| Titolo | % | Ultimo | Ora | Apertura | Minimo | Massimo | Volumi |
| O'Reilly Auto | INV. | 88,7 | 28/08/2025 | --- | --- | --- | --- |
| Occidental Petroleum | INV. | 38,57 | 08/09/2025 | --- | --- | --- | --- |
| Oesterreichische | INV. | 29,65 | 14/08/2025 | --- | --- | --- | --- |
| Officina Stellare | +1,26% | 16,1 | 09/09/2025 | 15,9 | 15,6 | 16,1 | 5.500 |
| Okta Inc | INV. | 77,98 | 08/09/2025 | --- | --- | --- | --- |
| Old Dominion | INV. | 126,95 | 03/09/2025 | --- | --- | --- | --- |
| Old National Bancorp | INV. | --- | --- | --- | --- | --- | --- |
| Olidata | -1,52% | 2,761 | 09/09/2025 | 2,765 | 2,761 | 2,8 | 29.677 |
| Ollie's Bargain Outlet Holdi | INV. | --- | --- | --- | --- | --- | --- |
| Omer | -2,36% | 4,56 | 09/09/2025 | 4,72 | 4,56 | 4,72 | 173 |
| Omnicom Group Inc | INV. | 66,18 | 28/08/2025 | --- | --- | --- | --- |
| OMV | -1,38% | 45,72 | 09/09/2025 | 47,68 | 45,72 | 47,68 | 122 |
| On Semiconductor | INV. | 42,3 | 05/09/2025 | --- | --- | --- | --- |
| Oneok | INV. | 61,03 | 08/09/2025 | --- | --- | --- | --- |
| Opendoor Technologies Inc | -10,82% | 5,324 | 09/09/2025 | 5,046 | 4,8 | 5,38 | 108.670 |
| Option Care Health Inc | INV. | --- | --- | --- | --- | --- | --- |
| Oracle | -1,51% | 202,6 | 09/09/2025 | 205,3 | 200 | 206,5 | 1.223 |
| Orange | -0,30% | 13,48 | 09/09/2025 | 13,485 | 13,48 | 13,485 | 2.300 |
| Organon & Co | INV. | 8,36 | 04/09/2025 | --- | --- | --- | --- |
| Orion Class B | INV. | 67,25 | 02/09/2025 | --- | --- | --- | --- |
| Orsero | -0,24% | 16,44 | 09/09/2025 | 16,48 | 16,32 | 16,72 | 40.742 |
| Osai Automation System | INV. | 0,382 | 05/06/2025 | --- | --- | --- | --- |
| Otis Worldwide | INV. | 75,48 | 18/08/2025 | --- | --- | --- | --- |
| Otofarma | +5,45% | 5,8 | 09/09/2025 | 5,5 | 5,5 | 5,8 | 6.000 |
| Outokumpu Oyj | INV. | 3,556 | 28/08/2025 | --- | --- | --- | --- |
| OVS | +0,54% | 4,09 | 09/09/2025 | 4,09 | 4,054 | 4,116 | 297.667 |