Best Auto Components Companies in California, United States
The 289 best Auto Components companies in California, United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: QuantumScape.
Ranked: Best Auto Components companies in California
| # | Company | Disclosed funding | Last round | Employees | Founder | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|
| 1 | QuantumScape Developer of solid-state lithium-metal battery technology for electric vehicle applications | $1.0B | 69 mo ago | 850 850 → 672 (-21%) | Timothy Holme Co-Founder & CTO | DrupalApple iCloud MailPHP+28 | 285 patents Patents concentrated in electrical & electronics | 1 partnership |
| 2 | Divergent 🦄 Developer of adaptive production system for complex structures manufacturing 67Funding top 14%Moat top 25%Growth top 26%Talent top 38% All 10 signals ▾Fundingtop 14% Moattop 25% Growthtop 26% Talenttop 38% Patentstop 47% Markettop 48% Innovationtop 49% Techtop 49% Newstop 49% Globalbottom 42% Funding: Raised $578M across 10 rounds · 10 rounds over 10 yrs (1.0/yr) Moat: Editorial + unicorn rating 9/10 · IP moat: 24 patents rank vs industry peers · Fliar Intelligence Index 67/100 | $578M | 9 mo ago | 136 | Karolina Visser Co-Founder / COO | Node.jsReactNext.js+6 | 24 patents Advanced additive manufacturing of lightweight transport structures and multi-material components | 2 expansions · 1 award |
| 3 | Motorcar Parts Global leader in remanufactured auto parts, promoting sustainability and quality | $284M | 84 mo ago | 5,600 | — | Master SliderWordPressMySQL+21 | 8 patents Advanced alternator decoupling pulleys with torsional damping and illumination for vehicles | 2 awards |
| 4 | Bell Helmets Manufacturer of motorcycle and bicycle helmets and related apparel | $215M | 336 mo ago | 1,001 | Roy Richter Founder | Salesforce Commerce CloudApple iCloud MailMicrosoft 365+26 | — | — |
| 5 | Enevate Developer of lithium-ion batteries | $191M | 64 mo ago | 72 72 → 44 (-39%) | — | WordPress Block EditorWordPressApple iCloud Mail+13 | 766 patents Silicon-dominant anode materials, binders, and electrolytes for high‑energy fast‑charge batteries | — |
| 6 | Achates Power Manufacturer of engine for vehicles | $108M | 87 mo ago | 41 | — | WordPressMySQLPHP+26 | 542 patents Opposed‑piston engine design and hydrogen combustion systems for efficient power generation | — |
| 7 | Ionblox Developer of lithium-ion battery technology for automotive and aviation applications | $56M | 40 mo ago | 22 | Michael Sinkula Co-Founder | Squarespace CommerceSquarespaceYUI+8 | 22 patents Advanced silicon‑oxide anodes and prelithiation processes for high‑energy lithium‑ion batteries | — |
| 8 | IBC Platform offering prismatic lithium-ion cells for mobility and energy storage 35Growth top 31%Funding top 32%Tech top 44%Talent top 46% All 11 signals ▾Growthtop 31% Fundingtop 32% Techtop 44% Talenttop 46% Newsbottom 45% Globalbottom 45% Fin. healthbottom 44% Moatbottom 38% Innovationbottom 36% Patentsbottom 32% Marketbottom 14% Growth: Revenue +1937% YoY · Fresh capital in last 24 mo Funding: Raised $35.0M across 3 rounds · 3 rounds over 2 yrs (1.5/yr) rank vs industry peers · Fliar Intelligence Index 35/100 | $35M | 12 mo ago | 6 | Priyadarshi Panda Co-Founder & CEO | GoDaddy Website BuilderGoogle MapsVimeo+13 | 3 patents Electrical conduit connectors and metal strip casting equipment manufacturing | 1 job opening · 1 launch |
| 9 | Transonic Combustion Limited information available | $32M | 163 mo ago | — | Samir Kaul Co-Founder | — | 3 patents Patents concentrated in mechanical & energy engineering | — |
| 10 | Pinnacle Engines Designer and developer of automotive internal combustion engine system | $30M | 145 mo ago | 11 | Grace Overlander CEO | — | 120 patents Patents concentrated in mechanical & energy engineering | — |
