Here is a list of the 25 largest Southeast Asian banks ranked by total assets. The 5 largest banks include three Singaporean and two Malayan financial institutions.

Rank Bank Country Total Assets, US$b (December 31, 2018)
1 DBS Group Holdings Singapore 402.895
2 Oversea-Chinese Banking Corp (OCBC) Singapore 342.027
3 United Overseas Bank Singapore 283.820
4 Maybank Malaysia 194.199
5 CIMB Malaysia 128.526
6 Public Bank Berhad Malaysia 100.997
7 Siam Commercial Bank Thailand 97.490
8 Kasikornbank Thailand 96.504
9 Bangkok Bank Thailand 95.331
10 Bank Rakyat Indonesia Indonesia 89.041
11 Krung Thai Bank Thailand 83.933
12 Bank Mandiri Indonesia 82.553
13 Bank of Ayudhya (Krungsri) Thailand 66.484
14 RHB Bank Malaysia 58.477
15 BDO Unibank Philippines 57.323
16 Bank Central Asia Indonesia 56.628
17 Bank Negara Indonesia Indonesia 55.514
18 BIDV Vietnam 54.665
19 VietinBank Vietnam 50.179
20 Hong Leong Bank Malaysia 48.825
21 Vietcombank Vietnam 46.242
22 Metropolitan Bank and Trust Company Philippines 42.552
23 Bank of the Philippine Islands Philippines 39.551
24 AmBank Malaysia 33.180
25 Thanachart Bank Thailand 32.012
26 TMB Bank Thailand 27.338