Chronosphere's data-cost observability bet ended in a $3.35B Palo Alto buyout

Chronosphere sells a cloud-native observability platform built around M3, the open-source metrics engine its founders created at Uber; it ingests metrics, traces and logs at large scale while pruning redundant telemetry so engineering teams can monitor thousands of microservices without drowning in data or cost.

That whoever controlled telemetry volume and cost would win observability: ingest at scale, cut what does not matter, and make the surviving signals affordable.

$369M across four rounds, including an $11M Series A led by Greylock (2019), $43.3M (January 2021), $200M (October 2021) and $115M (January 2023); the acquisition price was $3.35B in cash and replacement equity awards.

Martin Mao and Rob Skillington met at Uber, where they built and open-sourced M3 because no commercial or open-source monitoring tool could handle Uber's scale of containers and microservices. When the M3 community began asking for enterprise features that Uber did not need, the two left with Uber's blessing and launched Chronosphere in 2019 with an $11M Series A led by Greylock, planning a managed cloud version of M3 that took away the operational burden of running the complex system.

Chronosphere raised steadily as the bet matured: $43.3M in January 2021, $200M in October 2021 and $115M in January 2023, for $369M total. Its platform — built to ingest huge volumes of metrics, traces and logs, then reduce non-actionable data — found its customers among organizations running thousands of microservices and large container fleets. By September 2025 Palo Alto Networks cited ARR above $160M with triple-digit growth, and CEO Mao had described the platform's data-control approach as redefining cloud-native observability.

On 2025-11-19 Palo Alto Networks announced it would acquire Chronosphere for $3.35B in cash and replacement equity, calling it a next-generation observability platform for the AI era; the acquisition was completed by early February 2026, with Chronosphere to keep running independently while its platform integrates with Palo Alto Networks' Cortex AgentiX agent platform.

The founders had proof before the company existed: M3 ran one of the world's largest production monitoring systems at Uber, demonstrating the scale problem and a working answer to it.

Cost, not features, was the unmet need: enterprises were drowning in telemetry bills, so a platform that cut what you ingest and store had a measurable ROI story that dashboards could not match.

The funding path validated the thesis long before the exit — $369M across four rounds from serious investors, including Greylock from day one.

The buyer made strategic sense: Palo Alto Networks needed real-time observability to make its AI agents autonomous, and Chronosphere's data layer was the missing piece of a larger platform bet.

When a market's problem is cost, sell cost control: Chronosphere made unaffordable telemetry its wedge, then let a security giant pay $3.35B to own the data layer under its AI agents.

As of 2026-09-06 Chronosphere operates inside Palo Alto Networks. The $3.35B acquisition, announced on 2025-11-19 and completed by early February 2026, keeps the company running independently while its platform integrates with Cortex AgentiX for agentic security operations. It was part of a consolidation wave: Palo Alto Networks closed its $25B CyberArk deal in 2025 and bought several startups in 2026, including Console in September. For Mao and Skillington, the arc ran from an open-source project Uber blessed, through $369M raised independently, to a $3.35B strategic exit.