| Name | Ticker | Type | ISIN code |
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| O2MICRO INTERNATIONAL LIMITED ADR | OIIM | Stock | KYG6797E1061 |
| OAK RIDGE FINANCIAL SERVICES. | BKOR | Stock | US0641801024 |
| OBAGI MEDICAL PRODUCTS. | OMPI | Stock | |
| OCCAM NETWORKS, INC. | OCNW | Stock | US67457P3091 |
| OCCULOGIX, INC. | OCCX | Stock | US67461T1079 |
| OCEAN BIO-CHEM, INC. | OBCI | Stock | US6746311066 |
| OCEANFIRST FINANCIAL CORP. | OCFC | Stock | US6752341080 |
| OCEANFREIGHT INC. | OCNF | Stock | |
| OCEAN POWER TECHNOLOGIES. | OPTT | Stock | |
| OCEAN SHORE HOLDING CO. | OSHC | Stock | US67501P1075 |
| OCHARLEYS INC. | CHUX | Stock | US6708231039 |
| OCULUS INNOVATIVE SCIENCES. | OCLS | Stock | |
| ODYSSEY HEALTHCARE. | ODSY | Stock | US67611V1017 |
| ODYSSEY MARINE EXPLORATION. | OMEX | Stock | |
| OHIO LEGACY CORPORATION | OLCB | Stock | US6773991079 |
| OHIO VALLEY BANC CORP. | OVBC | Stock | US6777191064 |
| O. I. CORPORATION | OICO | Stock | US6708411052 |
| OLD DOMINION FREIGHT LINE. | ODFL | Stock | US6795801009 |
| OLD LINE BANCSHARES. | OLBK | Stock | US67984M1009 |
| OLD POINT FINANCIAL CORPORATION | OPOF | Stock | US6801941070 |
| OLD SECOND BANCORP. | OSBC | Stock | US6802771005 |
| OLD SECOND BANCORP. - 7.80% CUMULATIVE T | OSBCP | Stock | |
| OLYMPIC STEEL, INC. | ZEUS | Stock | US68162K1060 |
| OMEGA FLEX, INC. | OFLX | Stock | US6820951043 |
| OMEGA NAVIGATION ENTERPRISES. | ONAV | Stock | MHY6476R1053 |
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