Amplitude is trading 4.01% down at $16.50, with a broader software and technology selloff appearing to be the stronger explanation amid concerns that AI regulation could slow data-center construction and spending. - Third-quarter revenue was $110.6 million, up 25% year over year; the company also raised its full-year outlook. - Customers paying more than $100,000 annually rose 31% year over year to 855. - Earnings news was positive and did not provide a clear company-specific explanation for the decline.