Indicates type of security (ISITC spec)
| Code | Meaning | 
|---|---|
| BA | BANKERS_ACCEPTANCE | 
| 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_PLUS_AGENCY_DEBENTURE | 
| MF | MUTUAL_FUND | 
| MIO | MORTGAGE_INTEREST_ONLY | 
| MPO | MORTGAGE_PRINCIPLE_ONLY | 
| MPP | MORTGAGE_PRIVATE_PLACEMENT | 
| MPT | MISCELLANEOUS_PASSTHRU | 
| 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 |