3x5 Partners
Venture capitalPortland
Fund manager profile
3x5 Partners is a venture fund manager based in Portland. SEC filings show 3 venture funds on record, most recently 3X5 PARTNERS FUND III-B, L.P. filed November 2020.
Source: SEC EDGAR Form D filings. Firm website data not yet available.
What they invest in
from 4 of 6 portfolio companiesHardware ×2Healthtech ×2Biotech ×1Cleantech ×1Climate Tech ×1Energy ×1Medical Devices ×1
HQs:United States×6
Investments · 6 tracked
founders shown can be your intro pathBy year:2026 · 12017 · 22015 · 25 dated
Portland, US
Mark Shaughnessy(Director)Brad Barnhorn(Director)Anthony Arnerich(Director)Ken Plasse(Executive Officer, Director)Duncan Berry(Director)Nicholas Walrod(Director)
Board seatAnthony Arnerich· per SEC Form D · $1 raise · filed May 2017
Portland, US
Plasse Ken(Executive Officer, Director)
BoardTyler Mayoras(Director)Nicholas Walrod(Director)Chuck Templeton(Director)Mark Shaughnessy(Director)
Board seatAnthony Arnerich· per SEC Form D · $32.2M raise · filed May 2017
EnergyOakland, US
James C David(Executive Officer, Director)Woody Gibson(Executive Officer)Stewart Ramsay(Executive Officer, Director)
BoardJay Schmelter(Director)inTony Arnerich(Director)
Board seatAnthony ArnerichNicholas Walrod· per SEC Form D · $85.8M raise · filed Jan 2020
Co-investorsEnergy Transition VenturesRiverVest Venture Partners
Vapotherm manufactures high-velocity therapy devices for respiratory distress treatment across patient populations.
HardwareHealthtechMedical DevicesExeter, US
JOSEPH ARMY(Executive Officer, Director)JOHN LANDRY(Executive Officer)
BoardJASON LETTMAN(Director)GEOFF PARDO(Director)SAMUEL BRASCH(Director)
Board seatAnthony Arnerich· per SEC Form D · $20M raise · filed Jul 2015
Co-investorsCross Creek AdvisorsKaiser Permanente VenturesQuestMark Partners
Wildfire Water Solutions builds high-volume water delivery networks using mobile pumps, high-pressure hoses, and storage tanks (3,000 to over 3 million gallons) for wildfire response and long-term protection.
CleantechClimate TechHardwareBend, US
Brianna Blazek(Executive Officer)Michael Echols(Executive Officer, Director)
BoardMatt Diserio(Director)Chris George(Director)John Schmitz(Director)
Board seatAnthony Arnerich· per SEC Form D · $8M raise · filed Jul 2026
Bonum Therapeutics develops antibody-controlled protein therapeutics that remain inactive until bound to their target, using a sensor-domain mechanism to deliver regulated, targeted activity.
BiotechHealthtechSeattle, US
John Mulligan(Executive Officer, Director, Promoter)inNeela Patel(Executive Officer)inDiane Hollenbaugh(Executive Officer)in
BoardSamuel Bjork(Director)inMonique Schiersing(Director)inJohn McKearn(Director)in
Co-investorsRiverVest Venture PartnersRoche Venture FundVivo CapitalCodon CapitalDigitalis Ventures
Rows marked “SEC filing” are inferred from directors named on the company's SEC Form D — public regulatory data, not a portfolio list published by the firm.
Portfolio news
latest coverage across their companiesVapotherm · ad-hoc-news.de · Apr 18, 2026
Bonum Therapeutics · biospace.com · Jun 10, 2025
Frequently asked questions
- Where is 3x5 Partners located?
- 3x5 Partners is headquartered in Portland, US.