John Cowgill

Background

John Cowgill is a General Partner at Costanoa Ventures, a seed and Series A venture capital firm based in the San Francisco Bay Area ¹. He joined Costanoa in 2016 and was promoted to General Partner in September 2024 alongside the firm’s close of two new funds totaling $394 million ². Cowgill has built Costanoa’s cybersecurity and space investment practices and led investments in companies including AppOmni, Cyberhaven, Muon Space, and Kepler Communications ².

Prior to Costanoa, Cowgill was a Business Analyst at McKinsey & Company, where he advised technology and consumer companies on strategy ¹³. Before McKinsey, he worked in business development at Techweek, a national technology conference series ¹.

Cowgill holds a B.S. in Learning and Organizational Change with a concentration in Marketing and Economics from Northwestern University, graduating summa cum laude ³.

Costanoa Ventures manages over $2 billion in total assets across five early-stage funds and three opportunity funds, with the most recent being Fund V ($275 million) and Opportunity Fund III ($119 million), both closed in September 2024 ².

Stated Thesis

(Self-reported: These represent what Cowgill says publicly about his approach. See Inferred Thesis for analysis of actual investment behavior.)

Cowgill describes his focus as backing “early-stage teams building AI-native applications and the infrastructure that powers and protects them” ¹. He evaluates and leads investments in applied machine learning, marketplaces, security, and deep tech ¹.

On vertical SaaS specifically, Cowgill has stated his excitement about “vertical SaaS companies with applied data/ML components and opportunities to integrate financial services/payments at scale,” with particular interest in real estate, logistics, and heavy industry ³. He has argued that generative AI has unlocked vertical-specific opportunities previously considered too narrow, noting that “the knock on vertical SaaS has always been: it’s a smaller total addressable market because you limit yourself to one vertical, rather than building something that can apply to every vertical” ⁴.

Cowgill has stated he is “more bullish on AI native application layer companies than I was two years ago” and believes “the real value in AI comes when you can own an end-to-end workflow” ⁴.

On what he looks for in founders, Cowgill emphasizes three core attributes: grit paired with humility, velocity of execution, and integrity ⁵. He has described his ideal founder profile as combining “grit plus humility” with “domain expertise or curiosity-driven learning” ⁵.

His stated check size is $2 million to $5 million, with a sweet spot of $3.5 million ³.

Inferred Thesis

Based on 22 verified investments (see Portfolio below), Cowgill’s actual investment behavior reveals the following patterns:

Sector distribution: Cybersecurity is the dominant sector with 7 of 22 investments (32%): AppOmni, Cyberhaven, FOSSA, RunReveal, System Two Security, Empirical Security, and detections.ai. Space and defense tech account for 4 of 22 (18%): Muon Space, Kepler Communications, Vannevar Labs, and Auterion. Vertical SaaS represents 5 of 22 (23%): Vividly (CPG), Zentist (dental), Roadster (auto), Leap (retail), and Smile Identity (KYC/Africa). AI/ML infrastructure accounts for 4 of 22 (18%): Parallel Domain, OpenPipe, Delphina, and Definite. The remaining 2 of 22 (9%) are in travel tech (Mindtrip) and data/analytics (Novel).

Stage distribution: The vast majority of investments are at seed stage. Of the 22 verified investments, at least 15 appear to be seed-stage entries. Cowgill also participates in Series A rounds, both as lead and follow-on (e.g., FOSSA Series A, Kepler Series A, Smile Identity Series A, Zentist Series A).

Geographic patterns: The portfolio skews heavily toward the San Francisco Bay Area. Notable exceptions include Kepler Communications (Toronto, Canada), Smile Identity (Lagos, Nigeria/San Francisco), Leap (Chicago, IL), and Empirical Security (Chicago, IL).

