| Abbreviation | Definition |
|---|---|
| NMPI | Non-Mainstream Pooled Investment |
| NMTM | Never Mind the Markets |
| NNFI | National Nest Of Foreign Investment |
| NRI | Natural Resource Investments |
| NRIC | Natural Resource Investment Center |
| NSDL | National Securities Depositary Limited |
| NSIA | Nigeria Sovereign Investment Authority |
| NSIG | Nevada Sports Investment Group |
| NSIG | Northern Social Investment Group |
| NSIM | National Specialist Investment Management |
| NSPI | Nicholas Scott Property Investments |
| NTGI | Northern Trust Global Investments |
| NTIU | Nigeria Trade and Investment Union |
| NVCC | Non-Viability Contingent Capital |
| O | Offer |
| OAIJ | Oscar Auliq-Ice Junior |
| OBC | Online Borrow Capital |
| OBOI | Office of the Board of Investment (Thailand) |
| OCA | Object of Competitor Analysis |
| OCFDA | Offshore Commodity Futures Dealers Association |