William "Will" Cielen, a former magician’s assistant and ballet dancer, has raised $4.2 million in seed funding for his cybersecurity startup, Hilt. The round was led by Array Ventures, with participation from Verdict Capital, Base10 Partners, Brickyard, Liquid 2 Ventures, Sequel, the Sarah Smith Fund, and Alumni Ventures. This brings Hilt’s total funding to $4.7 million, including a $500,000 pre-seed round from Pear VC in October 2025.
Cielen, who grew up on a cruise ship and in Las Vegas before moving to Montreal at age 10, skipped two grades and started college early. After a hackathon in Waterloo, he dropped out, moved to San Francisco, and founded Hilt to solve a specific problem: detecting unusual data activity in high-frequency trading environments without introducing latency.
Hilt’s software monitors data movement across cloud infrastructure, computers, and networks by building behavioral baselines. It flags suspicious activity—such as a late-night login from an employee who typically works during the day—especially when combined with other anomalies like a recent password change. The system operates at the kernel level and streams data to graph neural networks, allowing it to alert security teams or quarantine threats in real time. A large hedge fund reportedly offered a contract worth $1 million to $2 million after a pivotal conversation about its security challenges.
Source: Crunchbase News · Summarized by HeadlinesBriefing