Russell Fradin
About Russell Fradin
Russell Fradin is the CEO and co-founder of Larridin, which describes itself as a measurement layer for enterprise AI. It tracks AI adoption, impact, fluency and developer productivity, and maps AI workflows across a business. Crunchbase lists Ameya Kanitkar as co-founder and CTO and Jim Larrison as another co-founder.
Before Larridin he was CEO and co-founder of Dynamic Signal, an employee communication and engagement platform, from October 2010 to January 2020. Wikipedia lists Fradin, Jim Larrison and Steve Heyman as its founders. He also co-founded and was CEO of Adify Corporation from October 2005 to April 2010. Adify was an online advertising company sold to Cox Enterprises. He was Vice Chairman of Carbon Health from February 2021 to January 2025.
Earlier roles were Executive Vice President of Corporate Development at comScore, Senior Vice President of Business Development at Wine.com, and Vice President of Business Development at Flycast Communications. NFX Signal dates these roles to 2000 to 2004, 2004 to 2005 and 1996 to 2000. He has served on the boards of comScore, TubeMogul and CoachArt, and previously on the boards of Udemy and Outside.in. He holds a B.S. in Economics from the Wharton School at the University of Pennsylvania.
Data providers count his investments differently. Crunchbase shows 22 investments, 22 portfolio companies, 10 exits (one by IPO) and no lead investments. NFX Signal lists 23 investments on record. PitchBook lists 12. Founders should treat these as partial views of a private angel portfolio.
NFX Signal and PitchBook dates show activity from the mid-2010s onward. Tracxn records Sprig (Series A, April 2015), SafeGraph (Series A, April 2017) and Carbon Health (Series A, May 2017). PitchBook records a 2019 seed investment in Improvado. NFX Signal lists LIT Videobooks (seed, July 2021), Scoop (seed, November 2022), Leanplum (Series D, February 2020) and Linear Labs (seed, March 2019). It also lists Hello Patient (seed, October 2024) and Pathfinder AI (seed, March 2026). Tracxn also records SocialShield, which was acquired in March 2012.
His main AI role is as an operator. He is CEO of Larridin, an enterprise AI measurement company. In a Business Insider interview, he said companies are not planning to cut AI spending but cannot raise it tenfold every year.
Among his angel investments, NFX Signal lists a March 2026 seed round in Pathfinder AI, a $4M round that also included Reach Capital, Eric Ries and Charlie Songhurst. I could not find public detail on what Pathfinder AI builds or how much he invested, so no further description is given here. I found no public statement of an AI-specific investment thesis.
NFX Signal shows an investment range of $5K to $50K with a sweet spot of $25K. This profile data may be self-reported and may be out of date. Fradin has not published a detailed thesis that I could find.
The companies on public records are mostly in business software, marketing and data, healthtech, financial software and consumer or creative software. Tracxn names Enterprise Applications and HealthTech as top sectors. Most listed investments are US companies at seed or Series A, with some later rounds such as Leanplum's Series D. His own operating experience is in digital media, measurement, advertising technology and enterprise software, so founders in those areas have the most direct overlap.
- Carbon Health: primary care and healthtech company. Tracxn records a Series A investment in May 2017, and he was later Vice Chairman from 2021 to 2025.
- SafeGraph: data company. Tracxn records a Series A in April 2017.
- Sprig: Tracxn records a Series A in April 2015.
- Leanplum: NFX Signal lists a Series D in February 2020.
- Scoop: business and productivity software. PitchBook shows deals in August 2019 and November 2022.
- Improvado: business software. PitchBook records a seed round in March 2019.
- Linear Labs: NFX Signal lists a seed round in March 2019.
- LIT Videobooks: NFX Signal lists a seed round in July 2021.
- Hello Patient: NFX Signal lists a seed round in October 2024.
- Pathfinder AI: NFX Signal lists a seed round in March 2026.
- crunchbase.com/person/russell-fradin
- signal.nfx.com/investors/russell-fradin
- pitchbook.com/profiles/investor/222630-67
- tracxn.com/d/people/russell-fradin/__MyZre5NET5rhbzQF64U50JmvoljzExSev
- tracxn.com/d/people/russell-fradin/__WemU-kGhSHuLjx12m5Aa9lgpHEfzbBDdx
- signal.nfx.com/investors/russ-fradin
- td.org/p/russ-fradin
- crunchbase.com/organization/larridin
Investing activity
Russell Fradin has made 22 investments according to Crunchbase across 22 portfolio companies, and has seen 10 exits, 1 of them by IPO and founded 4 companies.
Russell Fradin appears in 1 AI deal tracked by the Lounge deals desk. The rounds are mostly Seed, with a median round size of $4M. The most recent is Pathfinder AI (Seed, $4M, Mar 2026).
Russell Fradin most often invests alongside Reach Capital, Gradient Ventures, Charlie Songhurst and Amir Nathoo, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Russell Fradin
What check size does Russell Fradin write as an angel investor?
NFX Signal lists a range of $5K to $50K with a sweet spot of $25K. He has not published this himself that I could find, so confirm it directly.
What stage does Russell Fradin invest in?
Public records show mostly seed and Series A rounds. Some listed deals are later, such as Leanplum's Series D in 2020. Crunchbase shows no lead investments.
What sectors does Russell Fradin back?
Public data points to enterprise software, marketing and data, healthtech, financial software and creative or consumer software. Tracxn lists Enterprise Applications and HealthTech as top sectors.
What companies has Russell Fradin founded?
He co-founded Adify (sold to Cox Enterprises), Dynamic Signal and Larridin. Crunchbase counts 4 founded companies. SocialShield appears in his history as a chairman role, not a founding role.
Does Russell Fradin invest in AI startups?
He runs Larridin, an enterprise AI measurement company. NFX Signal lists a March 2026 seed investment in Pathfinder AI. His public record does not show a focused AI fund or stated AI thesis.
Where is Russell Fradin based?
Crunchbase lists San Francisco, California. NFX Signal places his investing in the San Francisco Bay Area.
Is Russell Fradin an angel investor?
Yes. Russell Fradin invests personally as an angel. Crunchbase counts 22 investments and 10 exits.
What AI companies has Russell Fradin invested in?
Russell Fradin's AI investments include Pathfinder AI. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Russell Fradin invest at?
In the rounds tracked on Lounge, Russell Fradin has invested at Seed, with a median round of $4M.
Who does Russell Fradin co-invest with?
Russell Fradin's most frequent co-investors on Lounge are Reach Capital (1 deal), Gradient Ventures (1 deal), Charlie Songhurst (1 deal), Amir Nathoo (1 deal) and Social Impact Ventures (1 deal).