Hi, just wanted to contribute to the list:-

AMEX acceptance confirmed
- Parkson @ One Utama
- MPH @ One Utama
- Pasta Zanmai @ One Utama
- Tangs @ One Utama
- Padini Concept Store @ One Utama
- Starbucks Coffee @ One Utama

Did Not Accept My AMEX
- TGV @ One Utama
- Sushi Q @ Publika (cash only, no credit card accepted)
- Barlicious @ Publika (only accepts credit card for bill above RM50, even then, not sure if they accept AMEX)
- Sun Inns Hotel (accepted my Visa though)

Just started using AMEX so am very interested in the stores that accept AMEX. This thread is very helpful. Thank you to everyone who is compiling the list.

Edo Ichi Japanese Restaurant @ Solaris Dutamas / Publika

Does NOT accept AMEX, only Visa and Master