New Oriental Education trades in New York under EDU and in Hong kong under 9901.
On 24 Nov 2021, it closed in HK at $17.90 ($2.30 HKD). It closed in New York at $2.29.
One ADR in New York is the same as 1 share in Hong Kong.
I conclude that the prices of EDU and 9901 track each other closely.
Tan Kin Lian