Greylock Partners filed SEC Form D notices for Greylock 18 on June 9, five weeks before publicly announcing the $1.5 billion early-stage AI fund. The firm deliberately capped the raise below LP demand to preserve its concentrated, hands-on investing model of roughly 25 companies per fund.

Greylock Partners filed two SEC Form D notices for its newest vehicle on June 9, 2026 — five weeks before the firm went public with the news. The fund, named Greylock 18, is reported at $1.5 billion per TechCrunch and the Silicon Valley Business Journal, targeting early-stage AI-native startups across infrastructure, cybersecurity, applications, and deep tech.

The two legal entities — Greylock 18 Limited Partnership (accession 0002136563-26-000001) and Greylock 18-A Limited Partnership (accession 0002136559-26-000001), both registered in San Francisco — hit EDGAR on June 9. When General Partner Saam Motamedi spoke publicly on July 15, he told TechCrunch that LP demand could have supported "a multiple of $1.5 billion." Greylock capped it anyway. The firm's model: 10 partners, each making one to two new investments per year, targeting roughly 25 portfolio companies from the fund. "We're getting to know people even before they start a company," Motamedi told TechCrunch. "It's really a bet on the person. Often the company doesn't even exist."

About 15 percent of the fund is reserved for follow-on investments in existing Greylock positions — Anthropic, Revolut, and Wiz among them, per the firm. The comparison point is Greylock 17, a $1 billion fund raised in 2023 with over 80 percent deployed at pre-seed, seed, or Series A per TechCrunch's prior coverage. Greylock 18 is a 50 percent step-up in capital; the number of portfolio companies stays roughly the same, meaning larger checks, not more doors.

For Bay Area founders, the door is no wider — just better funded once you're through it. The next indicator to watch is Form D filings from portfolio companies naming Greylock 18 LP as a security holder. Those will show where the capital is actually going before any press release arrives.