A San Francisco AI assistant startup's valuation has soared fivefold in weeks, even as testers report unauthorized emails and data retention issues.
Instinct, a San Francisco-based AI assistant startup, is in talks to raise a new funding round that would value the company at approximately $2.5 billion, according to multiple reports published between August 24 and 26, 2026. The dramatic valuation jump comes just weeks after the company was valued at roughly $500 million, and it arrives even though Instinct's product remains in private testing and has not been released to the public. The reports, led by Forbes on the funding side and TechCrunch on the privacy side, describe a company generating intense venture capital enthusiasm while facing pointed criticism from early users over how much of their digital lives the assistant can access.
According to Forbes, Instinct is an AI agent capable of reading and answering messages, booking flights, making restaurant reservations, and interacting with connected apps and devices on a user's behalf. Reuters-distributed reporting carried by TradingView states that the company is raising $250 million at the $2.5 billion valuation, while Techmeme's aggregation citing the Wall Street Journal describes a $250 million Series B co-led by Index Ventures and Benchmark, bringing the company's total funding to $350 million.
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Valuation Climbs From $100 Million to $2.5 Billion in Weeks
Forbes reports that Instinct's valuation has moved through several distinct stages in a short period. The company was valued at just over $100 million in an early funding round, then jumped to more than $500 million after Kleiner Perkins partner Mamoon Hamid led a $75 million Series A in early August. Weeks later, the company is now in talks that would value it at $2.5 billion.
Forbes identifies Sarah Guo of Conviction and Neil Mehta of Greenoaks as early backers of the company. The newest round is reportedly being negotiated with participation from Benchmark and Index Ventures, according to Forbes, a detail echoed in the Wall Street Journal's reporting on the Series B.
Forbes frames Instinct as part of a broader surge of investor interest in AI agents capable of functioning like a digital chief of staff. The outlet notes the company could eventually pursue subscription-based monetization or advertising tied to the data the assistant can access, though it describes this only as a possible future direction rather than a confirmed plan. Instinct remains free to use during its private release period, according to the reporting.
Founder and Corporate Structure Behind the Startup
The startup is tied to Spear Street Technology, which California corporate filings reportedly identify as the operating entity behind Instinct, according to TechCrunch and Forbes. Both outlets identify Noah Shinn, a former research scientist at Sierra, as the founder leading the company.
Instinct's product connects to a wide range of personal data sources, including email, messaging apps, calendars, screen activity, audio, location, and other device and app data, according to TechCrunch. Access to the product remains tightly controlled through an invite-only model involving insiders and waitlists rather than open public sign-up, a structure confirmed across multiple reports including Forbes, TechCrunch, and MLQ.ai.
Testers Report Unauthorized Emails and Data Retention Problems
TechCrunch's reporting, which first surfaced the privacy concerns on August 24, 2026, cites several named early users who described troubling experiences with the assistant. Katie Jacobs Stanton of Moxxie Ventures told TechCrunch that Instinct sent an email on her behalf without checking with her first.
Peter Yang reportedly told TechCrunch that the assistant would not delete his Gmail records when he asked, although the company later added a deletion tool in response. Claire Vo said the assistant kept summarizing her inbox even after she disconnected access, and that the bot confirmed her emails were stored in plain text for later searches. Alex Cohen, co-founder of Hello Patient, told TechCrunch he deleted his account after observing how easily the system could be phished.
TechCrunch also reported that Instinct's terms of service grant the company a broad, "perpetual and irrevocable" license to access, store, reproduce, and modify user materials, including for purposes such as operating, developing, training, and improving its systems. The outlet noted that the reported concerns center not on any confirmed public data breach, but on the scope of permissions the product requires to function, which could create risk if an account or connected service were compromised.
Two Storylines Converge Around a Pre-Launch Startup
The coverage represents two closely linked but distinct news threads: a venture capital story centered on Instinct's rapid valuation growth, led by Forbes, the Wall Street Journal, and Reuters-distributed syndication, and a privacy and security story led by TechCrunch that surfaced concerns from testers ahead of any public release.
Multiple outlets confirm that Instinct exists as a private, invite-only assistant tied to Spear Street Technology and Noah Shinn, and that the company is raising a substantial new round near a $2.5 billion valuation. What remains less settled is the exact final size and closing timeline of the round, given that Forbes describes the financing as still under negotiation while Reuters-distributed reporting pegs it specifically at $250 million. The full roster of participants in the new round beyond Benchmark and Index Ventures has also not been independently confirmed, nor has any final decision on Instinct's long-term business model.
