| O'Brien Greene & Co. Inc | institutional manager | | 0 | 214 |
| O'Brien Wealth Partners LLC | institutional manager | | 0 | none on file |
| O'Connor Alternative Investments, LLC | institutional manager | | 0 | 43 |
| O'Neil Global Advisors, Inc. | institutional manager | | 0 | 184 |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC | institutional manager | | 0 | 3,068 |
| OAK ASSOCIATES FUNDS | fund registrant | | 0 | 2,446 |
| OAK ASSOCIATES LTD | institutional manager | | 0 | 144 |
| OAK FAMILY ADVISORS, LLC | institutional manager | | 0 | none on file |
| OAK HILL WEALTH ADVISORS, LLC | institutional manager | | 0 | 331 |
| OAK RIDGE INVESTMENTS LLC | institutional manager | | 0 | 74 |
| OAKMONT Corp | institutional manager | | 0 | 30 |
| OAKTREE CAPITAL MANAGEMENT LP | institutional manager | | 0 | 37 |
| OARSMAN CAPITAL, INC. | institutional manager | | 0 | 5,062 |
| Oasis Management Co Ltd. | institutional manager | | 0 | 72 |
| Obermeyer Wealth Partners | institutional manager | | 0 | 708 |
| OBERWEIS ASSET MANAGEMENT INC/ | institutional manager | | 0 | 165 |
| OBERWEIS FUNDS | fund registrant | | 7 | 4,717 |
| OCM MUTUAL FUND | fund registrant | | 0 | 244 |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AM | institutional manager | | 0 | none on file |
| Octagon Capital Advisors LP | institutional manager | | 0 | 40 |
| Octahedron Capital Management L.P. | institutional manager | | 0 | none on file |
| ODDO BHF ASSET MANAGEMENT SAS | institutional manager | | 0 | 347 |
| Oder Investment Management, LLC | institutional manager | | 0 | 152 |
| OFI INVEST ASSET MANAGEMENT | institutional manager | | 0 | 316 |
| OFS Enterprise LLC | institutional manager | | 0 | 141 |
| OKABENA INVESTMENT SERVICES INC | institutional manager | | 0 | 427 |
| OLD NATIONAL BANCORP | institutional manager | | 0 | 1,421 |
| OLD REPUBLIC INTERNATIONAL CORP | institutional manager | | 0 | 54 |
| OLD SECOND NATIONAL BANK OF AURORA | institutional manager | | 0 | 269 |
| Old Well Partners, LLC | institutional manager | | 0 | none on file |
| Old West Investment Management, LLC | institutional manager | | 0 | 175 |
| OLD WESTBURY FUNDS INC | fund registrant | | 4 | 43,479 |
| Oldfather Financial Services, LLC | institutional manager | | 0 | 17 |
| Oldfield Partners LLP | institutional manager | | 0 | 12 |
| Olympiad Research LP | institutional manager | | 0 | 1,303 |
| OMERS ADMINISTRATION Corp | institutional manager | | 0 | 730 |
| One Capital Management, LLC | institutional manager | | 0 | 729 |
| One Fin Capital Management LP | institutional manager | | 0 | 32 |
| One Madison Group LLC | institutional manager | | 0 | 27 |
| OneAscent Financial Services LLC | institutional manager | | 0 | none on file |
| OneAscent Investment Solutions LLC | institutional manager | | 0 | none on file |
| Onex Canada Asset Management Inc. | institutional manager | | 0 | 91 |
| ONTARIO TEACHERS PENSION PLAN BOARD | institutional manager | | 0 | 158 |
| Opaleye Management Inc. | institutional manager | | 0 | none on file |
| Opes Wealth Management LLC | institutional manager | | 0 | none on file |
| Ophir Asset Management Pty Ltd | institutional manager | | 0 | 24 |
| Oppenheimer & Close, LLC | institutional manager | | 0 | 35 |
| OPPENHEIMER & CO INC | institutional manager | | 0 | 1,869 |
| OPPENHEIMER ASSET MANAGEMENT INC. | institutional manager | | 0 | 2,083 |
| Optika Master Portfolio Ltd | institutional manager | | 0 | 48 |
| OPTIMUM FUND TRUST | fund registrant | | 5 | 16,554 |
| Opus Capital Group, LLC | institutional manager | | 0 | 306 |
| Orange Investment Advisors, Inc. | institutional manager | | 0 | 324 |
| ORBA Wealth Advisors, L.L.C. | institutional manager | | 0 | 211 |
| ORBIMED ADVISORS LLC | institutional manager | | 0 | 220 |
| Orbis Allan Gray Ltd | institutional manager | | 0 | 65 |
| Orca Investment Management, LLC | institutional manager | | 0 | 255 |
| Orca Wealth Management, LLC | institutional manager | | 0 | 259 |
| Orchard Capital Management, LLC | institutional manager | | 0 | 28 |
| Oregon Pacific Wealth Management, LLC | institutional manager | | 0 | 223 |
| OREGON PUBLIC EMPLOYEES RETIREMENT FUND | institutional manager | | 0 | 2,712 |
| Orgel Wealth Management, LLC | institutional manager | | 0 | 905 |
| Oribel Capital Management, LP | institutional manager | | 0 | 44 |
| Origin Asset Management LLP | institutional manager | | 0 | none on file |
| Orion Capital Management LLC | institutional manager | | 0 | 259 |
| Orion Porfolio Solutions, LLC | institutional manager | | 0 | 3,714 |
| Orion Portfolio Solutions, LLC | institutional manager | | 0 | none on file |
| ORLEANS CAPITAL MANAGEMENT CORP | institutional manager | | 0 | 86 |
| ORRSTOWN FINANCIAL SERVICES INC | institutional manager | | 0 | 357 |
| Orvieto Partners, L.P. | institutional manager | | 0 | 35 |
| OSBORNE PARTNERS CAPITAL MANAGEMENT, LLC | institutional manager | | 0 | 461 |
| OSLO PENSJONSFORSIKRING AS | institutional manager | | 0 | 429 |
| Osmosis Investment Management UK Ltd | institutional manager | | 0 | 422 |
| OSSIAM | institutional manager | | 0 | 534 |
| OSTERWEIS CAPITAL MANAGEMENT INC | institutional manager | | 0 | 263 |
| OSTRUM ASSET MANAGEMENT | institutional manager | | 0 | 571 |
| Outlook Wealth Advisors, LLC | institutional manager | | 0 | 783 |
| Overbrook Management Corp | institutional manager | | 0 | 123 |
| Owl Creek Asset Management, L.P. | institutional manager | | 0 | 28 |
| Ownership Capital B.V. | institutional manager | | 0 | none on file |
| Oxbow Advisors, LLC | institutional manager | | 0 | 58 |