If Alibaba's S-order is under investigation, relevant information will generally be announced through official channels. As a listed company, Alibaba needs to comply with relevant laws and regulations and announce important information in a timely manner. In addition, the media may also report related news, and investors and observers in the market will also pay close attention, which will lead to certain market reactions.

Therefore, if you want to know whether Alibaba's S-order is under investigation, you can pay attention to official announcements and media reports, and pay attention to market trends to obtain relevant information.