Garrett Gilbertson

Founder & Managing Partner at SUM Ventures I Chairman Band of Angels LA

📍 Manhattan Beach, California, United States🔄 Updated September 2026💼 51 investments📅 9 years investing🗓 Last invested Jul 2026𝕏 @upgrade_to_unlock
VC🌍 United States50+ investmentsInvested this quarter
51
Total investments
16
Early stage
14
Mid stage
9
Late stage
9y
Years active

Portfolio

48 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Seed Investor
Jul 2026
We are digital pioneers in scientifically based and field-tested assistance solutions for nursing care. Our mission is to effectively support carers and care recipients in many care settings through our integrated applications. AssistMe erforscht und entwickelt technische Lösungen für den Medizin-, Pflege- und Gesundheitsbereich, um älteren und pflegebedürftigen Menschen ein unabhängiges Leben in ihrer häuslichen Umgebung zu ermöglichen. AssistMe GmbH erhält für das Projekt „DigiCare – Digitize Elderly Care“ Fördermittel des Landes Berlin sowie des Europäischen Fonds für regionale Entwicklung. Das Projekt „DigiCare“ dient der wirksamen Entlastung von Pflegekräften durch die digitale Unterstützung zentraler pflegerischer Prozesse. Datenschutz: https://www.assistme.io/datenschutz Impressum: https://www.assistme.io/impressum
Seed Investor
Jul 2026
Founded in 2023, Root is a next-generation social platform that combines communication tools with a customizable app framework, allowing communities to organize, coordinate, and extend their functionality through apps. Root’s closed beta begins soon, with a full platform launch planned for late 2025. Users can join the waitlist at rootapp.com.
Pre-Seed Investor
Jun 2026
We help companies build right products 10x faster for their target segments.
Seed Investor
Apr 2026
Bringing computer vision and AI/ML products to the edge. From R&D to Product Our team has experience conducting research starting at Technology Readiness Level 3 up through production and fielding. Where most small firms stop at the acquisitions "Valley of Death," we can help you go from experiment to product. Sensors and Robotic Systems With a strong background in sensors, field robotics, and embedded machine learning, we can help you leverage the best practical technology available to solve your problems. Domestic Manufacturing We do prototype and low-rate manufacturing right here in-house. Modern manufacturing equipment enables us to re-shore domestic manufacturing. Our current investments include an SMT pick and place line, robotic work cells, camera focus, sensor calibration, and light machining. Were building our process to be FAR compliant and meet AS9100D for quality. Wed be excited to be a trusted supplier for you. Partnerships We think that our transparent, frank, and honest approach to doing business makes us a trustworthy partner that will be a steward of your interests. Have a team capability or skill gap that needs to be filled? Have a sensor or robotics R&D project to transition to product? We are a flexible partner that would love to speak with you about your needs.
Seed Investor
Dec 2025
In the next high-intensity conflict, the U.S. will not have time to surge production. We are building systems that can be produced affordably and fielded in quantity - now. Purple Rhombus designs and manufactures fixed-wing UAS built for mass production and operational use - not for showroom demonstrations. Our WASP family is designed from the outset for mass production - built with precision-formed metal airframes, modular architecture, and manufacturing processes that can deliver meaningful quantities today. We build aircraft the way warfighting equipment should be: repeatable processes, proven materials, and production lines that can scale - not boutique composites or fragile prototypes.
Seed Investor
Nov 2025
Transparency Analytics leads the way in measuring and pricing private credit risk. Contact us to discuss private credit ratings and analytics, private credit indices, and private credit reference pricing.
Seed Investor
Jun 2025
At WurQ, we track 70+ movements to provide meaningful insights for functional training—not just heart rate or calories. The platform helps athletes and fitness providers manage workloads and optimize outcomes through seamless monitoring of workout structure, volume, form, and more. Our vision is to enhance physical potential through accountability and personalization. Backed by Harvard University, the National Science Foundation, and the NFL Players Health Study, we’re advancing movement tracking and analyses with cutting-edge technology.
Pre Seed Investor
Jun 2025
Were on a mission to help investors make smarter investments in early-stage companies while helping founders become better leaders and fiduciaries.
Pre-seed Investor
Jan 2025
Instant Action is a marketing technology platform that transforms regular text messaging into highly engaging, video-first, action-oriented mobile marketing; complete with ‘action social graph’ analytics. It transforms TikToks and Instagram Reel style videos into conversion magic. Optimized for short-attention-spans, each Instant Action video message (which can be sent via SMS or any other mobile messaging platform) arrives pre-loaded with one of a broad (and growing) library of integral Actions, including: - Drive Web Traffic - Drive Sales or Donations - Stimulate Sharing & List Building - Distribute Coupons & Deal Offers - Boost Google Reviews - Drive App Store Downloads - Facilitate Voter Registration - Capture Opinions (Polling) - Event Registration & Ticketing
Seed Investor
Jan 2025
“The specific public benefit purpose of the Corporation is to economically scale an energy efficient adhesive, improving environmental sustainability in commercial applications and simplifying attachment and adhesion for consumer applications.” -geCKo Materials, PBC
Pre-seed Investor
Jan 2025
