Julius Knowles
Partner at Mass General Brigham Ventures
Cambridge, Massachusetts
Julius Knowles, Partner at Mass General Brigham Ventures is an active investor based in Cambridge, Massachusetts. This profile covers what Julius Knowles backs, at which stage, and how founders can reach out in 2026.
Julius Knowles invests in Healthcare & Biotech, MedTech & Medical Devices and Fintech, typically at Seed, Early Stage Venture, Series A and Series B. Portfolio companies on record include CoStim Pharmaceuticals, Magenta Therapeutics and ImmuneXcite.
- Location
- Cambridge, Massachusetts
- Typical check
- $1M
- Past investments
- 28
What does Julius Knowles invest in?
- Investor type
- VCPEFinance OperatorOperator
Where is Julius Knowles based?
Julius Knowles is based in Cambridge, Massachusetts.
- Browse more startup investors near Julius Knowles:
- Startup investors in BostonStartup investors in the United States
Which companies has Julius Knowles invested in?
Magenta Therapeutics
ImmuneXciteInStore FinanceZielBioTargAnox
Editas Medicine
Lysosomal TherapeuticsPykus TherapeuticsAnnovation BioPharma
Vertex Pharmaceuticals
Abcuro
Nocion TherapeuticsTranslate Bio
Sebacia
ROME TherapeuticsDaktari DiagnosticsSwanBio Therapeutics
Raze TherapeuticslifeIMAGE
Keros Therapeutics
Spero TherapeuticsAlizé Pharma
AkouosPlus 4 more companies on record.
How to reach Julius Knowles
Angels and operators like Julius Knowles reply to specific, personalized notes that show real traction, not mass blasts. Build a verified list, write a note that fits their thesis, and track replies, all on Round Funded.
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About this profile
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Cite this page
Round Funded. "Julius Knowles." Round Funded investor database, updated September 27, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/julius-knowles
Frequently Asked Questions
Who is Julius Knowles?
Julius Knowles, Partner at Mass General Brigham Ventures is an active investor based in Cambridge, Massachusetts. Julius Knowles invests in Healthcare & Biotech, MedTech & Medical Devices and Fintech, typically at Seed, Early Stage Venture, Series A and Series B. Portfolio companies on record include CoStim Pharmaceuticals, Magenta Therapeutics and ImmuneXcite.
What does Julius Knowles invest in?
Julius Knowles invests in Healthcare & Biotech, MedTech & Medical Devices and Fintech, typically at Seed, Early Stage Venture, Series A and Series B. Match your sector and stage, then reach out with a personalized pitch.
What stage does Julius Knowles invest at?
Julius Knowles typically invests at Seed, Early Stage Venture, Series A and Series B. Lead with traction that fits the stage when you reach out.
What is Julius Knowles's typical check size?
Julius Knowles typically writes checks around $1M. Use it as a signal for whether your raise fits their stage.
Where is Julius Knowles based?
Julius Knowles is based in Cambridge, Massachusetts.
Which companies has Julius Knowles invested in?
Companies Julius Knowles has backed, according to the Round Funded catalog, include CoStim Pharmaceuticals, Magenta Therapeutics, ImmuneXcite, InStore Finance, ZielBio and TargAnox.
How do founders reach investors like this?
Round Funded lists active investors with verified, professional contact details for signed-up founders. Filter by sector, stage and location, then send a personalized pitch from your own inbox.
What is Round Funded?
Round Funded is an investor database and outreach platform for startup founders. It lists 60,000+ active investors with verified contacts, filtered to recent investment activity, and lets founders send personalized pitches from their own Gmail, track replies, and share a free Data Room. Round+ starts at $99 per month with a 3-day trial.
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