LangChain funding: Every round, investor, and valuation (2026)

LangChain makes software for building AI agents, programs that use a large language model to reason, call tools, and take actions. Its open-source frameworks, LangChain and LangGraph, are free. The company makes money from LangSmith, a paid platform that lets teams trace, test, and deploy those agents once they reach production.

LangChain has raised about $160 million across three rounds since 2023, all of it equity. Its last announced round, a $125 million Series B led by IVP in October 2025, made it a unicorn.

The cap table reads like a list of the companies that sit around an AI agent: Alphabet's growth fund, workplace software makers, a networking giant, and two data platforms. Several are also customers. Let's dive into LangChain's funding history.

LangChain has raised three times in about two and a half years. Each round paid for a step away from the free framework and toward a product companies buy.

Harrison Chase published the first version of LangChain in October 2022, weeks before OpenAI released ChatGPT. He was then an engineer at Robust Intelligence, an AI security startup. The library let developers connect a language model to search engines, databases, and APIs in a sequence of steps, or "chains," which the models of the day could not do on their own.

Developers adopted it fast, and Chase turned the project into a company with co-founder Ankush Gola. Benchmark led a $10 million seed round announced in April 2023. In its announcement, LangChain pointed to Benchmark's record as the first lead investor in open-source companies such as Docker, Confluent, and Elastic.

Nine days later, Business Insider reported that Sequoia was leading a new round at a valuation of at least $200 million. LangChain announced a $25 million Series A led by Sequoia in February 2024, timed to the general release of LangSmith. Sequoia partner Sonya Huang led the deal.

LangSmith was the first product LangChain could charge for. By the time it became generally available, it had more than 80,000 signups and more than 5,000 teams using it every month.

TechCrunch reported in July 2025 that LangChain was raising at a valuation of about $1 billion, with IVP in the lead. Forbes reported the same week that a $100 million round had closed at $1.1 billion. Some funding databases count that report as a separate round, which is why they put LangChain's total at about $260 million. It was the same financing, and LangChain did not confirm it until October.

The final round came to $125 million at a $1.25 billion valuation. IVP led, and Sequoia, Benchmark, and Amplify Partners returned. CapitalG and Sapphire Ventures were the new institutional investors.

A third group came from the corporate venture arms of ServiceNow, Workday, Cisco, Datadog, and Databricks, plus the fund Frontline. LangChain thanked them in its announcement as investors "many of whom are already customers or partners."

The company paired the money with a product overhaul. It shipped version 1.0 of both open-source frameworks, renamed its hosting product LangSmith Deployment, and previewed a no-code agent builder for business users.

LangChain has announced only one valuation of its own: $1.25 billion in October 2025. The earlier figure comes from press reports, and the most recent one from a private-market data provider.

The valuation rose about six times in the 20 months between the Series A and the Series B, far faster than revenue. TechCrunch's sources put LangChain's annual recurring revenue at $12 million to $16 million in mid-2025, so the Series B priced the company at roughly 80 to 100 times sales. LangChain told Fortune that range was "low for where we are today" but gave no figure of its own.

What investors bought was reach. In October 2025, LangChain said its two frameworks had 90 million downloads a month and that 35% of Fortune 500 companies used its products. The bet is that a share of that audience moves onto the paid platform.

Forge Global, a marketplace for private company shares, now lists a Series C valuation of $3.01 billion dated September 2026, based on company filings it collects. LangChain has not announced a Series C, and the amount raised is not public, so this article leaves it out of the funding total.

LangChain's investors fall into three groups: the venture firms that backed the open-source project early, the growth funds that led or joined the Series B, and the corporate investors that build on its software.

IVP, a growth-stage firm in Menlo Park, led the Series B. General partner Tom Loverro told Fortune the firm had "high conviction" in the founders from the start. He compared LangChain's potential to CrowdStrike and Datadog, two companies that became standard tools for managing complex infrastructure.

Benchmark wrote the first institutional check and Sequoia led the next one. Both returned for the Series B, which kept the two earliest backers on the cap table through the move into paid software.

Amplify Partners, an early-stage firm focused on developer tools, also invested again in the Series B.

