The 15 Largest US Funding Rounds of August 2026

Looking at the largest US startup funding rounds from September 2026, leveraging data from CrunchBase, we’ve analyzed the most significant venture capital deals of the month. Beyond the raw funding numbers, this month’s analysis includes detailed information about each company’s industry focus, founding team, business model, and total funding history to provide deeper context about these high-growth ventures.

15. Gatik $200.0M

Round: Series D
Description: Santa Clara-based Gatik develops autonomous trucking technology and provides driverless middle-mile logistics services for businesses. Founded by Apeksha Kumavat, Arjun Narang, and Gautam Narang in 2012, Gatik has now raised a total of $504.7M in total equity funding and is backed by Alumni Ventures, ARK Investment Management, Millennium Management, Fontinalis Partners, and Dynamo.
Investors in the round: Alumni Ventures, ARK Investment Management, Intact Private Capital, Koch Disruptive Technologies, Millennium Management, Qatar Investment Authority
Industry: Artificial Intelligence (AI), Automotive, Autonomous Vehicles, Freight Service
Founders: Apeksha Kumavat, Arjun Narang, Gautam Narang
Founding year: 2012
Total equity funding raised: $504.7M

15. Generalist AI $200.0M

Round: Series B
Description: San Mateo-based Generalist AI develops AI and robotics technologies focused on enabling robots to perform physical tasks in real-world environments. Founded by Andrew Barry, Andy Zeng, and Pete Florence in 2019, Generalist AI has now raised a total of $753M in total equity funding and is backed by NVIDIA, Norwest, Radical Ventures, 8VC, and Spark Capital.
Investors in the round: 8VC, Bezos Expeditions, Fei-Fei Li, Hanabi Capital, NVIDIA, Radical Ventures, Spark Capital, Union Square Ventures
Industry: Artificial Intelligence (AI), Generative AI, Robotics
Founders: Andrew Barry, Andy Zeng, Pete Florence
Founding year: 2019
Total equity funding raised: $753.0M

15. Sonablate $200.0M

Round: Venture
Description: Charlotte-based Sonablate uses their device to treat a variety of urological indications by utilizing HIFU technologies. Founded in 1999, Sonablate has now raised a total of $205M in total equity funding and is backed by Eleven Ventures and MMV Capital Partners.
Investors in the round: Eleven Ventures
Industry: Health Care, Medical Device
Founding year: 1999
Total equity funding raised: $205.0M

14. Owner $240.0M

Round: Series D
Description: Palo Alto-based Owner is a technology company that provides tools for local restaurant owners to enhance sales and online presence. Founded by Adam Guild and Dean Bloembergen in 2013, Owner has now raised a total of $422.2M in total equity funding and is backed by Headline, Y Combinator, Transpose Platform Management, Mischief, and Redpoint.
Investors in the round: Goldman Sachs Asset Management, Headline, Jack Altman, Meritech Capital Partners, Redpoint
Industry: Artificial Intelligence (AI), Restaurants, SaaS, Software
Founders: Adam Guild, Dean Bloembergen
Founding year: 2013
Total equity funding raised: $422.2M

13. Starcloud $250.0M

Round: Series A
Description: Redmond-based Starcloud develops space-based data center infrastructure designed to support computing and data processing beyond Earth environments. Founded by Adi Oltean, Ezra Feilden, and Philip Johnston in 2019, Starcloud has now raised a total of $443.9M in total equity funding and is backed by Andreessen Horowitz, NVIDIA, Plug and Play, Sequoia Capital, and EQT.
Investors in the round: Benchmark, Cedar Capital, Cisco Investments, EQT, Goanna Capital, Manhattan West, NFX, NVIDIA, Pari Passu Venture Partners, Seven Seven Six, Soma Capital, Standard Capital
Industry: Aerospace, AI Infrastructure, Cloud Computing, Cloud Infrastructure, Data Center, Manufacturing, Space Travel
Founders: Adi Oltean, Ezra Feilden, Philip Johnston
Founding year: 2019
Total equity funding raised: $443.9M

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13. Neros Technologies $250.0M

