Indicates type of security (ISITC spec)
| Code | Meaning | 
|---|---|
| ? | Wildcard entry (used on Security Definition Request message) | 
| BA | Bankers Acceptance | 
| CB | Convertible Bond (Note not part of ISITC spec) | 
| CD | Certificate Of Deposit | 
| CMO | Collateralize Mortgage Obligation | 
| CORP | Corporate Bond | 
| CP | Commercial Paper | 
| CPP | Corporate Private Placement | 
| CS | Common Stock | 
| FHA | Federal Housing Authority | 
| FHL | Federal Home Loan | 
| FN | Federal National Mortgage Association | 
| FOR | Foreign Exchange Contract | 
| FUT | Future | 
| GN | Government National Mortgage Association | 
| GOVT | Treasuries + Agency Debenture | 
| IET | Mortgage IOETTE | 
| MF | Mutual Fund | 
| MIO | Mortgage Interest Only | 
| MPO | Mortgage Principal Only | 
| MPP | Mortgage Private Placement | 
| MPT | Miscellaneous Pass-Thru | 
| MUNI | Municipal Bond | 
| NONE | No ISITC Security Type | 
| OPT | Option | 
| PS | Preferred Stock | 
| RP | Repurchase Agreement | 
| RVRP | Reverse Repurchase Agreement | 
| SL | Student Loan Marketing Association | 
| TD | Time Deposit | 
| USTB | US Treasury Bill | 
| WAR | Warrant | 
| ZOO | Cats, Tigers & Lions (a real code: US Treasury Receipts) |