/Investor DB

Keystone — Full Portfolio

8 tracked investments · listed companies and verified rows first

CERo TherapeuticsOTC: CEROMay 2026

CERo Therapeutics develops engineered T cell immunotherapies designed to treat cancer by combining innate and adaptive immune mechanisms; the company is conducting clinical trials of CER-1236, an autologous T cell product targeting TIM-4 ligand, in acute myeloid leukemia and other hematological malignancies, with planned expansion into solid tumors including non-small cell lung cancer and ovarian cancer.

San Francisco, US

Daniel Mark Corey(Director)Lawrence Corey(Executive Officer, Director)Jordan Thomas Corey(Executive Officer)

Allure Systemsalluresystems.cominSeedAcquired

Allure Systems develops generative AI technology that produces product images for fashion retailers, allowing brands to generate variations of apparel photos on different models and sizes without requiring physical photoshoots.

AI & Machine LearningE-commerceEnterprise SoftwareNew York City, US

Jeremy CHAMOUX(Founder)inGabrielle CHOU(Founder)in

Co-investorsITERATIVEMAGIC FundUtopian VenturesY CombinatorAgrolimen VenturesJapan Angel Fund+7 more

Four Growersfourgrowers.cominSeed

Four Growers develops automated solutions for greenhouse crop management to support the agricultural technology sector.

Advanced ManufacturingAgTechFoodTechHardwareRoboticsPittsburgh, US

Brandon Contino(CEO)inDan Chi(CTO)inJohn P. Quayle(Chief of Staff)inDan Chișu(Founder)inCameron Beichner(Chief of Staff)John Quayle(Chief of Staff)

Co-investorsAmritam HoldingsBetter Food VenturesCathexis VenturesGagarin Capital PartnersOspraie Ag ScienceStage 1 Ventures+6 more

Greeley Companygreeley.comin𝕏

A staffing agency that places interim executives and healthcare professionals in clinical, business, and administrative roles within healthcare organizations to support mission-critical initiatives and operations.

Digital HealthEnterprise SoftwareHealthtechHR Tech

Co-investorsHalyard

InnoVeininnoveinmedical.com𝕏SeedDefunct

Online138 is an Indonesian platform offering World Cup-themed gaming experiences and a skills marketplace (SkillConnect) connecting users with local tutors, designers, tradespeople, and service providers.

GamingHealthtechMarketplacesMedical DevicesSan Francisco, US

Austin Walker(CEO)inAl Chin(Founder)inTom Kramer(Founder)inThomas Harold Pierce(Executive Officer, Promoter)

Co-investorsHemisphere Ventures LLCPallasite VenturesStartXY CombinatorAgrolimen VenturesAmzak Health+10 more

JetPack Aviationjetpackaviation.com𝕏Seed

JetPack Aviation designs and builds turbine-powered micro VTOL aircraft, including jetpacks, developing everything in-house from mechanical to flight systems.

Advanced ManufacturingDeep TechHardwareMobility & TransportationSpace TechLos Angeles, US

Boris Jarry(Operations Director)inDavid Mayman(Founder)inAlex Bock(Lead Mechanical Engineer)Daniel Fox(Chief of staff)

Co-investorsCathexis VenturesDraper AssociatesHemisphere Ventures LLCMetaplanetRosecliff VenturesY Combinator+2 more

NEXGENTngt.academyin𝕏Seed

NGT Academy provides hands-on IT training and certification programs designed for working adults seeking to transition into tech careers without traditional four-year degrees.

CybersecurityDeveloper ToolsEdTechEnterprise SoftwareFuture of WorkSan Francisco, US

Terry Kim(CEO)inJonathan Tang(Investor)inJonathan Weins(Investor)inJacob Hess(COO)Robert Kao(COO)Daiki Kohara(CTO)

Co-investorsY CombinatorG VenturesGaruda VenturesMontage CapitalVentureSouqACME Capital+9 more

Suitenesssuiteness.comin𝕏Seed · Dec 2016

Suiteness allows groups to book connecting hotel rooms that aren't available through standard hotel booking platforms.

B2B MarketplacesConsumerMarketplacesTravel & HospitalitySan Francisco, US

Robbie Bhathal(CEO)inKyle Killion(Founder)inRUPINDER BHATHAL(Executive Officer, Director)Stephen Caudill(CTO)Laura Burch(Vice President of Marketing)Jeanna Fickenscher(Concierge Team Lead)

Co-investorsBullpen CapitalFundersClubKima VenturesY Combinator10x GroupAltaIR Capital+7 more

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.