| 5201 | ONEXF | ONEX CORPORATION | 1 | 0.2% | $18.7M | – | Q3 2006 |
| 5202 | XKEM | XECHEM INTL INC | 1 | 0.0% | $54K | – | Q2 2006 |
| 5203 | ONT | ON2 TECHNOLOGIES INC | 1 | 0.0% | $192K | – | Q4 2009 |
| 5204 | ONTF | ON24 INC | 1 | 0.1% | $249.0M | – | Q1 2023 |
| 5205 | ONVOXXXX | ORGANOVO HLDGS INC | 1 | 0.0% | $3.6M | – | Q4 2014 |
| 5206 | ONXS | ONYX SOFTWARE CORP | 1 | 0.0% | $128K | – | Q3 2003 |
| 5207 | OO | OAKLEY INC | 1 | 0.0% | $3.9M | – | Q4 2003 |
| 5208 | OOMA | OOMA INC | 1 | 0.0% | $2.4M | – | Q4 2022 |
| 5209 | OPB | OPUS BK IRVINE CALIF | 1 | 0.1% | $30.6M | – | Q1 2017 |
| 5210 | ARTG | D ART TECHNOLOGY GROUP INC | 1 | 0.1% | $9.9M | – | Q4 2010 |
| 5211 | ARTC | ARTHROCARE CORP | 1 | 0.3% | $14.2M | – | Q1 2008 |
| 5212 | ART | Artio Global/art | 1 | 0.1% | $3.4M | – | Q4 2012 |
| 5213 | OPST | OPT Sciences | 1 | 0.0% | $1.5M | – | Q2 2006 |
| 5214 | OPSW | D OPSWARE INC COMMON | 1 | 0.5% | $19.3M | – | Q2 2005 |
| 5215 | OPTI | SCIENTIFIC INC OPTI INC | 1 | 0.3% | $12.3M | – | Q1 2003 |
| 5216 | OPTR | OPTIMER PHARMACEUTICALS INC | 1 | 0.0% | $2.0M | – | Q3 2013 |
| 5217 | ARS | ALERIS INTERNATIONAL INC | 1 | 0.1% | $74.0M | – | Q3 2006 |
| 5218 | ORAGFXXXX | OREMEX RESOURCES INC | 1 | 0.0% | $7K | – | Q1 2008 |
| 5219 | ORBC | ORBCOMM INC | 1 | 0.9% | $19.8M | – | Q1 2007 |
| 5220 | ORBS | EIGHTCO HOLDINGS INC | 1 | 0.0% | $100K | – | Q3 2025 |
| 5221 | ORC | ORCHID ISLAND CAPITAL INC | 1 | 0.0% | $77K | $6.97 | Q2 2025 |
| 5222 | ORCT | D ORCKIT COMMUNICATIONS INC COMMON | 1 | 0.6% | $21.3M | – | Q2 2006 |
| 5223 | OREO | AMERICAN LIBERTY PETROL CO | 1 | 0.0% | $1K | – | Q4 2012 |
| 5224 | OREXXXXX | D OREXIGEN THERAPEUTICS INC | 1 | 0.0% | $3.6M | – | Q2 2010 |
| 5225 | ORGC | ORGANIC ALLIANCE INC | 1 | – | $0 | – | Q3 2022 |
| 5226 | ORGO | ORGANOGENESIS HLDGS INC | 1 | 0.0% | $1.5M | – | Q4 2022 |
| 5227 | ORGOW | ORGANOGENESIS HLDGS INC | 1 | 0.0% | $107K | – | Q4 2018 |
| 5228 | ARRXXXX | ARMOUR RESIDENTIAL REIT INC | 1 | 0.0% | $1.3M | – | Q1 2014 |
| 5229 | ARRSXXXX | ARRIS GROUP INC NEW | 1 | 0.1% | $630.6M | – | Q3 2013 |
| 5230 | ORTX | ORCHARD THERAPEUTICS PLC | 1 | 0.1% | $74.6M | – | Q2 2020 |
| 5231 | ORXXXX | OSISKO GOLD ROYALTIES LTD | 1 | 0.1% | $291.9M | – | Q3 2018 |
| 5232 | OSCIQ | OSCIENT PHARMACEUTICALS CORP | 1 | 0.0% | $14K | – | Q1 2009 |
| 5233 | ARQL | D ARQULE INC | 1 | 0.1% | $886.5M | – | Q2 2019 |
| 5234 | OSH | OAK STR HEALTH INC | 1 | 0.0% | $7.6M | – | Q4 2021 |
| 5235 | OSHWQ | ORCHARD SUPPLY HARDWARE STORES | 1 | 0.1% | $41.7M | – | Q1 2013 |
| 5236 | OSIR | OSIRIS THERAPEUTICS INC NEW | 1 | 0.0% | $1.8M | – | Q4 2016 |
| 5237 | ARQ | ARQ INC | 1 | 0.0% | $1.2M | – | Q3 2025 |
| 5238 | ARPO | AERPIO PHARMACEUTICALS INC | 1 | 0.1% | $1.3M | – | Q1 2021 |
| 5239 | OTL | OCTEL CORP | 1 | 6.8% | $124.2M | – | Q1 2002 |
| 5240 | OTLK | OUTLOOK THERAPEUTICS INC | 1 | 0.0% | $14K | – | Q1 2023 |
| 5241 | OTRK | ONTRAK INC | 1 | 0.5% | $115.0M | – | Q4 2020 |
| 5242 | OUST | OUSTER INC | 1 | 0.1% | $2.8M | – | Q1 2025 |
| 5243 | OVAS | OVASCIENCE INC | 1 | 0.3% | $77.8M | – | Q3 2016 |
| 5244 | OVEN | D TURBOCHEF TECHNOLOGIES INC COMMON | 1 | 0.2% | $5.2M | – | Q3 2005 |
| 5245 | ARPJQ | D ATLAS RESOURCE PARTNERS LP COM UNT LTD | 1 | 0.0% | $7.6M | – | Q3 2012 |
| 5246 | ARPI | American Residential Properties, Inc. | 1 | 0.0% | $74.5M | – | Q4 2015 |
| 5247 | OXSQ | OXFORD SQUARE CAP CORP | 1 | 0.0% | $36K | – | Q4 2020 |
| 5248 | ABBC | ABINGTON BANCORP INC | 1 | 0.1% | $2.3M | – | Q3 2011 |
| 5249 | OZON | OZON HLDGS PLC | 1 | 0.4% | $798.4M | – | Q1 2023 |
| 5250 | P105PS | INTEGRYS ENERGY GROUP INC | 1 | 0.0% | $2.0M | – | Q4 2008 |