Malaysia has a diverse financial sector that includes various types of financial institutions, serving both conventional and Islamic banking and financial services. Here is a list of some of the key financial institutions in Malaysia:

Commercial Banks:

- Malayan Banking Berhad (Maybank)
- CIMB Group Holdings Berhad
- Public Bank Berhad
- RHB Bank Berhad
- Hong Leong Bank Berhad
- AMMB Holdings Berhad (AmBank)
- Standard Chartered Bank Malaysia Berhad
- HSBC Bank Malaysia Berhad
- Citibank Berhad
- United Overseas Bank (Malaysia) Berhad
- OCBC Bank (Malaysia) Berhad

Islamic Banks:

- Bank Islam Malaysia Berhad
- CIMB Islamic Bank Berhad
- RHB Islamic Bank Berhad
- Maybank Islamic Berhad
- Hong Leong Islamic Bank Berhad
- Public Islamic Bank Berhad
- Kuwait Finance House (Malaysia) Berhad
- Al Rajhi Banking & Investment Corporation (Malaysia) Berhad
- Bank Muamalat Malaysia Berhad

Development Financial Institutions (DFIs):

- Bank Pembangunan Malaysia Berhad (BPMB)
- SME Bank
- Export-Import Bank of Malaysia Berhad (EXIM Bank)
- Agrobank

Investment Banks:

- CIMB Investment Bank Berhad
- Kenanga Investment Bank Berhad
- RHB Investment Bank Berhad
- AmInvestment Bank Berhad
- Affin Hwang Investment Bank Berhad
- Hong Leong Investment Bank Berhad

Insurance and Takaful Companies:

- Great Eastern Life Assurance (Malaysia) Berhad
- Prudential Assurance Malaysia Berhad
- Allianz Malaysia Berhad
- Sun Life Malaysia Assurance Berhad
- Takaful Malaysia Berhad
- Etiqa Insurance Berhad
- Zurich Insurance Malaysia Berhad
- Hong Leong Assurance Berhad
- AIA Malaysia
- Manulife Holdings Berhad

Stock Exchange:

- Bursa Malaysia Berhad (Malaysia's stock exchange)
- Asset Management Companies:

- Public Mutual Berhad
- CIMB-Principal Asset Management Berhad
- Kenanga Investors Berhad
- RHB Asset Management Sdn Bhd
- AmInvestment Services Berhad

Cooperative Banks and Credit Unions:

- Bank Rakyat
- Koperasi Jayadiri Malaysia Berhad (KOJADI)
- Koperasi Tentera Malaysia Berhad (KTMB)

Payment Service Providers:

- Various e-wallet providers and payment gateway companies, such as GrabPay, Touch 'n Go eWallet, Boost, and more.

Regulatory and Supervisory Bodies:

- Bank Negara Malaysia (Central Bank of Malaysia)
- Securities Commission Malaysia
- Malaysia Deposit Insurance Corporation (PIDM)

Please note that this list is not exhaustive, as Malaysia's financial sector is quite extensive, and there are many other financial institutions, including smaller banks, credit unions, and fintech companies, operating in the country. Additionally, the financial landscape may evolve over time with the emergence of new institutions and regulations.