Does anyone exactly what the issue here could be? I've checked the Yahoo data against my own broker data feeds along with CBOE and google, all of them contradict what Yahoo is showing. Here's an example. Yahoo: 35.00 NQ150117C00035000 1.32 0.00 1.20 1.80 2,000 4,243 CBOE: NQ1517A35-E 0.95 0.0 1.20 1.80 0 4243 Everything else is showing 0 for volume. Any ideas?