Founder profile patterns: Cowgill shows a strong preference for founders with deep domain expertise. Several investments involve repeat founders or teams with prior exits: Empirical Security’s team previously built Kenna Security, and Vannevar Labs was incubated in Costanoa’s office by Stanford GSB students ²¹². He has stated he prioritizes founders who are “the experts” in their domain rather than forcing companies into predetermined theses ⁵.

Co-investor patterns: Frequent co-investors across Cowgill’s portfolio include Runtime Ventures and The Hive (cybersecurity deals), Ubiquity Ventures (deep tech), and General Catalyst (defense tech/Vannevar Labs).

Notable gap vs. stated thesis: Despite claiming interest in “marketplaces,” only 1-2 portfolio companies (Leap, possibly Roadster) fit a marketplace model. The portfolio is more accurately described as enterprise software and infrastructure-heavy, with cybersecurity and defense tech being the clearest differentiators from a generic seed fund.

Active investor signal: Cowgill’s most recent verified investment is Empirical Security’s $12 million seed round in July 2025 ¹², confirming he remains actively deploying from Costanoa’s Fund V.

Portfolio

This table represents approximately 22 verified investments. Signal NFX reports 30+ partner investments; this table captures roughly 73% of known deals ³.

In Their Own Words

“Threat detection today is broken – and AI is massively increasing the volume of threats teams need to manage.” – John Cowgill, on the System Two Security investment, GlobeNewsWire, December 2024 ²²

“For too many companies, existing SIEM products are too expensive, too difficult to implement and too hard to use.” – John Cowgill, on the RunReveal investment, SiliconANGLE, May 2024 ²¹

“We backed Ed, Michael, and Jay at Kenna, where they pioneered the risk-based vulnerability management movement. With Empirical, they’re doing it again – but replacing generic risk scores with local AI models that tailor scores to each enterprise. We’re thrilled to partner with them on what we believe is a 10x bigger opportunity to transform how security teams prioritize and act on risk.” – John Cowgill, on the Empirical Security investment, PR Newswire, July 2025 ¹²

“The knock on vertical SaaS has always been: it’s a smaller total addressable market because you limit yourself to one vertical, rather than building something that can apply to every vertical.” – John Cowgill, on vertical AI opportunities, Crunchbase News, 2024 ⁴

“The real value in AI comes when you can own an end-to-end workflow.” – John Cowgill, Crunchbase News, 2024 ⁴

“Costanoa is building the most founder-aligned early stage venture firm in the industry. I couldn’t be more excited…” – John Cowgill, on his promotion to General Partner, GlobeNewsWire, September 2024 ²

What Founders Say

“The Costanoa team feels like an extension of our team at this point, with a very different level of engagement than we see from other investors that is hyper specific to this early stage of company building. They are also just really great people who want to have a really big impact on the world, and we can’t imagine building Vannevar without them.” – Nini Hamrick, President & Co-Founder, Vannevar Labs, GlobeNewsWire, September 2024 ²

No additional independently sourced founder testimonials specifically about John Cowgill were found. The Vannevar Labs testimonial references the Costanoa team broadly, which includes Cowgill as a board member and lead investor in Vannevar Labs.

Connections

• Board Member, RunReveal (since 2023) ³
• Board Member, System Two Security (since 2024) ³
• Board Member, Empirical Security (since 2025) ³
• Board Member, Cyberhaven (since 2019) ³
• Board Member, Kepler Communications (since 2019) ³
• Board Member, Muon Space (since 2021) ³
• Board Member, FOSSA (since 2019) ³
• Board Member, Parallel Domain (since 2018) ³
• Board Member, Smile Identity (since 2021) ³
• Board Member, Vividly (since 2021) ³
• Board Member, Definite (since 2022) ³
• Board Member, Zentist (since 2020) ³
• Board Observer, AppOmni (since 2018) ³
• Board Observer, Novel ³
• Former Business Analyst, McKinsey & Company ¹
• Former Business Development, Techweek ¹
• Northwestern University, B.S. summa cum laude ³

Sources