Round: Series C
Description: Los Angeles-based Neros Technologies is a defense technology company specializing in the development and manufacturing of advanced unmanned aerial systems. Founded by Olaf Hichwa and Soren Monroe-Anderson in 2018, Neros Technologies has now raised a total of $369.5M in total equity funding and is backed by Valor Equity Partners, Sequoia Capital, Spark Capital, BoxGroup, and Fundomo.
Investors in the round: Allen & Company, American Strategic Technology Fund, Dylan Field, Interlagos Capital, MANTIS Venture Capital, Sequoia Capital, Spark Capital, Thiel Capital, Valor Equity Partners
Industry: Aerospace, Drones, Robotics, Software
Founders: Olaf Hichwa, Soren Monroe-Anderson
Founding year: 2018
Total equity funding raised: $369.5M

13. Muon Space $250.0M

Round: Series C
Description: Mountain View-based Muon Space designs, builds, and operates satellite constellations for national security, civil, and commercial applications. Founded by Dan McCleese, Jonathan Dyer, Pascal Stang, Paul Day, and Reuben Rohrschneider in 2016, Muon Space has now raised a total of $386.2M in total equity funding and is backed by Wellington Management, Radical Ventures, Eclipse, I Squared Capital, and South Park Commons.
Investors in the round: ACME Capital, Activate Capital Partners, ArcTern Ventures, Congruent Ventures, Costanoa Ventures, Eclipse, Galvanize Climate Solutions, Google, I Squared Capital, Overlap Holdings, Radical Ventures, Salesforce Ventures, Wellington Management, Woven Capital
Industry: Aerospace, Information Services, Information Technology
Founders: Dan McCleese, Jonathan Dyer, Pascal Stang, Paul Day, Reuben Rohrschneider
Founding year: 2016
Total equity funding raised: $386.2M

13. Instinct $250.0M

Round: Series B
Description: San Francisco-based Instinct is an artificial intelligence startup developing AI technology. Founded by Noah Shinn in 2021, Instinct has now raised a total of $325M in total equity funding and is backed by Index Ventures, Benchmark, Kleiner Perkins, Scott Belsky, and Neil Mehta.
Investors in the round: Benchmark, Index Ventures
Industry: Artificial Intelligence (AI)
Founders: Noah Shinn
Founding year: 2021
Total equity funding raised: $325.0M

13. Horizon3.ai $250.0M

Round: Series E
Description: San Francisco-based Horizon3.ai offers an autonomous penetration testing platform that helps organizations proactively find and fix security vulnerabilities. Founded by Anthony Pillitiere and Snehal Antani in 2015, Horizon3.ai has now raised a total of $428.5M in total equity funding and is backed by Craft Ventures, New Enterprise Associates, Sapphire Ventures, SignalFire, and PSG Equity.
Investors in the round: Acrew Capital, Blue Cloud Ventures, Craft Ventures, Demeter, EDBI, New Enterprise Associates, NightDragon, Prosperity7 Ventures, PSG Equity, Qualcomm Ventures, Ridge Ventures, SAIC, Sapphire Ventures, SignalFire
Industry: Artificial Intelligence (AI), Cyber Security, Enterprise Software, Machine Learning, Network Security
Founders: Anthony Pillitiere, Snehal Antani
Founding year: 2015
Total equity funding raised: $428.5M

12. Wispr Flow $280.0M

Round: Series B
Description: San Francisco-based Wispr Flow provides AI-powered voice dictation and voice interaction tools for voice-based writing and meeting transcription. Founded by Sahaj Garg and Tanay Kothari in 2017, Wispr Flow has now raised a total of $361.6M in total equity funding and is backed by Menlo Ventures, Alumni Ventures, 8VC, Neo, and Peak XV Partners.
Investors in the round: 8VC, Aaron Gordon, Acrew Capital, Activate, Alex Caruso, Dak Prescott, DK Metcalf, Domantas Sabonis, Forerunner, Goodwater Capital, Joe Burrow, Klay Thompson, Kyle Hamilton, Livvy Dunne, Menlo Ventures, MVP Ventures, Neo, New Enterprise Associates, Notable Capital, Paul George, Peak XV Partners, Plus Capital, Shaun White, SignalRank, Together Fund, Trae Young
Industry: Apps, Artificial Intelligence (AI), Machine Learning, Productivity Tools, Software
Founders: Sahaj Garg, Tanay Kothari
Founding year: 2017
Total equity funding raised: $361.6M

