About Walden Catalyst
Walden Catalyst is a venture capital firm founded in 2021. It is primarily based out of San Francisco, United States. As of Jun 2026, Walden Catalyst is an active investor, having invested in 25 companies, with 7 new investments in the last 12 months. It primarily invests in Series A round in United States based startups. Its investments are spread across a wide range of sectors from Enterprise Applications to High Tech and HealthTech. Most recently it participated in the $***** Series D round of Nearfield Instruments Overall, Walden Catalyst portfolio has seen 1 unicorn and 5 acquisitions including key companies like AI21 Labs, Galileo AI and Virtue AI. A lot of funds co-invest with Walden Catalyst, with names like A&E Investments sharing a substantial percentage of its portfolio. Walden Catalyst has team of 9 people including 8 partners.Key Metrics
Team Members
Portfolio Sectors
Portfolio Locations
Rounds of Entry
Seed, Series A & 3 more
Portfolio Unicorns
Deals in last 12 months
Walden Catalyst's List of Top Investments
Walden Catalyst has a portfolio of 25 companies, one of which is a Unicorn. Their most notable investments are in Ingonyama and MindsDB.Their portfolio spans across United States, Israel, India and 4 more locations. They have invested in Enterprise Applications, High Tech, HealthTech and 10 other sectors, across stages such as Seed, Series A and 3 more. Here is the list of top investments by Walden Catalyst:
1. Artera
AI-derived prognostic biomarker test for cancer detection. The company offers an AI-enabled test called the ArteraAI prostate test, which provides predictive and prognostic results for patients with localized prostate cancer. The test analyzes multiple characteristics of the individual patient, empowering doctors with personalized data for treatment planning.
Key facts about Artera
- Founded Year: 2021
- Location: Menlo Park (United States)
- Stage: Series A
- Total Funding till date: $135M
- Employee Count: 149 as on Jul 31, 2026
- Investors: Yali Capital, Walden Catalyst and 23 Others
- Latest Funding Round: Series A, Feb 01, 2024, $*****
- Highlight: Editors' Pick
2. AI21 Labs
Platform offering AI focused writing and reading assistants. It provides users with AI systems with a high capacity to understand and generate natural language. Its product WordTune also uses AI to give suggestions for rewriting texts.
Key facts about AI21 Labs
3. ANYbotics
Developer of multi-legged robots for asset inspections. Their robots are capable of conducting robotic inspections automatically to support plant monitoring and maintenance. It serves a variety of industries, including mining, steel, chemicals, oil and gas, and power.
Key facts about ANYbotics
- Founded Year: 2016
- Location: Zurich (Switzerland)
- Stage: Series B
- Total Funding till date: $150M
- Employee Count: 259 as on Jul 31, 2026
- Investors: Qualcomm Ventures, ACE & Company and 17 Others
- Latest Funding Round: Series B, Sep 22, 2025, $*****
- Highlight: Editors' Pick
4. Galileo AI
Provider of an AI observability and evaluation platform for agent reliability. It offers automated evaluations, rapid iteration, and real-time protection. The platform provides metrics for accuracy, safety, and performance. It helps identify failure modes and root causes. The platform delivers insights and prescribes fixes. It supports various deployment options.
Key facts about Galileo AI
- Founded Year: 2021
- Location: Burlingame (United States)
- Stage: Acquired
- Total Funding till date: $68M
- Employee Count: 124 as on Jul 31, 2026
- Investors: Premji Invest, ServiceNow and 11 Others
- Latest Funding Round: Series B, Oct 15, 2024, $*****
- Highlight: Acquired
5. Virtue AI
Provider of AI security and compliance platform. This platform offers real-time safeguards and continuous risk discovery for AI models, applications, and agents. It includes a multi-modal guardrail suite for various data types, enabling policy-compliant operation. The platform also provides continuous model and application benchmarking for security and regulatory compliance. It supports the secure development and deployment of AI systems across the entire AI stack.
