| Titolo | % | Ultimo | Ora | Apertura | Minimo | Massimo | Volumi |
| O'Reilly Auto | INV. | 76,04 | 27/06/2025 | --- | --- | --- | --- |
| Occidental Petroleum | -0,28% | 37,405 | 13:34 | 37,435 | 37,405 | 37,805 | 408 |
| Oesterreichische | INV. | 30,45 | 07/04/2025 | --- | --- | --- | --- |
| Officina Stellare | -1,33% | 14,8 | 12:29 | 14,9 | 14,8 | 14,9 | 1.000 |
| Okta Inc | INV. | 79,01 | 15/07/2025 | --- | --- | --- | --- |
| Old Dominion | INV. | --- | --- | --- | --- | --- | --- |
| Old National Bancorp | INV. | --- | --- | --- | --- | --- | --- |
| Olidata | +5,00% | 2,72 | 14:24 | 2,65 | 2,64 | 2,73 | 359.981 |
| Ollie's Bargain Outlet Holdi | INV. | --- | --- | --- | --- | --- | --- |
| Omer | -1,88% | 4,71 | 9:56 | 4,79 | 4,71 | 4,8 | 2.134 |
| Omnicom Group Inc | INV. | 62,5 | 16/07/2025 | --- | --- | --- | --- |
| OMV | INV. | 45,62 | 17/07/2025 | --- | --- | --- | --- |
| On Semiconductor | +2,62% | 52,04 | 10:00 | 52,04 | 52,04 | 52,04 | 8 |
| Oneok | INV. | 68,14 | 07/07/2025 | --- | --- | --- | --- |
| Opendoor Technologies Inc | +36,55% | 2,55 | 13:30 | 2,4 | 2,35 | 2,55 | 8.748 |
| Option Care Health Inc | INV. | --- | --- | --- | --- | --- | --- |
| Oracle | +0,45% | 211,8 | 14:30 | 211,9 | 211,4 | 213,1 | 481 |
| Orange | -0,61% | 13,135 | 13:11 | 13,11 | 13,11 | 13,135 | 1.055 |
| Organon & Co | INV. | 8,586 | 02/07/2025 | --- | --- | --- | --- |
| Orion Class B | INV. | 60,6 | 03/06/2025 | --- | --- | --- | --- |
| Orsero | +0,14% | 13,84 | 14:12 | 13,82 | 13,8 | 13,98 | 10.655 |
| Osai Automation System | INV. | 0,382 | 05/06/2025 | --- | --- | --- | --- |
| Otis Worldwide | INV. | 83,48 | 09/06/2025 | --- | --- | --- | --- |
| Outokumpu Oyj | INV. | --- | --- | --- | --- | --- | --- |
| OVS | -0,81% | 3,682 | 14:26 | 3,71 | 3,678 | 3,72 | 141.475 |