seattle is expected to host a centre of excellence for the company's radar programme, supporting development of the sensing technology used in its autonomous flight system.

These investments reflect the range of work required to commercialise autonomous aviation. The company must develop software, sensing hardware and aircraft integration capabilities while coordinating testing, production and regulatory compliance.

Competition in Autonomous Aviation

Reliable Robotics operates in a growing field of companies developing autonomous aircraft systems and related technologies.

Merlin, a Boston-based startup, develops autonomy software for existing aircraft and became publicly listed through a SPAC merger in March 2026. It subsequently announced an $80 million private investment in public equity in April.

Elroy Air is taking a different approach by developing its own heavy-cargo drone, the Chaparral. The company announced $175 million in financing commitments in September 2026 ahead of a proposed merger with Inflection Point Acquisition Corp. VII.

Joby Aviation has also expanded its autonomous flight capabilities through its acquisition of the autonomy division of Xwing in June 2024.

These companies differ in aircraft design, operating models, funding structures and intended markets. Their progress illustrates the range of approaches being explored to automate aviation, but it does not establish that one approach will necessarily succeed over the others.

For Reliable Robotics, the central opportunity is to bring autonomous capabilities to existing aircraft while navigating the demanding certification process associated with commercial aviation.

What Comes Next for Reliable Robotics?

Reliable Robotics' $115 million funding extension gives the company additional resources to develop its technology, expand its operations and pursue FAA approval.

The immediate priorities are advancing certification for its first autonomous flight system, developing its solid-state radar, expanding its fleet and preparing for customer deployments.

The company has already reported commitments for more than 200 systems and has military contracts, but it has not disclosed revenue figures in the latest announcement.

The next major milestones will be regulatory approval, sustained operational performance and evidence that customers can deploy the technology reliably and economically.

Autonomous aviation could eventually change how cargo aircraft are operated, but certification and commercial adoption remain substantial challenges.

Reliable Robotics now has a valuation above $1 billion and more than $380 million in reported equity funding behind it. The key question is whether it can turn that capital and its technical progress into a certified system operating at commercial scale.