Fundraising Fox

Seth Rosen

Investor

Venture Partner at Western Technology Investment · Executive at CustomMade

Boston, Massachusetts

Writes $100K – $5M checks · typically $1.5M

Find your path to Seth

249 people in our graph share verified history with Seth — schools, employers, funds. One of them is your warm intro.

Tom MendozaunlockedSeth: together at Bentley University (2003–2004)
×8Seth: together at Bentley University
×3Seth: together at Western Technology Investment

About

Seth Rosen is CEO of CustomMade, an e-commerce marketplace for custom products that he acquired in 2009, raised $30M in venture funding for, and repurchased and relaunched in 2015 to become the world's largest online custom jeweler. He also acquired and operates International Gem Society and Ganoksin, two niche websites in gemology and jewelry manufacturing with over 30M annual visitors combined. Rosen serves as a Venture Partner at Western Technology Investment focused on the Boston market and previously held the position of partner at Meredith & Grew in commercial real estate capital markets; he holds an MBA and MST from Bentley University and an undergraduate degree from Boston University.

Executive at CustomMade

Intro paths

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In turn, Seth can intro founders to CustomMade's investors below.

CustomMade's investors · 7

Atlas VentureCambridge · $500K – $1M checksFirst Round CapitalSan Francisco · $1M – $7M checksFounder CollectiveCambridgeGV (Google Ventures)Mountain View · $250K – $50M checksLaunch CapitalTorontoNextView VenturesSan Francisco · $250K – $4M checksSchooner CapitalBoston

Experience

  1. Standard DentalBoard Observer - Lender Representativecurrent2025 — presentMiami, Florida, United States
  2. Gold Words, Inc.Board Observer - Lender Representativecurrent2024 — presentAkron, Ohio, United States
  3. eCom Brand HoldingsBoard Observer - Lender Representativecurrent2023 — presentAkron, Ohio, United States
  4. Western Technology InvestmentVenture Partner | Private Credit, Special Situations & Direct Lending | Operator Backgroundcurrent2021 — presentBoston, MA
  5. CustomMadeFounder & CEOcurrent2015 — presentCambridge, Massachusetts
  6. CustomMadeCo-Founder, President & Board Chairman2009 — 2015Cambridge, MA
  7. International Gem SocietyOwnercurrent2012 — presentLincoln, Massachusetts
  8. The Ganoksin ProjectOwnercurrent2016 — presentLincoln, MA
  9. Boston UniversityFaculty Member – CPE Program (Capital Markets Class)2008 — 2009Boston, MA
  10. Colliers International, Boston (fka Meredith & Grew, Inc.)Vice President & Shareholder2004 — 2009Boston, MA
  11. East Coast Realty, Inc.Manager2001 — 2004Boston, MA

Skills & more

Microsoft Excel2ExcelEntrepreneurship57Venture Capital42Jewelry and GemologyStrategy45Financial Modeling22Financial Analysis18Start-ups14Private Equity13Online Marketing8SEO5
+12 moreE-commerceCapital MarketsFinanceBusiness StrategyMarketingValuationSalesBusiness DevelopmentCorporate FinanceJoint VenturesAnalysisLeadership

Languages Spanish

  • Massachusetts Notary Public — Commonwealth of Massachusetts
  • Massachusetts Real Estate Broker — B​o​a​r​d​ ​o​f​ ​R​e​g​i​s​t​r​a​t​i​o​n​ ​o​f​ ​R​e​a​l​ ​E​s​t​a​t​e​ ​B​r​o​k​e​r​s​ ​a​n​d​ ​S​a​l​e​s​p​e​r​s​o​n​s
  • Series 65 - Uniform Investment Adviser Law Examination — FINRA

From Seth's professional profile.