11. Volta $300.0M

Round: Series A
Description: Palo Alto-based Volta is a vertically integrated AI infrastructure platform. Founded by Ricard Boada and Sofia Gumuzio in 2021, Volta has now raised a total of $300M in total equity funding and is backed by Andreessen Horowitz, NVIDIA, Altimeter Capital, Azora, and Matter Venture Partners.
Investors in the round: Altimeter Capital, Andreessen Horowitz, Azora, Matter Venture Partners, Michael Dell, NVIDIA
Industry: Information Technology, Infrastructure, Internet
Founders: Ricard Boada, Sofia Gumuzio
Founding year: 2021
Total equity funding raised: $300.0M

10. Mariana Minerals $310.0M

Round: Series B
Description: Houston-based Mariana Minerals develops mineral projects using technology to supply critical minerals for energy, AI, and defense applications. Founded by Baker Tilney, Juan Lozano, and Turner Caldwell in 2020, Mariana Minerals has now raised a total of $395M in total equity funding and is backed by Andreessen Horowitz, Khosla Ventures, Greenoaks, StepStone Group, and Greycroft.
Investors in the round: Andreessen Horowitz, BHP Ventures, Breakthrough Energy Ventures, Earthshot Ventures, General Innovation Capital Partners, Greenoaks, Greycroft, IQT, Khosla Ventures, Mitsubishi Hc Capital America Inc., Pax Ventures, StepStone Group, The Halo Fund, Washington Harbour Partners
Industry: Artificial Intelligence (AI), Mineral, Mining
Founders: Baker Tilney, Juan Lozano, Turner Caldwell
Founding year: 2020
Total equity funding raised: $395.0M

9. Groq $350.0M

Round: Series A
Description: San Jose-based Groq provides a platform and hardware infrastructure designed for AI inference workloads. Founded by Doug Wightman and Jonathan Ross in 2011, Groq has now raised a total of $2.8B in total equity funding and is backed by NVIDIA, Alumni Ventures, Plug and Play, BlackRock, and 1789 Capital.
Investors in the round: Disruptive, NVIDIA, Open Field Capital
Industry: AI Infrastructure, Artificial Intelligence (AI), Electronics, Machine Learning, Semiconductor
Founders: Doug Wightman, Jonathan Ross
Founding year: 2011
Total equity funding raised: $2.8B

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9. Atlantic Alumina $350.0M

Round: Venture
Description: Gramercy-based Atlantic Alumina is a manufacturing industry that offers aluminum products. Founded in 2010, Atlantic Alumina has now raised a total of $800M in total equity funding and is backed by U.S. Department of War and Pinnacle Asset Management.
Investors in the round: Pinnacle Asset Management, U.S. Department of War
Industry: Industrial, Industrial Engineering, Manufacturing
Founding year: 2010
Total equity funding raised: $800.0M

8. Higgsfield $400.0M

Round: Series B
Description: San Francisco-based Higgsfield provides AI-powered tools for creating and editing images and videos. Founded by Alex Mashrabov, Mahi De Silva, and Yerzat Dulat in 2021, Higgsfield has now raised a total of $538M in total equity funding and is backed by Menlo Ventures, Accel, Alumni Ventures, Tribe Capital, and Davidovs Venture Collective.
Investors in the round: Accel, AI Capital, BAM Corner Point, BroadLight Capital, Capra ventures, DST Global, Fifth Wall, GFT Ventures, Goldman Sachs, Intel, Liberty Global, Menlo Ventures, Mirae Asset Capital, Natalia Vodianova, NTT DOCOMO Ventures, Smash Ventures, Tribe Capital, Valor Capital Group
Industry: Artificial Intelligence (AI), Generative AI, Social Media, Video Editing
Founders: Alex Mashrabov, Mahi De Silva, Yerzat Dulat
Founding year: 2021
Total equity funding raised: $538.0M

8. Source Foundry $400.0M

Round: Venture
Description: San Francisco-based Source Foundry develops semiconductor manufacturing focused on chip fabrication for artificial intelligence infrastructure. Founded by Abdelmalek Abid and Joe Berg in 2020, Source Foundry has now raised a total of $700M in total equity funding and is backed by Sequoia Capital and Situational Awareness.
Investors in the round: Situational Awareness
Industry: Artificial Intelligence (AI), Manufacturing, Semiconductor
Founders: Abdelmalek Abid, Joe Berg
Founding year: 2020
Total equity funding raised: $700.0M

