Altimeter Capital

Altimeter Capital is a technology-focused investment firm with offices in Menlo Park, California, and Boston, Massachusetts. Founded in 2008, the firm concentrates on technology companies across North America and pursues early-stage investments in the sector.

Jamin Ball

Partner

John Kiernan III

CFO and Partner

Thomas Reiner

Partner

Gwendolyn Umbach

Investor

Kevin Wang

Partner

Ram Woo

Partner

Past deals in Real Time

Hammerspace

Series B in 2025
Hammerspace is a software-defined data orchestration and storage company that provides a unified, cross-platform file access solution through a Parallel Global File System. This system spans diverse storage types, vendors, locations, and clouds, creating a global namespace that enables direct multi-protocol access to all files regardless of storage or geography. A common metadata layer is shared across users and locations, so files are accessed via a single metadata view rather than duplicated copies. When local processing is needed, instantiation of a file is orchestrated in the background and remains transparent to users. The platform virtualizes and abstracts data from underlying infrastructure, delivering file data as a service to applications and data services, supporting hybrid IT environments with minimal disruption to workloads.

LiveKit

Series B in 2025
LiveKit is an open-source real-time communications platform that enables developers to build and scale voice and video applications. The platform provides horizontally scalable infrastructure, purpose-built software development kits, and multi-platform support, allowing teams to create seamless, low-latency real-time experiences across devices and environments. By focusing on real-time delivery and cross-platform compatibility, LiveKit serves as a backend foundation for applications requiring dependable voice and video communication capabilities.

LiveKit

Venture Round in 2024
LiveKit is an open-source real-time communications platform that enables developers to build and scale voice and video applications. The platform provides horizontally scalable infrastructure, purpose-built software development kits, and multi-platform support, allowing teams to create seamless, low-latency real-time experiences across devices and environments. By focusing on real-time delivery and cross-platform compatibility, LiveKit serves as a backend foundation for applications requiring dependable voice and video communication capabilities.

ClickHouse

Series B in 2021
ClickHouse is an open-source, column-oriented database management system designed for online analytical processing. It enables real-time analytical reporting by executing SQL queries over large datasets. Its columnar storage reduces data footprint and speeds up query performance by eliminating unnecessary data, while vector-based processing enhances CPU efficiency for large-scale workloads. The system handles vast numbers of rows and gigabytes of data per server, delivering secure, reliable, and scalable analytics that help enterprises streamline data processing.

Modern Treasury

Series C in 2021
Modern Treasury Corp. is a technology company that specializes in payment operations software, aimed at simplifying and modernizing business payments. Founded in 2018 and headquartered in San Francisco, California, the company offers a platform that automates the complete lifecycle of payments. This includes processes such as payment initiation, approval, processing, and reconciliation, all accessible through a web application or API. By integrating bank statements with clients' financial logic, Modern Treasury provides a comprehensive view of financial transactions, allowing finance teams to focus on critical business challenges rather than manual reconciliation tasks. The platform serves various industries, including real estate, healthcare, financial services, and marketplaces, offering robust tools and real-time data access to enhance payment operations.

Modern Treasury

Series B in 2021
Modern Treasury Corp. is a technology company that specializes in payment operations software, aimed at simplifying and modernizing business payments. Founded in 2018 and headquartered in San Francisco, California, the company offers a platform that automates the complete lifecycle of payments. This includes processes such as payment initiation, approval, processing, and reconciliation, all accessible through a web application or API. By integrating bank statements with clients' financial logic, Modern Treasury provides a comprehensive view of financial transactions, allowing finance teams to focus on critical business challenges rather than manual reconciliation tasks. The platform serves various industries, including real estate, healthcare, financial services, and marketplaces, offering robust tools and real-time data access to enhance payment operations.

Confluent

Series E in 2020
Confluent is a data streaming platform company founded in 2014 and headquartered in Mountain View, California. It builds and offers a platform based on Apache Kafka that enables real‑time data integration, stream processing, and analytics for enterprises, government agencies, and the public sector. The company’s product suite includes Confluent Cloud, a fully managed streaming service; Confluent Platform, a self‑managed SaaS offering; Confluent Operator for Kubernetes; KSQL and ksqlDB for continuous SQL queries; and WarpStream for event‑driven architecture. Confluent generates revenue primarily through subscription fees and professional services. It operates globally with offices in the United States, Europe, and Australia.

LightStep

Series C in 2018
LightStep Inc., established in 2013 and based in San Francisco, specializes in application performance management (APM) software solutions. The company's flagship product, LightStepPM, monitors and manages the performance of production systems at scale, providing real-time insights into end-to-end system behavior and interactions across organizational boundaries. It offers features such as SAML support, flexible data scrubbing, and is built on open standards. LightStep aims to deliver confidence in software application management by analyzing 100% of unsampled transaction data, accelerating root cause analysis for complex systems.

Unity Technologies

Secondary Market in 2018
Unity Technologies specializes in providing multiplatform tools and services for developers of interactive content. Founded in 2004, they offer a comprehensive suite of products including game engines, asset stores, cloud-based development tools, empowering users to create, operate, and monetize real-time 3D experiences across various industries.
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