- APY
- AR
- ARCH
- AQ
- AR
- ARS
- ARM
- ARPS
- ARPS
- ARR
- AS
- ASE
- ASX
- AT
- ATP
- ATS
- AU
- AUD
- AW
- AWG
- AZ
- AZM
- AAA+ Bank
- Abandonment
- Abandonment option
- ABC agreement
- Ability to pay
- Abnormal returns
- Above par
- Absolute advantage
- Absolute form of purchasing power parity
- Absolute Physical Life
- Absolute priority
- Absorbed
- Abusive tax shelter
- Accelerated cost recovery system (ACRS)
- Acceleration clause
- Accelerated depreciation
- Acceptance
- Accommodative monetary policy