CapitalG is the growth fund of Alphabet, whose founders still control Google's parent. Its investment puts a Google-backed fund behind a framework that works with every major model provider, including Google's own Gemini.

Sapphire Ventures, which began as the venture arm of SAP, focuses on enterprise software. It joined as a new investor in the Series B.

The corporate group matters most for distribution. Workday and Cisco are named LangSmith customers, and Fortune reported that ServiceNow builds on LangChain as well. A stake gives each one a say in, and an early view of, the tools their own AI agents run on.

Databricks and Datadog sell data and monitoring platforms that sit next to LangSmith in a company's software stack. Databricks is a heavy fundraiser in its own right, with its own multibillion-dollar rounds far larger than anything LangChain has raised.

No investor's stake has been disclosed, and neither has the makeup of LangChain's board.

LangChain spends its funding on engineers and on turning LangSmith into a full platform. The company is not profitable, but a spokesperson told Fortune it is "fairly efficient in spend" compared with other venture-backed startups.

The open-source frameworks are free under the MIT license and earn nothing directly. Revenue comes from LangSmith, which has a free tier for one developer and a Plus plan at $39 per seat per month. Teams pay more as they log more agent traces, run hosted deployments, and buy enterprise contracts with self-hosting. Customers named by the company include Replit, Clay, Harvey, Rippling, Cloudflare, and Workday. Replit, which has raised far more than LangChain in its own funding rounds, built its coding agent on LangGraph and monitors it with LangSmith.

Most of the money since the Series B has gone into new paid products. In 2026, LangChain launched LangSmith Fleet for building agents without code, made code sandboxes generally available, and released a managed version of its Deep Agents framework and an LLM gateway in beta. In September, it added fine-tuning to LangSmith, so customers can train models on their own agent data.

Headcount has grown with it. Data providers estimate about 150 employees around the Series B and about 200 by mid-2026, though LangChain does not publish a number. It has offices in San Francisco, New York, Boston, and Amsterdam, and it has not announced any acquisitions.

LangChain's growth focus is large companies moving agents from pilots into production. The Series B money is paying for the platform pieces those buyers ask for, from access controls and audit logs to deployment on a customer's own cloud account. The company now runs its Interrupt conference in San Francisco, New York, and London to reach them.

The biggest risk is that the model makers absorb LangChain's job. OpenAI ships its own Agents SDK, and Anthropic and Google offer built-in tools for agents, so the features that set LangChain apart are now bundled with OpenAI's per-token API business and how Anthropic sells Claude. In monitoring and testing, rivals include Braintrust and Langfuse, an open-source rival that the database company ClickHouse acquired in January 2026. Chase told Fortune that LangChain has "500 competitors and zero competitors at the same time," and is betting that a neutral platform wins when companies use several models at once.

LangChain has not announced a new round since October 2025 or any plans for an IPO. If the Series C that Forge lists is confirmed, it would more than double the company's valuation in under a year, at a time when AI companies take the largest share of startup funding. The next test is whether LangSmith revenue grows into that price.

LangChain has raised about $160 million across three announced rounds: a $10 million seed in April 2023, a $25 million Series A in February 2024, and a $125 million Series B in October 2025. The company has not reported any debt. A Series C dated September 2026 appears in Forge Global's data, but its amount is not public.

LangChain's lead investors are IVP, Sequoia Capital, and Benchmark. Other backers include Amplify Partners, CapitalG, Sapphire Ventures, ServiceNow Ventures, Workday Ventures, Cisco Investments, Datadog Ventures, Databricks Ventures, and Frontline.

LangChain was valued at $1.25 billion after its Series B in October 2025, the last valuation the company announced. Forge Global lists a Series C valuation of about $3 billion from September 2026, which LangChain has not confirmed.

No. LangChain is private and has not filed for an IPO. Its shares are not traded on any stock exchange, though some trade on private secondary markets.

LangChain is owned by its founders, employees, and venture investors. Co-founders Harrison Chase, the CEO, and Ankush Gola still run the company. The largest outside holders are likely the funds that led its rounds, IVP, Sequoia, and Benchmark, though exact stakes are not public.