7. Oxide Computer Company $445.0M

Round: Series D
Description: Emeryville-based Oxide Computer Company delivers unified hardware and open source software for hyperscaler-class cloud computing on-premises. Founded by Bryan Cantrill, Jessie Frazelle, and Steve Tuck in 2015, Oxide Computer Company has now raised a total of $839M in total equity funding and is backed by Eclipse, Rally Ventures, Counterpart Ventures, US Innovative Technology Fund, and Friends & Family Capital.
Industry: Cloud Computing, Cloud Infrastructure, Cloud Storage, Embedded Systems, Hardware, Information Technology, Software
Founders: Bryan Cantrill, Jessie Frazelle, Steve Tuck
Founding year: 2015
Total equity funding raised: $839.0M

6. Whatnot $547.0M

Round: Series G
Description: Los Angeles-based Whatnot is a live shopping marketplace that connects buyers and sellers through interactive livestreams, auctions, and online storefronts. Founded by Grant LaFontaine and Logan Head in 2015, Whatnot has now raised a total of $1.5B in total equity funding and is backed by Andreessen Horowitz, Wellington Management, Sequoia Capital, Lightspeed Venture Partners, and S32.
Investors in the round: Alkeon Capital, Andreessen Horowitz, avra, Bond, CapitalG, DST Global, Durable Capital Partners, Greycroft, ICONIQ Capital, Kleiner Perkins, Lightspeed Venture Partners, Robinhood Ventures, S32, Standard Capital, Wellington Management, Y Combinator
Industry: Collectibles, Consumer, Consumer Applications, E-Commerce, Information Technology, Marketplace, Online Auctions, Trading Platform
Founders: Grant LaFontaine, Logan Head
Founding year: 2015
Total equity funding raised: $1.5B

5. Etched $700.0M

Round: Series D
Description: San Jose-based Etched is an AI chip startup that designs and manufactures hardware systems optimized for artificial intelligence model inference workloads. Founded by Chris Zhu, Gavin Uberti, and Robert Wachen in 2017, Etched has now raised a total of $1.6B in total equity funding and is backed by Andreessen Horowitz, Primary Venture Partners, Sequoia Capital, Neo, and Davidovs Venture Collective.
Investors in the round: Andreessen Horowitz, Argo, Bain Capital Ventures, Blackstone, Diffusion Capital Partners, Jane Street Capital, Kleiner Perkins, Neo, Peter Thiel, Positive Sum, Primary Venture Partners, Sequoia Capital, Stripes, Tiger Global Management
Industry: AI Infrastructure, Artificial Intelligence (AI), Computer, Hardware, Manufacturing, Semiconductor
Founders: Chris Zhu, Gavin Uberti, Robert Wachen
Founding year: 2017
Total equity funding raised: $1.6B

5. Lumilens $700.0M

Round: Series C
Description: San Jose-based Lumilens develops photonic interconnect solutions engineered for scaling artificial intelligence compute infrastructure. Founded by Ankur Singla, David Friedman, Ritesh Kapahi, and Samuel Liu in 2019, Lumilens has now raised a total of $836.5M in total equity funding and is backed by Spark Capital, HarbourVest Partners, Peak XV Partners, Bain Capital Ventures, and Mayfield Fund.
Investors in the round: Addition, Alkeon Capital, Atreides Management, Bain Capital Ventures, EDBI, HarbourVest Partners, JP Morgan, Mayfield Fund, Meritech Capital Partners, MVP Ventures, Peak XV Partners, Qualcomm Ventures, Redpoint, Seifdune, Seligman Ventures, Spark Capital
Industry: AI Infrastructure, Industrial Automation, Manufacturing, Optical Communication, Semiconductor
Founders: Ankur Singla, David Friedman, Ritesh Kapahi, Samuel Liu
Founding year: 2019
Total equity funding raised: $836.5M

