Investing Profile

Mark Jacobstein(228)

VCFormer CEOFounderOperator
Advisor at Sleuth
nearhorizon.vc/experienceStanford, California
Photo of Mark Jacobstein, Advisor at Sleuth
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Mark Jacobstein's investing connections

Connected to 33 investors on Signal.

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Networks Mark is a member of
NewCo Network
1599 CONNECTIONS
NewCo Network
1599 CONNECTIONS
NewCo Network
1599 CONNECTIONS
NewCo Network
1599 CONNECTIONS
NewCo Network
1599 CONNECTIONS

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Current Investing Position
Sleuth Advisor
Investment Range
$500K - $1.2M
Sweet Spot
$1M
Investments On Record
8

Mark Jacobstein is on these Sector & Stage Rankings

Mark Jacobstein's Investments On Record (8)

CompanyStageDateRound SizeTotal Raised
OurHealthMate
SeedNov 2017$1M
$1.6M
Co-investors: Dan Rose (Coatue), Benjamin Tsai (Cardinal Mark Investments, LLC), Clark Landry (CESPPA), Charlie Songhurst
Nuzzel
SeedNov 2012$2M
$6M
Co-investors: Jeff Clavier (Uncork Capital), George Zachary (CRV), Ullas Naik (Streamlined Ventures), James Currier (NFX), Stan Chudnovsky (NFX), Zachary Bogue (DCVC (Data Collective)), Andrew Miller (Generate), Mark Goldstein (Builders VC), Matt Cutts (United States Digital Service), Philip Kaplan (DistroKid), Matt Mazzeo (Coatue Management), Narendra Rocherolle (The Start Project), Ryan Spoon (ESPN), Kent Lindstrom (8-Bit Capital), Jon Nordmark (Angel), James Hong (NewCo), Raymond Tonsing (Caffeinated Capital), Eric Ries (O'Reilly Media), Dave McClure (Practical Venture Capital), Michael Marquez (Morado Venture Partners), Max Levchin (Scifi Vc), Michael Birch (The Battery), Rick Marini (Catapult Capital), Nellie Levchin (Scifi Vc), Ashvin Patel (Morado Venture Partners), Alexander Rosen (Ridge Ventures (Formerly known as IDG Ventures USA)), Alex Rosen (Ridge Ventures (Formerly known as IDG Ventures USA)), Anthony Soohoo (AI Fund), Ronny Conway (A Capital), Steve Chen, Anil Dharni, Akash Garg, Dharmesh Shah, Ronny Conway, Russ Fradin, Jim Young, Othman Laraki, Jonathan Boutelle, Marc Benioff, Russell Fradin
Scoot
SeedJun 2012$230K
$9.2M
Co-investors: Gady Nemirovsky (Inspiration Ventures), Joanne Wilson (Gotham Gal Ventures), David Wu (Maveron), Melissa Krinzman (Krillion Ventures), Bradley C. Harrison (Scout Ventures), Jerry Fiddler, Lisa Gansky, Dave Graham
Disconnect
SeedMar 2012$600K
$4.6M
Co-investors: Rick Heitzmann (FirstMark Capital), Ramesh Haridas (Deeptech Labs), Vikas Taneja, David Cancel
Badongo.com
Series AJan 2006
Co-investors: Fabrice Grinda (FJ Labs), Saar Gur (CRV), Peter Thiel (Founders Fund), Alec Oxenford (Alpha Capital Acquisition Company), Lukasz Gadowski (Team Global), Geoff Ralston (NewCo), Jon Staenberg (rocketship.vc), Stephan Paternot (PalmStar Entertainment), Tim Ferriss (Angel investor), Ariel Poler (TextMarks), Oliver Jung, Mark Gerson
Overclock Labs, creators of Akash Network
AngelN/A
Co-investors: Itamar Novick (Recursive Ventures)
GLG - Gerson Lehrman Group
AngelN/A
Elation EMR
AngelN/A

Mark Jacobstein's Experience

General Partner South Park Commons2026 - Present
Venture Builder NewCo2023 - Present
Co-Founder and President Jimini Health2023 - Present
Venture Builder Sanctum, Inc.2023 - Present
Venture Builder TVTAK2023 - Present
Venture Builder Sleuth2023 - Present
Venture Builder Sleuth Inc2023 - Present
Advisor Sleuth2023 - Present
Co-Founder and President Stealth Company (Mark Jacobstein)2023 - Present
Co-Founder and President Stealth MentalHealthCo2023 - Present
Board Member Luminopia2018 - Present
Chief User Engagement Officer Guardant Health2015 - Present
Founder and Partner (de facto co-CEO) Small World Software1994 - Present
Founder and Partner (de facto co-CEO) IT CRUX Mobile Apps SolutionsPresent
CEO IT CRUX Mobile Apps SolutionsPresent
Entrepeneur in Residence IT CRUX Mobile Apps SolutionsPresent
EVP Corporate Development & Marketing IT CRUX Mobile Apps SolutionsPresent
Executive Business Advisor and stay-at-home dad IT CRUX Mobile Apps SolutionsPresent
Venture Builder IT CRUX Mobile Apps SolutionsPresent
SVP iXLPresent
CEO Small World SportsPresent
VP Wireless and iTV Sporting NewsPresent
Entrepeneur in Residence Advantage CapitalPresent
Visiting Partner South Park Commons2025 - 2026
Board Member Odin2020 - 2026
Venture Builder Second2024 - 2025
Co-founder and General Partner Near Horizon2023 - 2025
Executive Business Advisor and stay-at-home dad NewCo2023 - 2023
Executive Business Advisor and stay-at-home dad Numerous2023 - 2023
Executive Business Advisor and stay-at-home dad TVTAK2023 - 2023
Executive Business Advisor at Immunai Immunai2022 - 2023
Chief Business Officer Immunai2020 - 2022
Co-Chair Working Group on Data Access Biden Cancer Initiative2019 - 2019
Board Member Full Circle Fund2011 - 2017
Chief Sabbatical Officer Currently on sabbatical2013 - 2015
Chief Sabbatical Officer No longer on Sabbatical2013 - 2015
VP Product Management Qualcomm 2010 - 2013
VP Product Management Qualcomm2010 - 2013
CEO Qualcomm2007 - 2010
CEO iSkoot2007 - 2010
Entrepreneur in Residence CRV2007 - 2007
Entrepreneur in Residence Charles River Ventures2007 - 2007
EVP Corporate Development & Marketing NewCo2006 - 2007
EVP Corporate Development & Marketing TVTAK2006 - 2007
EVP Corporate Development & Marketing loopt, Inc.2006 - 2007
President of Publishing, co-Founder Digital Chocolate2003 - 2005
Entrepeneur in Residence NewCo2003 - 2003
Entrepeneur in Residence TVTAK2003 - 2003
VP Wireless and iTV PERFORM2001 - 2002
CEO NewCo1994 - 2002
CEO TVTAK1994 - 2002
SVP SapientRazorfish1998 - 2000
Founder and Partner (de facto co-CEO) NewCo1994 - 1998
Founder and Partner (de facto co-CEO) TVTAK1994 - 1998

Mark Jacobstein's Education

Harvard University B.A. Computer Science with Cognitive Science
Harvard University B.A. Computer Science with Cognitive Science, cum laude General Studies

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