| 11 | Owl Cameras Provider of vehicle dashcam hardware and related support services | $29M | 94 mo ago | 35 | Andrew Hodge Co-Founder & CEO | Cart FunctionalityShopifyYouTube+22 | 30 patents Vehicle-mounted camera systems with video analytics and networked surveillance for automotive safety | — |
| 12 | Conifer Provider of electric conversion kits for multiple categories of vehicles 24Funding top 33%Growth top 35%Talent top 38%Tech bottom 49% All 8 signals ▾Fundingtop 33% Growthtop 35% Talenttop 38% Techbottom 49% Globalbottom 35% Marketbottom 31% Patentsbottom 29% Innovationbottom 2% Funding: Raised $20.0M across 1 rounds · 1 rounds over 1 yrs (1.0/yr) Growth: Fresh capital in last 24 mo rank vs industry peers · Fliar Intelligence Index 24/100 | $20M | 14 mo ago | — | Ankit Somani Co-Founder | WebflowGSAPUmami+17 | 2 patents Decorative furniture components, specifically tree‑shaped sashes for interior furnishings | 1 launch |
| 13 | CDTi Catalyst technology company enabling clean energy transition and emissions reduction | $19M | 115 mo ago | 15 | — | WordPressMySQLPHP+25 | 55 patents Zero‑PGM emission catalysts: formulation, corrosion control, and oxygen storage for diesel/TWC systems | — |
| 14 | EmiSense Manufactures emissions sensors for use in vehicles | $10M | 158 mo ago | 4 | Patrick Thompson Founder | — | 22 patents Ceramic-based gas and particulate sensors with electrochemical detection | — |
| 15 | Troy Lee Designs Provider of helmet, gloves, and body protection products | $8M | 79 mo ago | 82 82 → 123 (+50%) | Troy Lee Founder | Cart FunctionalityShopifyRoute+33 | — | 1 launch |
| 16 | Fox Factory Racing suspension product manufacturer | $8M | 84 mo ago | 4,300 | Niels Ammendrup Chair/Founder | Cart FunctionalityShopifyApple iCloud Mail+30 | 1,375 patents High-performance bicycle suspension systems and disc brake components | 1 launch · 2 partnerships |
| 17 | Magnuson Provider of superchargers and other automotive parts | $7M | 88 mo ago | 23 | Kim Pendergast Chairman | Shogun Page BuilderCart FunctionalityShopify+27 | 9 patents Design of waste containers and automated pistachio/ corn processing equipment | — |
| 18 | HummingbirdEV Developer of powertrain system for commercial vehicles | $6M | 36 mo ago | — | Vinay Jayachand Co-Founder | — | 3 patents Grid‑aware adaptive charging systems for electric vehicles optimizing load and battery health | — |
| 19 | Omnitek Engineering Diesel to natural gas engine conversions and natural gas engines | $6M | 81 mo ago | 6 | Werner Funk CEO | FrontPageNginx | — | — |
| 20 | Thousand Manufacturer of stylish and safe bicycle helmets and accessories | $4M | 47 mo ago | 19 19 → 21 (+11%) | Gloria Hwang Founder & CEO | Cart FunctionalityShopifySentry+50 | 2 patents Helmet safety designs focusing on secure fastening openings for head protection | — |
| 21 | PureForge Atomic-Forged® brakes offering unmatched durability, performance, and lifecycle savings | $3M | 86 mo ago | — | Nathan Meckel Co-Founder & CTO | Cart FunctionalityShopifyVenmo+15 | — | — |
| 22 | AiResource Manufacturer and design of combustion engine system | $2M | 58 mo ago | — | Randy Chapman Founder & CEO | — | — | — |
| 23 | SaviCorp Manufacturer and supplier of automotive fuel system components | $1M | 124 mo ago | — | Serge Monros Founder & CEO | — | — | — |
| 24 | Directed Vehicle security and remote start systems, connecting cars with the cloud | $750K | 202 mo ago | 124 | — | YouTubeBootstraplit-html+12 | 27 patents Wireless vehicle access, proximity sensing, and telematics integration for automotive control systems | — |
| 25 | Clean Air Power Manufacturer and supplier of automotive filtration components | $553K | 164 mo ago | 14 | Dan Skelton CEO & President | — | — | — |
