Operator Stack

Operator Stack is a venture capital firm established in 2019 and located in San Francisco, California. The firm focuses on early-stage investments, particularly in pre-seed and Series A funding rounds, targeting companies across various sectors including logistics, supply chains, fintech, and B2B SaaS. Operator Stack aims to support innovative technology ventures by leveraging its network of operators and industry expertise to foster growth and development in these key areas.

Natarajan Subbiah

Co-Founder and General Partner

12 past transactions

OpenInfer

Seed Round in 2025
OpenInfer specializes in developing an AI inference engine tailored for edge applications. This engine empowers businesses to create intelligent agents and workflows that function on diverse hardware, ensuring data privacy, reducing costs, and providing reliable, long-chain reasoning capabilities.

Nue

Series A in 2025
Nue is a prominent revenue management platform that specializes in automating sales and finance processes for businesses of all sizes. Its comprehensive suite of features includes automated pricing and quoting, sales enablement tools, and financial reporting and analytics. By leveraging usage-based billing and accurate analytics, Nue's platform enhances the efficiency of sales strategies and optimizes pricing models. This enables companies to improve their cash flow and streamline their operations, ultimately accelerating sales and fostering growth.

Vooma

Series A in 2024
Vooma is a back-office automation platform that specializes in automated order entry for brokers and carriers in the freight industry. The platform employs artificial intelligence and web-based technology to streamline document management services, allowing users to efficiently handle and automate freight orders. By providing tools that enhance operational efficiency, Vooma enables brokers and carriers to increase their order volume without the need to hire additional staff. This focus on automation and efficiency positions Vooma as a key player in simplifying and optimizing freight operations.

Outgo

Venture Round in 2024
Outgo Network Inc. is a Seattle-based company that offers an all-in-one vertical banking solution specifically designed for freight carriers. Founded in 2022 by former executives from leading transportation firms, including Uber and Convoy, Outgo provides a suite of products that automate essential financial processes such as broker setups, invoicing, factoring, collections, accounting, and tax services. By eliminating the need for contracts and minimums, Outgo empowers carriers to gain greater control over their finances, addressing a long-standing challenge in the industry.

Distributional

Seed Round in 2023
Distributional is a company focused on enhancing the safety, reliability, and security of artificial intelligence systems. It develops an AI testing and evaluation platform that offers tools for continuous monitoring, generating test cases, and analyzing results. This platform ensures that AI systems perform as intended, allowing organizations to trust their AI implementations. By providing these capabilities, Distributional enables customers to deploy AI products more frequently and harness the full potential of AI within their operations.

Parade

Venture Round in 2023
Parade is a freight brokerage capacity management platform that specializes in the long-haul trucking industry. Established in 2015 and headquartered in San Francisco, California, the company operates an on-demand mobile marketplace that connects carriers seeking backhaul opportunities. Parade's technology streamlines the booking process by enabling carriers to find and book loads more efficiently while also notifying them of potential delays, thus helping to mitigate additional costs such as storage fees and detention charges. By integrating with existing tools, Parade enhances the management of carrier relationships, availability, and pricing, making it a valuable resource for freight brokerages aiming to optimize their operations and increase load bookings.

Bluedot

Seed Round in 2023
Bluedot is a marketplace focused on enhancing electric vehicle (EV) charging accessibility. Founded in 2019 and headquartered in San Francisco, California, the company offers a software and hardware integrated system through a mobile application. This platform allows charger owners to schedule and share their charging spots, generating income while facilitating EV owners in locating both public and private charging units. The application not only enables users to track real-time availability of charging stations but also supports fleet owners in managing charge schedules, statistics, and maintenance remotely. Additionally, it serves as a universal charging payment and rewards platform for individual and fleet drivers, promoting the adoption of electric vehicles.

Nue

Seed Round in 2023
Nue is a prominent revenue management platform that specializes in automating sales and finance processes for businesses of all sizes. Its comprehensive suite of features includes automated pricing and quoting, sales enablement tools, and financial reporting and analytics. By leveraging usage-based billing and accurate analytics, Nue's platform enhances the efficiency of sales strategies and optimizes pricing models. This enables companies to improve their cash flow and streamline their operations, ultimately accelerating sales and fostering growth.

NorthOne

Series B in 2022
NorthOne Inc., established in 2016 with headquarters in Toronto, Canada, specializes in digital banking solutions. The company offers a mobile-first API-based bank account, accessible via iOS, Android, and desktop platforms, catering primarily to startups, freelancers, and small businesses across America. NorthOne's platform enables users to manage finances and transactions efficiently, with features such as automated envelope creation for expenses like taxes, payroll, and rent, along with seamless integration of payment processing tools via Stripe. The company aims to simplify financial management, allowing businesses to focus more on their core operations.

Turaco

Series A in 2022
Turaco Inc., established in 2018 and headquartered in Wilmington, Delaware, is an insurance technology company specializing in providing affordable health and life insurance solutions to low-income individuals. It offers a range of products, including health loans and insurance, delivered through a user-friendly mobile application and online platform. Turaco's mission is to make healthcare financing accessible and affordable, enabling customers to manage risks and obtain necessary medical care at budget-friendly monthly premiums.

Stake

Series A in 2022
Stake enables renters to receive cash back rewards for paying their rent. Stake is on a mission to make renting financially rewarding, build renters’ savings with no fees or debt accumulation, and empower today’s owners to create financially safe and secure rental communities. Stake reduces downtimes and marketing costs while boosting top-line revenue with retention and renewals. Its data-powered rewards lessen the overall cost of incentives and concessions by over 50% and increase leasing velocity by 2x.

Greenscreens AI

Seed Round in 2022
Greenscreens.ai is a developer of AI-driven freight software aimed at enhancing the profitability of third-party logistics providers (3PLs). By utilizing machine learning and proprietary datasets, the company offers tools that enable users to confidently and efficiently price loads, ultimately increasing broker margin contributions. Its software provides real-time benchmarking and market predictions, allowing users to adapt to changing market trends quickly. This approach not only improves operational productivity but also reduces the time and uncertainty associated with pricing and booking loads. Through its innovative solutions, Greenscreens.ai helps clients identify missed revenue opportunities and empowers teams to operate at their highest effectiveness.
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