At THIA, we build and manage AI that autonomously handles complex workflows, using our groundbreaking THIA platform. Unlike template-based tools and generic datasets, THIA integrates directly with your processes, data streams, business logic, and decision-making. The result, an intelligent system that unlocks productivity by handling the tasks and challenges your team faces every day. Learn more about how THIAs patented architecture and proprietary techniques can unlock AIs potential for your organization at thiaplatform.ai.
Seed Investor
Oct 2024
Sweater is the first VC fund for everyday investors. Until now, venture capital investing has been an asset class exclusively available to a select few. Sweater is transforming that. Our mobile-first experience allows everyone direct access to the worlds most exclusive asset class—Venture Capital. Sweater’s mission is to empower everyone to become investors in the next generation of venture-backed startups. https://www.sweaterventures.com/socialmedia
Seed Investor & Advisor
Aug 2024
Founded by the "Godfather of Fantasy Sports", Matthew Berrys Fantasy Life is a multi-media content company that delivers engaging and entertaining content to a purpose built community of avid football fans. Fantasy Life covers fantasy sports from every angle including Daily Fantasy Sports and Sports Betting. With a roster of world class content creators, Fantasy Life is delivering the very best content, data and tools to fans looking for that winning edge. Fantasy Life content platforms: -Daily Newsletter delivered to 300k+ fans with industry defying engagement with open rates over 50%. -Fantasy Life on SiriusXM, M-F 11a-1p starring Kendall Valenzuela and Peter Overzet -Fantasy Life Vodcast featuring Dwain McFarland, Marcas Grant, Ian Hartitz, Pete Overzet and Chris Allen -Over 2m monthly views across Social Media Platforms
Seed Investor
Jun 2024
Oze is a platform that equips small business owners in Africa to make data-driven decisions to improve their performance, tap into networks, and access capital. Oze’s platform is comprised of two components. On one side is an mobile app for a small business owners that aggregates and analyzes transaction data to push context-specific recommendations and reports. On the other side is a portal for financial institutions that combines the app’s crowdsourced data with alternative data sources to assign a credit risk score to each Oze user. Through the portal, banks can source and support a small-business loan portfolio.
Show all 48 investments ↓
Experience · 59 entries
All (59)
Investments (51)
Founder (3)
Board (3)
2026
Seed Investor
Jul 2026
We are digital pioneers in scientifically based and field-tested assistance solutions for nursing care. Our mission is to effectively support carers and care recipients in many care settings through our integrated applications. AssistMe erforscht und entwickelt technische Lösungen für den Medizin-, Pflege- und Gesundheitsbereich, um älteren und pflegebedürftigen Menschen ein unabhängiges Leben in ihrer häuslichen Umgebung zu ermöglichen. AssistMe GmbH erhält für das Projekt „DigiCare – Digitize Elderly Care“ Fördermittel des Landes Berlin sowie des Europäischen Fonds für regionale Entwicklung. Das Projekt „DigiCare“ dient der wirksamen Entlastung von Pflegekräften durch die digitale Unterstützung zentraler pflegerischer Prozesse. Datenschutz: https://www.assistme.io/datenschutz Impressum: https://www.assistme.io/impressum
Seed Investor
Jul 2026
Founded in 2023, Root is a next-generation social platform that combines communication tools with a customizable app framework, allowing communities to organize, coordinate, and extend their functionality through apps. Root’s closed beta begins soon, with a full platform launch planned for late 2025. Users can join the waitlist at rootapp.com.
Pre-Seed Investor
Jun 2026
We help companies build right products 10x faster for their target segments.
Seed Investor
Apr 2026
Bringing computer vision and AI/ML products to the edge. From R&D to Product Our team has experience conducting research starting at Technology Readiness Level 3 up through production and fielding. Where most small firms stop at the acquisitions "Valley of Death," we can help you go from experiment to product. Sensors and Robotic Systems With a strong background in sensors, field robotics, and embedded machine learning, we can help you leverage the best practical technology available to solve your problems. Domestic Manufacturing We do prototype and low-rate manufacturing right here in-house. Modern manufacturing equipment enables us to re-shore domestic manufacturing. Our current investments include an SMT pick and place line, robotic work cells, camera focus, sensor calibration, and light machining. Were building our process to be FAR compliant and meet AS9100D for quality. Wed be excited to be a trusted supplier for you. Partnerships We think that our transparent, frank, and honest approach to doing business makes us a trustworthy partner that will be a steward of your interests. Have a team capability or skill gap that needs to be filled? Have a sensor or robotics R&D project to transition to product? We are a flexible partner that would love to speak with you about your needs.
Seed Investor
Feb 2026
Nuvola Technology (nuvola.tech) formally Millibatt, Inc. is an advanced battery materials company rapidly commercializing SafeCoat™ DDS, a direct deposition polymer battery separator technology. SafeCoat DDS eliminates the primary cause of EV and other high-energy battery fires by replacing troublesome plastic film separator material with an innovative sprayed polymer separator material that fully encapsulates the entire electrode surface. High-energy batteries built with SafeCoat DDS separator material are safer, have higher energy capacity, and are more profitable to manufacture.
Show all 59 entries ↓
Investment activity
2017–2026 · 51 investments
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