Jake Seid

Somewhere between the dot-com crash and the AI arms race, Jake Seid made a decision most investors avoid: he narrowed down. While the venture industry sprinted toward every category simultaneously - fintech, climate, consumer, health, crypto, enterprise SaaS - Seid co-founded a fund with a single category on its letterhead. Cybersecurity. Nothing else.

Ballistic Ventures, which Seid launched in 2021 alongside Roger Thornton and a team of career security operators, has grown to over $700M in assets under management. It is, by design, undiluted. No platform team stretched across 15 sectors. No LP relations team explaining crypto to pension funds while also pitching cybersecurity. Just one thing, deeply.

The timing was deliberate. "We want to build an organization that outlives our useful lives," Seid has said. "One that partners with the best entrepreneurs solving the hardest problems in cybersecurity." He is not building to exit. He is building to endure.

Before the venture fund, before Auction.com, before even Lightspeed, Jake Seid was a product lead at Cisco doing something that sounds impossibly arcane but turned out to matter enormously: he helped write DOCSIS. The Data Over Cable Service Interface Specification is the technical standard that governs how broadband internet moves through coaxial cable. It is, in short, the protocol behind the internet connection in most American homes.

Seid arrived at MIT in the early 1990s and left in 1998 with two degrees - a Bachelor's in Electrical Engineering and a Master's in Electrical Engineering and Computer Science - and the Karl Taylor Compton Prize, the highest honor the institute gives to a student. It is awarded not merely for academic accomplishment but for service to the MIT community. He then briefly worked business development in Tokyo for Boston Technology before landing at a small startup unit inside Cisco.

What that team built scaled from a near-zero revenue run rate to $1 billion per year in just two years. From zero to 90% market share. In broadband infrastructure. In the late 1990s. The experience was formative in a specific way: it showed Seid what it felt like to ride a category before the category existed - and what it looked like when the technical moat actually held.

In 2000, at 24 years old, Jake Seid joined Weiss, Peck & Greer - one of the oldest venture firms in Silicon Valley - and helped spin it out into what became Lightspeed Venture Partners. He would spend the next eleven years there, eventually landing a seat on the Global Investment Committee as one of six Managing Directors. Lightspeed, in that era, was building the infrastructure for what the internet would become.

But Seid left Lightspeed in 2011 to do something that most investors avoid: he took an operating job. Not an advisory board slot. Not a part-time EIR. He became President of Ten-X, then known as Auction.com, the real-estate transactional marketplace. Eight hundred people reported into his organization. He built the platform into the industry's dominant player and shepherded it through a $1.6 billion acquisition by TH Lee Partners.

That detour into operations gave him something rare in venture: a live-fire calibration of what it actually costs to scale. The difference between a product demo and 800 people executing against a roadmap. Between a term sheet and a company that survives due diligence. That calibration informs how he works with Ballistic portfolio founders today.

After Auction.com, Seid did not go back to a large firm. He launched Stone Bridge Ventures - a solo operation, no marketing team, no support staff. Just his own conviction and capital, deployed early into companies that most institutional funds had not yet noticed. Twelve of those early bets became unicorns.

The Stone Bridge portfolio reads like a who's-who of the last decade's breakout software companies: Brex, Blend, Bolt, Abnormal Security, Carta, Cresta.ai, Drata, DataRobot, and others. Some of those names are now household words in enterprise SaaS. When Seid backed them, they were founder pitches.

The Stone Bridge years also shaped his thinking about what early-stage capital actually does. Not governance, not brand - capital as a forcing function. The first institutional check changes a company's trajectory. It signals something to the market. Seid had now seen both sides: the check-writer and the check-receiver. The pattern recognition that comes from standing at both ends of the table is not easily replicated.

Seid's investment thesis at Ballistic is not complicated, but it is specific. He sees the next decade as an AI-on-AI conflict: automated attack systems against automated defense systems, with humans increasingly in the supervisory loop rather than the operational one. Deepfakes that impersonate CEOs to authorize wire transfers. State-sponsored "sleeper cells" that embed themselves in corporate networks for years before activating. Autonomous agents that require their own identity and access management layer - a category he calls non-human identity.

Against that backdrop, Seid argues that yesterday's security tooling is structurally inadequate. The enterprise perimeter model was designed for a world where humans sat at fixed desks accessing known systems. That world ended. What replaces it needs to be designed with the assumption of breach, built to contain rather than merely prevent, and capable of reasoning about threats that move faster than human analysts.

Ballistic targets seed and Series A - often the first institutional check in. The investment range runs from $750,000 to $15 million, with a sweet spot around $7 million. They make six to eight investments per year. The fund's BallisticX platform layers cybersecurity-specific operational support - former Google and Goldman Sachs security leaders, the RSA CMO, a New York Times cybersecurity journalist - on top of the capital.