Fastly is trading 4.62% lower at $28.28 after-hours amid broader risk-off pressure. - It closed September 23, 2026, at $29.65, after gaining 13.69% during regular trading. - No confirmed company-specific catalyst was identified; U.S. stocks fell, Treasury yields reached multi-year highs, and investors reassessed rate expectations. - Fastly’s September 22 Investor Day targets and AI-security launches remain recent context but do not directly explain the decline.