| 26 | Steinmetz Manufacturer of high-efficiency electric vehicle motor controllers | $500K | 12 mo ago | — | Owen Brake CEO | — | 2 patents Vehicle interior cargo floor design and occupant protection systems | — |
| 27 | Greenkraft Greenkraft: Environmentally friendly commercial trucks and vans with alternative fuel systems 8News top 49%Talent bottom 49%Growth bottom 47%Fin. health bottom 45% All 10 signals ▾Newstop 49% Talentbottom 49% Growthbottom 47% Fin. healthbottom 45% Fundingbottom 33% Globalbottom 32% Patentsbottom 26% Moatbottom 24% Marketbottom 23% Innovationbottom 4% News: 2 BI events in 12 mo (of 3 tracked, 2 types) · +100% YoY Talent: 1 named leader on record · 1 C-suite/founder profile curated rank vs industry peers · Fliar Intelligence Index 8/100 | $495K | 158 mo ago | 8 | George Gemayel CEO & President | — | 2 patents LPG fuel delivery systems for internal combustion engines | — |
| 28 | Blow & Drive Distributor of alcohol testing and art ignition interlock devices | $315K | 133 mo ago | — | David Haridim CEO & President | — | — | — |
| 29 | AMP Research Provider of retractable truck steps, bed extenders, and related accessories | $275K | 176 mo ago | 150 | — | — | — | — |
| 30 | OPTEC Manufacturer of automotive fuel maximizer | $150K | 82 mo ago | — | Roger Pawson Founder & CEO | — | — | — |
| 31 | XP Power Powering critical systems with reliable AC-DC, DC-DC, and high voltage solutions | $150K | 149 mo ago | 2,909 | — | Apple iCloud MailZURB FoundationTailwind CSS+26 | 256 patents Liquid-cooled, high-efficiency power supplies with integrated PFC/DC‑DC modules for IT hardware | 4 launchs |
Top 12 Auto Components companies in California
#1
Series E · Torrance, California · founded 2014 · 136 employees$578Mraised▾
Developer of adaptive production system for complex structures manufacturing. The system uses AI-enabled engineering software to optimize structure design based on performance and manufacturing constraints. Manufacturing instructions are sent to 3D printers to materialize individual printed nodes with application-specific alloys. A universal robotic assembly process assembles the printed nodes.
- Sep 2025Venture Debt$40M
- Sep 2025Series E$250M
- Jun 2024Conventional Debt$47M
- Nov 2023Series D$230M
#2
Series A · Milpitas, California · founded 2022 · 6 employees$35Mraised▾
Platform offering prismatic lithium-ion cells for mobility and energy storage. It focuses on cell design and manufacturing for various applications. It provides cells and tailored products to meet specific customer needs. The company offers end-to-end solutions for original equipment manufacturers and materials providers. It operates a pilot facility to test and validate manufacturing scalability.
- Jun 2025Series A$24.6M
- May 2025Seed$4.4M
- Jan 2024Seed$35M
#3
Seed · Sunnyvale, California · founded 2022$20Mraised▾
Provider of electric conversion kits for multiple categories of vehicles. Its conversion kit includes motors, controllers, batteries, and more. It also developed a patented axial flux motor technology with proprietary stator design, enabling high efficiency and power density using widely available ferrite magnets.
- Apr 2025Seed$20M
#4
Seed · San Francisco, California · founded 2024$500Kraised▾
Manufacturer of high-efficiency electric vehicle motor controllers. These controllers are designed for various applications, including industrial automation, robotics, and electric vehicles. The product line offers controllers optimized for different power levels and precision requirements, all featuring advanced features such as auto-tuning algorithms, open-source firmware, and multi-sensor support. The controllers are built for reliability and easy integration, utilizing compact designs and robust cooling methods.