4. Form Energy $750.0M

Round: Series G
Description: Somerville-based Form Energy is an energy technology company that produces electric grids and accelerates the transition to clean energy. Founded by Marco Ferrara, Mateo Jaramillo, Ted Wiley, William Woodford, Yet Chiang, and Yet-Ming Chiang in 2012, Form Energy has now raised a total of $2B in total equity funding and is backed by Temasek, Sequoia Capital, Coatue, T. Rowe Price, and Franklin Templeton.
Investors in the round: Blindspot Ventures, Breakthrough Energy Ventures, Capricorn Investment Group, Cari Tuna, Coatue, Dustin Moskovitz, Energy Impact Partners, Engine Ventures, Franklin Templeton, GE Vernova, Gigascale Capital, Janus Henderson Investors, M&G Plc, NGP Energy Technology Partners, Peak 6, Prelude Ventures, Sequoia Capital, TPG Rise Climate Fund, T. Rowe Price
Industry: Battery, Clean Energy, Energy Storage, Manufacturing, Software
Founders: Marco Ferrara, Mateo Jaramillo, Ted Wiley, William Woodford, Yet Chiang, Yet-Ming Chiang
Founding year: 2012
Total equity funding raised: $2.0B

3. Castelion $800.0M

Round: Series C
Description: Torrance-based Castelion is a defense tech company that develops and manufactures modern weapons systems for the U.S. military. Founded by Andrew Kreitz, Bryon Hargis, Haffiz Bachok, and Sean Pitt in 2018, Castelion has now raised a total of $1.2B in total equity funding and is backed by Andreessen Horowitz, General Catalyst, Valor Equity Partners, Lightspeed Venture Partners, and T. Rowe Price.
Investors in the round: Altimeter Capital, Andreessen Horowitz, General Catalyst, Interlagos Capital, JPMorgan Chase & Co., Lavrock Ventures, Lightspeed Venture Partners, The Carlyle Group, T. Rowe Price
Industry: Aerospace, Government, Manufacturing, Military, National Security
Founders: Andrew Kreitz, Bryon Hargis, Haffiz Bachok, Sean Pitt
Founding year: 2018
Total equity funding raised: $1.2B

2. Base Power $1.0B

Round: Series D
Description: Austin-based Base Power provides home battery systems, electricity services, and energy management solutions for residential customers. Founded by Justin Lopas and Zachary Dell in 2019, Base Power has now raised a total of $2.3B in total equity funding and is backed by Andreessen Horowitz, Valor Equity Partners, Lightspeed Venture Partners, Spark Capital, and Coatue.
Investors in the round: Addition, Altimeter Capital, Andreessen Horowitz, CapitalG, Coatue, D1 Capital Partners, Energy Impact Partners, ID8 Investments, JPMorganChase, Layer Global, Lightspeed Venture Partners, Ribbit Capital, Sands Capital Ventures, Thrive Capital, Trust Ventures, Valor Equity Partners
Industry: Battery, Clean Energy, Energy, Energy Management, Energy Storage
Founders: Justin Lopas, Zachary Dell
Founding year: 2019
Total equity funding raised: $2.3B

2. Valar Atomics $1.0B

Round: Series B
Description: El Segundo-based Valar Atomics develops nuclear energy systems designed to supply industrial-scale power and produce energy-derived products. Founded by Isaiah Taylor in 2018, Valar Atomics has now raised a total of $1.5B in total equity funding and is backed by Valor Equity Partners, Sequoia Capital, Alumni Ventures, Conviction, and Erebor.
Investors in the round: Apandion, Atreides Management, Conviction, Dream Ventures, HOF Capital, Point72, Riot Ventures, Sequoia Capital, Snowpoint Ventures, Valor Equity Partners
Industry: Energy, Nuclear, Oil and Gas, Power Grid
Founders: Isaiah Taylor
Founding year: 2018
Total equity funding raised: $1.5B

1. River AI $1.1B

Round: Series A
Description: Palo Alto-based River AI provides an API for fine-tuning and reinforcement learning, enabling users to build and serve personalized AI models. Founded by Dmytro Soboliev, Ievgen Soboliev, and Igor Babuschkin in 2021, River AI has now raised a total of $1.1B in total equity funding and is backed by NVIDIA, Temasek, General Catalyst, Y Combinator, and AMP PBC.
Investors in the round: AMD Ventures, AMP PBC, General Catalyst, NVIDIA, Temasek, Y Combinator
Industry: AI Infrastructure, Artificial Intelligence (AI), Developer APIs, Generative AI, Machine Learning
Founders: Dmytro Soboliev, Ievgen Soboliev, Igor Babuschkin
Founding year: 2021
Total equity funding raised: $1.1B