Walden Catalyst Ventures
About Walden Catalyst Ventures
Walden Catalyst Ventures is an early-stage venture capital firm founded in 2021, focusing on the deep tech sector. The firm is led by industry pioneers Young Sohn and Lip-Bu Tan, who bring extensive experience in investing and operational support. Walden Catalyst Ventures aims to support visionary entrepreneurs developing breakthrough technologies in areas such as artificial intelligence, cloud computing, fintech, semiconductors, and digital biology.
The firm manages an inaugural fund of over $550 million and primarily invests in seed, Series A, and Series B funding rounds. It operates across Per Crunchbase, Walden Catalyst has made 38 investments, 19 as lead investor across 26 portfolio companies, with 6 exits.
The firm announced the close of its first fund on November 1, 2021, with Lip-Bu Tan and Young Sohn leading it. The two had co-invested and sat on each other's boards for about 15 years before that. Tan founded Walden International and has been CEO of Cadence Design Systems. TechCrunch's April 2026 coverage of NeoCognition calls him Intel's CEO. Sohn was previously Corporate President and Chief Strategy Officer of Samsung Electronics. Five more partners were introduced at launch: Shankar Chandran, Roni Hefetz, Francis Ho, Andrew Kau and Nicolas Autret. The firm does not publicly assign individual partners to AI. It describes its focus as data and AI across the U.S., Europe and Israel.
The firm has framed its thesis around data and AI since launch. Its early deals included AI21 Labs, MindsDB and Speedata. It has since backed AI agents, confidential AI, AI evaluation and AI infrastructure companies. It often co-invests with other funds, and it has led or co-led rounds at Opaque, Ati Motors and NeoCognition. In 2026 it took part in three AI seed rounds: NeoCognition ($40M, co-led with Cambium Capital), Nace.AI ($21.5M) and RadixArk ($100M).
The firm describes itself as early stage. Tracxn counts its entry rounds as 10 seed, 9 Series A, 4 Series B, 2 Series C and 1 Series D. The firm has not published a check size or ownership target. Third-party estimates differ widely, so none are given here. PitchBook lists the first fund at $601M, against the over $550M announced at close. It also lists GIC, SoftBank and Temasek as limited partners.
- NeoCognition: research lab building self-learning AI agents. $40M seed in April 2026, co-led with Cambium Capital.
- Nace.AI: $21.5M seed in 2026, with General Catalyst listed as a co-investor.
- RadixArk: $100M seed in 2026, with Accel listed as a co-investor.
- Opaque: confidential AI for enterprises. $24M Series B in February 2026, led by Walden Catalyst.
- Ati Motors: AI and autonomous robotics for industrial use. $20M Series B in January 2025, led with NGP Capital.
- AI21 Labs: language model company. Walden Catalyst invested in 2022 per PitchBook.
- Voltron Data: data analytics software. Series A in January 2022 per PitchBook.
- Galileo: AI evaluation software. Invested in 2022 per PitchBook.
- businesswire.com/news/home/20211101005503/en/Walden-Catalyst-Ventures-
- waldencatalyst.com/blog/firm-news-over-usd550m-for-deep-tech-startups
- app.dealroom.co/news/note/walden-catalyst-ventures-over-550m-for-deep-
- pitchbook.com/profiles/fund/18343-27F
- pitchbook.com/profiles/investor/460280-44
- tracxn.com/d/venture-capital/walden-catalyst/**jb4A9XZYVGT1uHs6AUkqLZu
- techcrunch.com/2026/04/21/ai-research-lab-neocognition-lands-40m-seed-
- parsers.vc/fund/waldencatalyst.com
Investing activity
Walden Catalyst Ventures appears in 4 AI deals tracked by the AI Lounge deals desk, rounds totalling $183M, and led 3 of them. The rounds are mostly Seed, with a median round size of $40M and the largest at $100M. The most recent are Nace.AI (Seed, $21.5M, May 2026), Nace.AI (Seed, $21.5M, May 2026) and NeoCognition (Seed, $40M, Apr 2026).
Walden Catalyst Ventures most often invests alongside General Catalyst, Lip-Bu Tan, Cambium Capital Partners and Cambium Capital, and the companies it backs on AI Lounge are mostly in AI and AI Infrastructure.
Deals
Frequently asked questions about Walden Catalyst Ventures
Who runs Walden Catalyst Ventures?
Young Sohn and Lip-Bu Tan are the founding managing partners. The other partners are Shankar Chandran, Roni Hefetz, Francis Ho, Andrew Kau and Nicolas Autret.
How big is Walden Catalyst's fund?
The firm announced a first fund of over $550 million in November 2021, above its $400 million target. PitchBook lists the fund at $601M.
What AI startups has Walden Catalyst invested in?
They include NeoCognition, Nace.AI, RadixArk, Opaque, Ati Motors, AI21 Labs, Voltron Data and Galileo. The firm has led or co-led rounds at Opaque, Ati Motors and NeoCognition.
What check size does Walden Catalyst write?
The firm has not published a check size. Third-party estimates vary too much to rely on, so ask about size when you pitch.
Does Walden Catalyst invest outside the United States?
Yes. Its launch announcement names the U.S., Europe and Israel as its focus. Its portfolio includes Ati Motors in India and Speedata in Israel.
What AI companies has Walden Catalyst Ventures invested in?
Walden Catalyst Ventures's AI investments include Nace.AI, NeoCognition and RadixArk. The 4 rounds on AI Lounge are listed on this page with amounts, dates and co-investors.
Where is Walden Catalyst Ventures based?
Walden Catalyst Ventures is based in San Francisco, California, United States.
What stage does Walden Catalyst Ventures invest at?
In the rounds tracked on AI Lounge, Walden Catalyst Ventures has invested at Seed, with a median round of $40M. Walden Catalyst Ventures led 3 of those rounds.
Who does Walden Catalyst Ventures co-invest with?
Walden Catalyst Ventures's most frequent co-investors on AI Lounge are General Catalyst (2 deals), Lip-Bu Tan (2 deals), Cambium Capital Partners (1 deal), Cambium Capital (1 deal) and Dawn Song (1 deal).
How can founders reach Walden Catalyst Ventures?
Founders on AI Lounge can see Walden Catalyst Ventures's contact details in AI Investor Contacts (paid plans), check for a warm introduction through members who worked with the firm under Warm Paths, and add Walden Catalyst Ventures to their Investor Pipeline to track the conversation.