Important concepts pre-market on July 31

English summary

### Important concepts pre-market on July 31 Time: 2026-07-31 08:54:29 Content: Streamline important concepts to save review time Liking friends please support the author, comment to communicate Today's news: Memory chips On July 31, overseas memory giants' stocks surged overnight: Micron +18.2%, SK Hynix +17%, SanDisk +26%, Western Digital +15%, Kioxia ADR up sharply; Samsung earnings confirm memory business profit growth significantly, shortage cycle extends to after 2027 Top 5 popularity: C ChangXin, GigaDevice, Demingli, Biwin Storage, Longsys A-share listed companies [Announcement positives] (July 30 evening - July 31 pre-market) Sanchuan Group: plans to repurchase 500M-1B yuan shares for employee stock ownership plan ｜ MLCC, electronic ceramics, consumer electronics Kaineng Health: actual controller proposes 25M-50M yuan repurchase ｜ water treatment, pension concept Saiyi Information: 30M-60...