Key facts about Virtue AI
- Founded Year: 2014
- Location: San Francisco (United States)
- Stage: Acquired
- Total Funding till date: $30M
- Employee Count: 33 as on Jul 31, 2026
- Investors: Walden Catalyst, FactoryHQ and 6 Others
- Latest Funding Round: Series A, Apr 15, 2025, $*****
- Highlight: Acquired
Walden Catalyst's Year-on-Year Investment Trends
Walden Catalyst has invested in 25 companies over the last 5 years, with an average of 5 new investments annually in the last 5 years. In 2025, it made 6 investments, while as of Jun 2026, it has made 6 investments in this year. Its most recent first time investment was in NaceAI and most recent follow-on round was in Nearfield Instruments.Year | No. of Investments | ||
|---|---|---|---|
1st Round | Follow-on | Total | |
2026 (YTD) | 4 | 2 | 6 |
2025 | 4 | 2 | 6 |
2024 | 5 | 3 | 8 |
2023 | 4 | 2 | 6 |
2022 | 4 | 2 | 6 |
2021 | 4 | 0 | 4 |
Walden Catalyst's Investments by Stage
Walden Catalyst has made 10 investments in Seed stage with an average round size of $36.6M, 9 investments in Series A stage with an average round size of $70M, 3 investments in Series B stage with an average round size of $38.3M, 2 investments in Series C stage with an average round size of $88.7M and 1 investment in Series D stage with an average round size of $140M.Stage of entry | No. of Investments |
|---|---|
Seed | 10 |
Series A | 9 |
Series B | 3 |
Series C | 2 |
Series D | 1 |
Note: We have considered here, only first round of investments
Walden Catalyst's Investments by Sector
Walden Catalyst has a diverse portfolio, with companies operating in the Enterprise Applications, High Tech, Semiconductors, Artificial Intelligence - Industry Applications and Enterprise Infrastructure. Notably, it has invested in 22 Tech companies, 21 Enterprise (B2B) companies, 15 Software companies and at least 11 companies focusing on AI-Native.Sector | No. of Investments |
|---|---|
Enterprise Applications | 14 |
High Tech | 11 |
Semiconductors | 5 |
Artificial Intelligence - Industry Applications | 4 |
Enterprise Infrastructure | 4 |
Others | 14 |
Note: We have considered here, only first round of investments
Walden Catalyst's Investments by Geography
Walden Catalyst has made most investments in United States (14), followed by Israel where it has made 4 investments.Country | No. of Investments |
|---|---|
United States | 14 |
Israel | 4 |
India | 2 |
Netherlands | 2 |
China | 1 |
Others | 2 |
Note: We have considered here, only first round of investments
Walden Catalyst's recent investments
Walden Catalyst has made 6 investments in 2026 so far. Nearfield Instruments and NaceAI are the latest among them.Here are the most recent investments by Walden Catalyst:
Filter this listDate | Company | Location | Round Details | Round Amount | Co-Investors |
|---|---|---|---|---|---|
Jun 22, 2026 | Netherlands | Series D | 1319 | [+7] | |
May 05, 2026 | United States | Seed | 5268 | ||
May 05, 2026 | United States | Seed | 7441 | [+8] | |
Apr 22, 2026 | United States | Seed | 1593 | ||
Feb 12, 2026 | United States | Series B | 1399 | [+4] |
Unicorns in Walden Catalyst's Portfolio
Walden Catalyst has 1 unicorn in its portfolio - AI21 Labs. The most recent unicorn in their portfolio is AI21 Labs which became a unicorn in 2023, 1 years after Walden Catalyst first invested in it.Here is a list of unicorns in Walden Catalyst's portfolio:
Tracxn Score | Company | Short Description | Founded year | Sector | Location | Company Stage | First Investment/ Acquisition Details |
|---|---|---|---|---|---|---|---|
66 | Platform offering AI focused writing and reading assistants | 2017 | Tel Aviv | Series D | bzqpezw |
