Pioneer Square Ventures
Venture capitalActively deployingSeattle
Fund manager profile
Pioneer Square Ventures is a venture fund manager based in Seattle. SEC filings show 3 venture funds on record, most recently Pioneer Square Ventures Fund III, L.P. ($100M offering) filed April 2026.
Source: SEC EDGAR Form D filings. Firm website data not yet available.
What they invest in
from 4 of 4 portfolio companiesAI & Machine Learning ×2Enterprise Software ×2SaaS ×2B2B Marketplaces ×1Cybersecurity ×1Data & Infrastructure ×1E-commerce ×1Fintech ×1
HQs:United States×3
Investments · 4 tracked
founders shown can be your intro pathBy year:2025 · 12021 · 12015 · 13 dated
Flexe provides platform-based warehousing network management, handling implementation, onboarding, and operations across multiple locations for customers seeking to scale their logistics infrastructure.
B2B MarketplacesLogistics & Supply ChainSaaSSeattle, US
Karl Siebrecht(Co-founder & CEO)Edmond Yue(Director)Francis Duong(Director)Curt Anderson(CFO & COO)
Board seatMike Karl GalgonMike Galgon· per SEC Form D · $80M raise · filed Jan 2021
Co-investors137 VenturesAcequia Capital (AceCap)ACTIVATE CAPITAL PARTNERSMadrona Venture GroupRedpoint VenturesSecond Avenue Partners+1 more
Kamiwaza offers a distributed AI orchestration platform that processes data where it resides, allowing enterprises to deploy AI without centralizing data or compromising security.
AI & Machine LearningData & InfrastructureEnterprise SoftwareGovTechSilverthorne, US
Matthew Wallace(Executive Officer, Director)Luke Matthew Norris(Executive Officer, Director)
Board seatVivek Ladsariya· per SEC Form D · $8.5M raise · filed Jan 2025
Co-investorsAscend Venture CapitalCitta CapitalFirstMile VenturesGreater Colorado Venture FundAscendS3 Ventures
LumaTax is a platform that automates US and Canadian sales tax compliance, helping businesses manage nexus registration, tax filings, and remittance across multiple jurisdictions.
E-commerceFintechSaaSSeattle, US
Robert Schulte(Executive Officer, Director)
BoardChuck Stonecipher(Director)
Board seatGregory Gottesman· per SEC Form D · $6.1M raise · filed May 2021
Co-investorsMadrona Venture GroupTrilogy Equity Partners
Dropzone AI builds AI agents that investigate security alerts, hunt threats, and respond to cyberattacks for security teams and organizations.
AI & Machine LearningCybersecurityEnterprise Software
Edward Wu(Founder and CEO)in
Co-investorsDecibel PartnersMadrona Venture GroupTheory VenturesIn-Q-Tel
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 companiesDropzone · dropzone.ai · Jul 28, 2025
Frequently asked questions
- Where is Pioneer Square Ventures located?
- Pioneer Square Ventures is headquartered in Seattle, US.