Colleagues at Western Technology Investment

Maurice Werdegar
Investor at Streamlined Ventures
Patrick Ward
Principal and Portfolio Manager at Western Technology Investment
Rishabh Nijhawan
Senior Associate at Western Technology Investment
Rudy Ruano
Investment Partner at Western Technology Investment

Frequently asked questions

Who is Seth Rosen?
Seth Rosen is CEO of CustomMade, an e-commerce marketplace for custom products that he acquired in 2009, raised $30M in venture funding for, and repurchased and relaunched in 2015 to become the world's largest online custom jeweler. He also acquired and operates International Gem Society and Ganoksin, two niche websites in gemology and jewelry manufacturing with over 30M annual visitors combined. Rosen serves as a Venture Partner at Western Technology Investment focused on the Boston market and previously held the position of partner at Meredith & Grew in commercial real estate capital markets; he holds an MBA and MST from Bentley University and an undergraduate degree from Boston University.
Where does Seth Rosen work?
Seth Rosen is Venture Partner at Western Technology Investment and Executive at CustomMade.
What check size does Seth Rosen write?
Seth Rosen typically writes checks of $100K – $5M.
Where did Seth Rosen go to school?
Seth Rosen studied at Boston University (Bachelor's Degree, Psychology); Bentley University (Master of Science in Taxation - MST); Bentley University (Master of Business Administration - MBA, Concentration in Taxation & Structured Finance).

Founder mafias

Boston University mafia187

Also came through, then founded or led a company.

Arjun SethiBA (WIP)Founded Termina +4Oleg RogynskyyBachelor's DegreeFounded UFORCE Acquired +2Ben ZisesFounded Superangelsyndicate +2Sanjiv SanghaviBAFounded Texture +2Dave KerpenBS and BAFounded Likeable Local +2Brandon PatonBAFounded Glider +2

+ 180 more

Bentley University mafia28

Also came through, then founded or led a company.

Andrew SpellmanBachelor's DegreeFounded Fifth Down Cap +1Amanda HesserBSFounded Food52 +1Dan HurwitzBSFounded TowerIQ +1Joe MarcheseBAFounded Human VenturesHans ChristensenBachelor of Science - BSFounded Garderos GmbHMarcio Lempert---Founded Red Access

+ 21 more

Western Technology Investment mafia2

Also came through, then founded or led a company.

Annelies GamblePrincipalFounded Prima

Same school

Also attended Boston University554

Aydin SenkutFounder & Managing Partner at FelicisVinnie LauriaFounding Partner at Golden Gate VenturesJeff GrammerPartner at Rho VenturesGil GorenPartner at 83NorthJames LindenbaumCo-founder at HeavybitDave BiscegliaVenture Partner at Founder Collective

+ 548 more

Also attended Bentley University182

Jessica DowdInvestor at OpenView Venture PartnersBrett RippergerDirector, Investor Reporting & Business Analytics at Sapphire VenturesAva BrunelleInvestor at Third Rock VenturesGabriella WilliamsInvestor at Third Rock VenturesGreg O'BrienInvestor at Third Rock VenturesTom MendozaInvestor at EQT Ventures

+ 176 more

Shared employers

Also worked at CustomMade1

Mike SalgueroCEO, ButcherBox & Founding Pillar at Pillar VC

Also worked at Boston University94

William WooImpact at Non Sibi VenturesYousuf ShehadiTalent at AudaciousMatt MorrisSenior Associate at Hitachi VenturesCorey ThomasChairman & CEO of Rapid7 at Underscore VCMay AlSalehInvestment Associate at Outliers VCRiddhi KhinchaSenior Analyst at CVS Health Ventures

+ 88 more

Also worked at Colliers International, Boston (fka Meredith & Grew, Inc.)38

Casy van MaanenAssociate at GTMfundHarry BrodyInvestor at Maor InvestmentsMarius EisfeldAssociate at Seed+SpeedGraham CujeSenior Associate at Harbert Growth PartnersDhruv GuptaInvestment Manager at Pi LabsJoanna LambertCOO, Olo at The 98

+ 32 more