H3X Technologies
YC W21 ↗Denver, US · Founded 2020 · Delaware corporation · 58 employees · 8 known investors
H3X designs and manufactures advanced electric motors for industrial applications. The company operates a full-stack engineering facility with in-house manufacturing capabilities including CNC machining, power electronics labs, and test cells.
Advanced ManufacturingClimate TechDeep TechEnergyHardwareSpace TechAirplanesClimateElectric Vehiclesin /h3x-technologies@h3x_techycombinator.com ↗
Founders & leadership· Y Combinator alumni (W21)
EM
Eric MaciolekinFounder
JS
Jason SylvestreinFounder
ML
Max LibenExecutive Officer
ND
Nathan DoctorDirector
Investors · 8
Industrious VenturesDenver
MetaplanetTallinn · $500K – $10M
Origin VenturesSan Francisco · $500K – $5M
Y CombinatorSan Francisco · $500K
Cubit CapitalreportedDallas · $500K – $3M
Lockheed Martin VenturesreportedBethesda
Lombardstreet VenturesreportedWoodside · $500K
Soma CapitalreportedSacramento · $100K – $300K
Reported raises · per SEC filings
Form D private placements▶$20.3MraisedAug 2024 · 25 investors · Other TechnologyRule 506(b)
▶$20.3MraisedAug 2024 · 25 investors · Other Technology
Rule 506(b)Officers, directors & promoters on the filing
- Eric MaciolekExecutive Officer, Director
- Jason SylvestreExecutive Officer, Director
- Max LibenExecutive Officer
- Nathan DoctorDirector
- Offering amount
- $20.3M
- Amount sold
- $20.3M
- First sale
- Mar 2024
- Incorporated
- Corporation, Delaware, 2020
- Federal exemptions
- 06b
▶$3MraisedMar 2023 · 1 investors · Other TechnologyRule 506(b)
▶$3MraisedMar 2023 · 1 investors · Other Technology
Rule 506(b)Officers, directors & promoters on the filing
- Jason SylvestreExecutive Officer, Director
- Eric MaciolekExecutive Officer, Director
- Max LibenDirector
- Offering amount
- $3M
- Amount sold
- $3M
- First sale
- Feb 2023
- Incorporated
- Corporation, Delaware, 2020
- Federal exemptions
- 06b
▶$1.8MraisedJun 2022 · 2 investors · Other TechnologyRule 506(b)
▶$1.8MraisedJun 2022 · 2 investors · Other Technology
Rule 506(b)Officers, directors & promoters on the filing
- Max LibenDirector
- Jason SylvestreExecutive Officer, Director
- Eric MaciolekExecutive Officer, Director
- Offering amount
- $2M
- Amount sold
- $1.8M
- First sale
- Jun 2022
- Incorporated
- Corporation, Delaware, 2020
- Federal exemptions
- 06b
▶$4.3MraisedJun 2022 · 44 investors · Other TechnologyRule 506(b)
▶$4.3MraisedJun 2022 · 44 investors · Other Technology
Rule 506(b)Officers, directors & promoters on the filing
- Jason SylvestreExecutive Officer, Director
- Max LibenDirector
- Eric MaciolekExecutive Officer, Director
- Offering amount
- $4.3M
- Amount sold
- $4.3M
- First sale
- Jan 2021
- Incorporated
- Corporation, Delaware, 2020
- Federal exemptions
- 06b
Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.
In the news
- H3X Technologies Funding | $5-7.6M Revenue | Complete Analysis | Extruct AIextruct.ai · 2025
- Louisville’s H3X Technologies raises $20M Series A round – BizWestbizwest.com · 2024
- Revolutionizing Sustainability: H3X Technologies Secures $20 Million in Funding for High Power Density Electric Motors | Signalbaseleadsontrees.com · 2024
- Lockheed Martin Backs Megawatt-class Electric Propulsion Developer H3X | FutureFlightfutureflight.aero · 2023
- H3X Ships Advanced Electric Drives For Customer Testing | Aviation Week Networkaviationweek.com · 2023
- H3X startup has motor drives that could help electrify flight | Automotive Newsautonews.com · 2022
- Start-up Promises All-electric Propulsion For 100-Seater Airliners | Air Transport News: Aviation International Newsainonline.com · 2022
- H3X Raises $3.8M Seed to Develop New Electric Aircraft Motors | by H3X Technologies | Mediumh3x-technologies.medium.com · 2021
