The princely state of Jammu and Kashmir was comprised of Jammu region, Kashmir Valley, Ladakh, Gilgit, Baltistan and a bit of Aksai Chin.[1] So, India have Jammu, Ladakh and a part of Kashmir. Pakistan have POK (Azad Kashmir + Gilgit-Baltistan). And, China have Aksai Chin.

[1] https://en.wikipedia.org/wiki/Jammu_and_Kashmir_(princely_st...