Acquired companies in Walden Catalyst's Portfolio
5 companies from Walden Catalyst's portfolio have been acquired. The most recent acquisition was Virtue AI in Aug 2026 by Fortinet for $*****.Here are Walden Catalyst's portfolio companies that got acquired most recently:
Company | Acquisition Date | First Invested on | First Round of Investment | Round Size |
|---|---|---|---|---|
Aug 17, 2026 | Apr 15, 2025 | Seed | 1614 | |
Aug 04, 2026 | Feb 16, 2024 | Seed | 6429 | |
May 20, 2026 | Sep 22, 2025 | Series D | 5209 | |
Apr 09, 2026 | Oct 15, 2024 | Series B | 2129 | |
Oct 01, 2025 | Apr 16, 2024 | Series A | 2855 |
Team profile of Walden Catalyst
Walden Catalyst has a team of 9 members including 8 Partners and 1 Principal located in United States, France and 2 more locations. Walden Catalyst's team sits on the board of 4 companies.Here is a list of all team members in Walden Catalyst:
Name | Designation | Location | Board Memberships | Contact Details |
|---|---|---|---|---|
Partner | Paris | - | ||
Partner | Paris | - | ||
Partner | Israel | - | ||
Partner | San Francisco | - | ||
Partner | San Francisco | - | ||
Partner | Palo Alto | - | ||
Partner | Palo Alto | - | ||
Partner | - | - | ||
Principal | Berlin | - |
Co-investors of Walden Catalyst
Over the past 5 years, 210 investors have co-invested in Walden Catalyst's portfolio companies. This includes funds and angels.
- Invested before Walden Catalyst: Intel Capital, Pitango and 59 others have invested in rounds before Walden Catalyst. There are 2 companies where Intel Capital has invested before Walden Catalyst and 1 company where Pitango has invested before Walden Catalyst.
- Top Co-investors of Walden Catalyst: 111 investors entered a company along with Walden Catalyst. These include investors like A&E Investments (4 companies).
- Invested after Walden Catalyst: A total of 38 investors have invested in Walden Catalyst's portfolio after their investments. Top Investors include Prosperity7 Ventures (1 company), EDBI (1 company) and Wilson Sonsini Goodrich & Rosati (1 company).
Recent News related to Walden Catalyst
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Opaque raises $24M at $300M valuation for ‘confidential AI’ platformSiliconAngle•Feb 12, 2026•Walden Catalyst, , Atrc, Opaque and 4 others
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Amperesand Raises $80M Series A Co-led by Walden Catalyst Ventures and Temasek to Redefine Power Infrastructure for AI Data CentersBakersfield•Nov 18, 2025•Amperesand, Walden Catalyst, Temasek, TDK Ventures and 5 others
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Swiss robotics developer ANYbotics raises over €127 million for its four-legged workforceEU-Startups•Sep 22, 2025•Aramco Ventures, Walden Catalyst, Supernova Invest, Tdk and 5 others
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Nvidia And Google Back AI21 Labs In $300M Series D To Build Proprietary LLMs, Challenging OpenAI And Anthropic In Enterprise AIBenzinga•May 20, 2025•AI21 Labs, Nvidia, Google, Intel Capital and 4 others
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AI21 Labs raises $300M from Google and Nvidia to expand enterprise AI offerings
SiliconAngle•May 11, 2025•AI21 Labs, Google, Nvidia, Intel Capital and 7 others
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Nvidia-backed Israeli AI startup AI21 raises $300M in fundingDnyuz•May 09, 2025•AI21 Labs, Google, Nvidia, Intel Capital and 7 others
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Virtue AI Secures $30 Million in Funding for AI Safety ToolsSiliconAngle•Apr 16, 2025•Lightspeed Venture Partners, Walden Catalyst, Virtue AI
