Sierra Raises $950 Million, Valued Above $15 Billion, Led by Tiger Global and GV

AI startup Sierra has raised $950 million in a funding round that values the company at more than $15 billion, with The Economic Times describing the valuation as “over $15 billion” and saying the company plans to use the funds to expand its platform.

“Skip to main content Axios Pro Exclusive Content Sierra locks up $950M at a $15”

Axios

TechCrunch similarly reports Sierra is raising a $950 million funding round “pushing its post-money valuation above $15 billion,” and says the raise gives Sierra “more than $1 billion to work with.”

Ecosistema Startup

Axios frames the same deal as “Sierra locks up $950M at a $15.8B valuation,” while mezha.net says the round led by Tiger Global and GV pushes Sierra’s post-money valuation “surpassed $15 billion.”

Multiple outlets tie the funding to Sierra’s agentic customer-service product, with The Economic Times saying Sierra develops “AI-powered customer service agents” and that its agents are “already powering billions of customer interactions.”

The Economic Times adds that Sierra’s enterprise customer base includes companies such as Prudential, Cigna, Blue Cross Blue Shield and Rocket Mortgage, and says Sierra is serving “over 40% of the Fortune 50.”

In a post on X, Bret Taylor wrote, “Now, Sierra is serving over 40% of the Fortune 50, and agents built on our platform are powering billions of customer interactions.”

The Economic Times also reports the company “surpassed $150 million in annual recurring revenue since its launch in February 2024,” and notes the latest round follows a prior raise of $350 million at a $10 billion valuation led by Greenoaks in September last year.

The funding round is tied to Sierra’s leadership and investor syndicate, with The Economic Times naming Bret Taylor as founder and chairman of the board of Sam Altman’s OpenAI and former co-CEO of Salesforce, and naming Clay Bavor as a former Google executive.

It says the round includes participation from existing investors such as Benchmark, Sequoia and Greenoaks, and describes the company as positioning itself “within a new class of software companies built on top of foundational models from AI startups such as OpenAI and Anthropic.”

La Tribune

The Economic Times also says Sierra claims its agents are “assembled using over 15 frontier, open-weight, and proprietary models,” and that Sierra’s enterprise customer base includes companies such as Prudential, Cigna, Blue Cross Blue Shield and Rocket Mortgage.

TechCrunch similarly reports that the raise is led by Tiger Global and GV, and says Sierra’s post-money valuation is above $15 billion, with the company using the money to become the “global standard” for AI-powered customer experiences.

mezha.net adds that the $950 million round is “led by Tiger Global and GV,” and says the deal unlocks “more than one billion dollars in resources for Sierra.”

The Economic Times provides a timeline for revenue growth, saying Sierra “surpassed $150 million in annual recurring revenue since its launch in February 2024,” and also reporting that the company raised $350 million in September last year at a $10 billion valuation.

TechCrunch describes a sequence of revenue posts, saying Sierra “first said it hit $100 million in annual recurring revenue in late November” and then “published another post in early February, saying it had hit $150 million in ARR.”

Across the coverage, Sierra’s product is described as agentic software that handles customer interactions end-to-end, and the reporting connects the funding to a broader push for enterprise deployment.

“After Sierra Leone, Trafigura strengthens its presence in African gold with a deal in Ghana”

La Tribune

The Economic Times says Sierra’s agents are “already powering billions of customer interactions,” and it lists examples including “refinancing homes to processing insurance claims, returning orders, and helping people raise millions in fundraisers.”

TechCrunch similarly says Sierra’s agents are handling “billions of interactions, from refinancing mortgages to processing insurance claims, managing returns, and powering nonprofit fundraising campaigns.”

The Economic Times also says Sierra is positioning itself within a class of software built on foundational models from AI startups such as OpenAI and Anthropic, and it says Sierra’s agents are assembled using “over 15 frontier, open-weight, and proprietary models.”

In a separate thread, TechCrunch describes Uber’s internal experience with agentic AI, saying Uber CTO Praveen Neppalli Naga told the editor that Uber “blew through our [AI] budget” soon after opening the door to agentic AI tools late last year and that the company is now starting to see meaningful results.

TechCrunch adds that Uber has “about 8,000 engineers and technical workers,” and says “about 10% of all code being produced at the company is now generated autonomously,” with Naga adding that “10% at our scale is huge.”

As a proof-of-concept, TechCrunch reports Uber tasked “one team” with building a “new hotel-booking integration using only agentic workflows,” and says “Work that would normally take a year was done in six months.”

Several outlets describe Sierra’s expansion beyond customer-facing agents, with TechCrunch and mezha.net both reporting the April launch of Ghostwriter, described as an “agent as a service” tool.

TechCrunch says Ghostwriter is designed to build other agents, and that “Users describe what they need in natural language,” while “Ghostwriter autonomously creates and deploys a specialized agent to handle it.”

mezha.net

mezha.net likewise says that in April the company launched Ghostwriter, an “agent as a service” tool that enables building other agents, and it adds that “Users describe their needs in natural language, and Ghostwriter autonomously creates and deploys a specialized agent to accomplish it.”

The Economic Times does not focus on Ghostwriter in its main body, but it does describe Sierra’s platform as built on foundational models and says the company aims to become a global standard for AI-driven customer experience.

In addition to Ghostwriter, the Spanish-language Ecosistema Startup coverage describes Sierra’s platform as “Agent OS,” saying it allows companies to create and personalize agents “con o sin codigo,” and it claims the platform maintains “consistencia de marca” and “precision en las respuestas.”

That same source says Sierra’s central thesis is that “la era de hacer clic en botones se acabo,” and it frames Sierra as founded by Bret Taylor and Clay Bavor, with the company described as launching in 2024.

While these claims are not repeated in the other outlets’ bodies, they align with the broader pattern of rapid ARR growth described by The Economic Times and TechCrunch, which both cite $100 million in late November and $150 million in early February.