Greylock | Activity | F4

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F4/Greylock/Activity

Greylock Activity

Every public signal F4 has attached to this firm, with sources and cross-entity links.

Types

Time range

Investment

Greylock led the Series A in Antioch, a simulation platform for physical AI, enabling teams to develop, test and validate AI systems in high-fidelity simulation.

Antioch

Antioch Greylock

greylock.comSEP 8, 2026

SEP 8, 2026

Investment

Greylock co-led a $60M seed round in Oak, an AI-native identity operating system that governs every identity (human, machine, AI agent) across an organization.

Oak

Oak Greylock

greylock.comJUL 15, 2026

JUL 15, 2026

Team Change

Glenn Kelman, former Redfin CEO, joined Greylock as an Executive in Residence to work directly with founders on leadership development and company building.

Greylock

GreylockGreylock

greylock.comJUL 14, 2026

JUL 14, 2026

New Fund

Greylock announced Greylock 18, a new $1.5 billion early-stage venture fund focused on AI-first companies and category-defining founders.

Greylock

GreylockGreylock

greylock.comJUL 14, 2026

JUL 14, 2026

Investment

Greylock led the seed round in Niteshift, a full-stack cloud for coding agents that allows teams to run frontier and open-source coding agents inside fully configured dev environments.

Niteshift

Niteshift Greylock

greylock.comJUN 10, 2026

JUN 10, 2026

Investment

Led Altara's $7M seed round for AI infrastructure serving physical sciences companies.

Altara

Altara Greylock

greylock.comMAY 5, 2026

MAY 5, 2026

Team Change

Neiman Mathew joined Greylock as a partner focused on early-stage AI founders, joining from Amplify Partners.

Greylock

GreylockGreylock

greylock.comAPR 15, 2026

APR 15, 2026

3 investments· FEB 2026 – MAR 2026Show all

Investment

Led Axiamatic's $54M Series A for AI-driven enterprise transformation.

Axiamatic

Axiamatic Greylock

techfundingnews.comMAR 13, 2026

MAR 13, 2026

Investment

Greylock led a $45M seed round in Cylake, an AI-native cybersecurity platform for customers requiring total data sovereignty, founded by Nir Zuk (Palo Alto Networks founder).

Cylake

Cylake Greylock

greylock.comMAR 5, 2026

MAR 5, 2026

Investment

Participated in Cogent Security's $42M Series A for AI-powered vulnerability remediation platform.

Cogent Security

Cogent Security Greylock

fortune.comFEB 18, 2026

FEB 18, 2026

Team Change

Chang Li joined Greylock as Marketing Partner, bringing experience from Metronome and HashiCorp to help portfolio companies with marketing strategy.

Greylock

GreylockGreylock

greylock.comJAN 21, 2026

JAN 21, 2026

Exit

Portfolio company Chronosphere acquired by Palo Alto Networks.

Chronosphere

Chronosphere Greylock

linkedin.comNOV 20, 2025

NOV 20, 2025