Why do stocks sometimes have spikes after hours? - Quora
https://www.quora.com/Why-do-stocks-sometimes-have-spikes-after-hours
After-hours trading volume in specific stocks often surges upon the occurrence of market-moving events, such as earnings reports, pre-earnings announcements or M&A activity. Lower liquidity and wider bid-ask spreads are a common feature of after-hours trading. However, investors may consider this a small price to pay for the privilege of exiting a losing position before regular …
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