- 2025Seed$500K
#5
Public · San Jose, California · founded 2010 · 850 employees$1Braised▾
Developer of solid-state lithium-metal battery technology for electric vehicle applications. The company focuses on next-generation batteries designed for greater energy density and faster charging. The technology aims to enhance safety to support the transition to a lower carbon future. The company developed an anode-less cell design to deliver high energy density.
- Sep 2020Post IPO$500M
- May 2020Series C—
- Sep 2018Series C$100M
- 2010Series A—
#6
Series E · Irvine, California · founded 2006 · 72 employees$191Mraised▾
Developer of lithium-ion batteries. It develops rechargeable energy storage technology. The platform provides batteries based on materials and battery structures that deliver higher capacity in smaller sizes while maintaining plug-and-play compatibility with existing Li-ion battery applications.
- Feb 2021Series E$81M
- Apr 2019Series B—
- Oct 2018Series B—
- Dec 2015Grant (prize money)$1.2M
#7
Series B · Fremont, California · founded 2017 · 22 employees$56Mraised▾
Developer of lithium-ion battery technology for automotive and aviation applications. The company focuses on extreme fast charging, extended range, and long-life battery solutions. It utilizes silicon monoxide to enhance battery performance. The company produces large format pouch cells using commercially scalable materials and equipment. The cell technology platform has undergone testing and validation.
- Feb 2023Series B$32M
- Oct 2022Series B$24M
#8
Public · Torrance, California · founded 2000 · 5600 employees$284Mraised▾
Global leader in remanufactured auto parts, promoting sustainability and quality. The company specializes in alternators, starters, master cylinders, hub assemblies, brake boosters, rotors, brake pads, shoes, and calipers. They offer private label services and a range of brands focused on quality and performance. Their core business revolves around remanufacturing, emphasizing lean manufacturing and IATF certification. They are committed to reducing material and energy consumption through sustainable practices. The company provides technical support, marketing services, and training programs. Their remanufacturing process significantly cuts down on waste and energy use, offering an eco-friendly alternative to new parts. This approach saves energy and materials while delivering dependable performance. They focus on renewing components to reduce greenhouse gas emissions and mitigate climate change impacts.
- Jun 2019Conventional Debt$269M
- Apr 2012Post IPO$15M
#9
Series D · San Diego, California · founded 2004 · 41 employees$107.5Mraised▾
Manufacturer of engine for vehicles
- Mar 2019Grant (prize money)$2M
- Oct 2017Series D$29.8M
- Dec 2015Grant (prize money)$9M
- Mar 2015Grant (prize money)$14M
#10
Acquired · San Francisco, California · founded 1954 · 1001 employees$215Mraised▾
Manufacturer of motorcycle and bicycle helmets and related apparel. The company designs and produces helmets for various riding styles, including street, dirt, adventure, mountain, road, and BMX. In addition to helmets, it offers apparel and accessories for both motorcycle and bicycle riders. The product line also includes spare parts and visors. A focus on safety and performance is evident in the company's commitment to technological advancements such as Spherical Technology, Flex Technology, ProTint, and MIPS.
#11
Series A · Livermore, California · founded 2015$6Mraised▾
Developer of powertrain system for commercial vehicles. The platform focusing on improving electric drivetrains, modular battery packs, charging, and vehicle integration. Its features includes power density of 10KW, 500kWh, diagnostic prediction, and more.
- 2023Series A$6M
#12
Series A · Palo Alto, California · founded 2016 · 35 employees$28.5Mraised▾
Provider of vehicle dashcam hardware and related support services. The company offered dashcam products for vehicles. It provided support services to customers who purchased its products. The company ceased operations but continues to offer support during a transition period.
- Aug 2018Series A$10.5M
- Feb 2018Series A$18M
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Auto Components coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
Common questions
Riya reads income statements for fun. She covers the real money in a sector — revenue, growth, who actually earns — and never met a vague claim she didn't want a number for.