Snehal Antani spent two decades preparing to found Horizon3. Investors put it above $2B

Why it matters

Horizon3's rise is a useful correction to the young-founder myth: Antani's domain experience supplied the product thesis, founding team and crisis judgment investors later funded.

Snehal Antani (@snehalantani) spent nearly two decades preparing to become a founder before Horizon3 announced a $250 million Series E on August 3, 2026 at a private valuation above $2 billion. The financing, co-led by NightDragon and NEA, was announced approximately seven years after Antani and Air Force veteran Anthony Pillitiere founded the cybersecurity developer in 2019.

The round itself is a month old. A Business Insider profile published September 5th supplies the more useful story behind it: Antani, now 46, treated his career at IBM, GE Capital, Splunk and the U.S. Joint Special Operations Command as an extended founder apprenticeship. Those stops gave him experience shipping products, managing organizations, scaling enterprise software and leading through crises before he started Horizon3 in his late 30s.

That preparation shaped both the product and the founding team. Antani met Pillitiere at JSOC, where Antani served as its first chief technology officer and Pillitiere worked as a deputy CTO within U.S. Special Operations. Horizon3's early ranks drew heavily from people the founders knew in intelligence, special operations and enterprise software.

Their product, NodeZero, autonomously attacks a customer's own production environment to identify exploitable paths through weak credentials, misconfigurations, vulnerable systems and identity gaps. It then prioritizes fixes and retests the environment. Antani's founding thesis came from years spent buying and operating security products without a reliable way to prove whether the defenses worked.

A career assembled for the founder job

Antani earned a bachelor's degree in computer science from Purdue University in 2002 and a master's degree in computer science from Rensselaer Polytechnic Institute. Purdue, which named him a distinguished alumnus in 2023, credits him with 18 U.S. patents.

His career moved deliberately across different parts of enterprise technology. Antani started as a software engineer at IBM, later held several CIO roles at GE Capital and became CTO and senior vice president at Splunk. He then joined JSOC, working on data analytics, cloud and edge computing, and cybersecurity initiatives.

An earlier SignalFire account of Horizon3's founding adds another layer to that progression. Antani said he moved closer to sales and customers at Splunk because he already knew how to build products and needed to learn how buyers made decisions. He joined JSOC partly to deepen his engineering network, later recruiting people with experience operating in environments where security failures carried immediate consequences.

The long runway runs against venture capital's enduring fascination with precocious founders. The data has long challenged that stereotype. A study of 2.7 million U.S. entrepreneurs found that the mean founder age for the fastest-growing 0.1% of new ventures was 45, while industry experience strongly predicted success.

Antani had accumulated that experience. He still had to learn fundraising in public.

The missing skill was selling the company

Antani told Business Insider that his first investor meetings became a crash course. He repeatedly revised Horizon3's deck, financial model and market argument around investors' questions.

"The first time, you kind of suck," Antani said. "You have to invest in being a good storyteller."

After dozens of meetings, Horizon3 received two term sheets and selected SignalFire to lead a $3.5 million seed round. The choice began a relationship that continued through later financings.

Horizon3 raised a $100 million Series D led by NEA in 2025. That round valued Horizon3 at $650 million, according to Horizon3's subsequent financing announcement. The Series E more than tripled that private valuation.

NightDragon and NEA co-led the Series E. New investors included Acrew Capital, Blue Cloud Ventures, Demeter Group, EDBI, PSG, SAIC and Sapphire Ventures. Craft Ventures, Prosperity7 Ventures, Qualcomm Ventures, Ridge Ventures and SignalFire returned. NightDragon founder Dave DeWalt and managing director Morgan Kyauk joined Horizon3's board.

Horizon3 said the money will support sales and channel expansion, entry into Singapore and Australia, further growth in Europe, and development of defensive agents that can remediate issues found by NodeZero. That last piece expands Antani's original penetration-testing wedge into a broader system in which automated attackers find weaknesses and automated defenders close them.

Preparation met two crises

The operating lessons arrived before the $2 billion valuation did. When technology funding tightened in 2022, Horizon3 needed to extend its cash runway. Antani told Business Insider that Horizon3 identified about $3 million in expenses to cut or redirect, including benefits, hiring plans and other operating costs.

Horizon3 moved that money into sales and marketing. Antani said the decision helped revenue grow nearly fivefold year over year. The company later approached $100 million in annual recurring revenue in 2025 and reported 120% year-over-year ARR growth in 2026, according to TechCrunch.

The next crisis was sharper. When Silicon Valley Bank collapsed in March 2023, Antani said Horizon3 held 100% of its cash there. Horizon3 had opened an account elsewhere by the time regulators took over SVB, but its money remained temporarily frozen.

Antani told Business Insider that missing payroll could have exposed Horizon3 to roughly $750,000 in daily California penalties, enough to exhaust the business within a week. He drew $1 million from a personal line of credit while Horizon3's executives explained the situation to employees. Horizon3 repaid him after regulators restored access to its SVB deposits.

"It's all about being steady, calm, controlled," Antani said of the leadership lesson he carried from JSOC. "You can't be panicked."

The valuation raises the execution burden

Horizon3 says NodeZero has completed 310,000 production tests for more than 7,000 customers, including four Fortune 10 companies. Although Horizon3 approached $100 million in ARR in 2025 and reported 120% year-over-year ARR growth in 2026, it has not disclosed profitability or pricing. Business Insider reported that Horizon3 employs about 550 people.

Those gaps matter at a valuation above $2 billion. Investors are underwriting Horizon3's claim that its production attack data will improve NodeZero and become difficult for newer autonomous-security products to reproduce. Acrew Capital, one of the new investors, described the accumulated testing data as Horizon3's strongest barrier against competitors relying on public data or general-purpose models.

The financing also raises the execution burden. Horizon3 must expand internationally, increase sales capacity and move into automated remediation while preserving the trust required to let NodeZero attack sensitive production systems. Antani spent his pre-founder career learning the individual parts of that job. The Series E pays him to prove they fit together at scale.