Alphabet tanks nearly 13% for worst day ever, losing $500 billion in value
Investors reacted to earnings and higher AI spending, with weak search-ad results adding pressure.
TL;DR
- Alphabet shares fell about 13% on October 29, their steepest one-day decline since the company began trading in 2004.
- Reuters and AP tied the drop to search-ad results and a sharp rise in cash spending as AI investment expanded.
- The market reaction reflects concern about spending and monetization; it does not resolve the longer-term returns from Alphabet's AI buildout.
Alphabet's shares fell nearly 13% on October 29, the steepest one-day decline in the company's trading history, CNBC reported. AP independently described the session as a historic drop and said the Class A shares fell 12.6%. [1] [2]
Reuters attributed the move to disappointing search-ad results and rising cash spending as AI-related investment accelerated. The report said Alphabet was on track to lose more than $500 billion in market value during the session, though market-value estimates change with the share price. [2] [3]
AP also reported that Alphabet's purchases of property and equipment exceeded $51 billion in the latest quarter and that the company burned through more cash under the free-cash-flow measure. The combination put attention on whether infrastructure spending will be matched by monetization. [2] [3]
The share move records investor repricing after results; it does not establish that the spending will fail to produce future revenue or productivity gains. How quickly AI-related costs translate into durable earnings, and whether search advertising stabilizes, remain open questions. [1] [2] [3]
Why it matters
Alphabet's decline illustrates how investors are weighing large AI infrastructure costs against near-term advertising performance. The same spending cycle is visible across other technology companies, but each company's revenue mix and investment returns differ.
Editor's note
Share-price move and causes are cross-checked with CNBC, AP and Reuters. The market-cap loss is presented as a reported intraday estimate, not a fixed figure.