Normal retail shareholders have no such access to these sales numbers. Even the largest shareholders are not automatically given access to confidential information like this. They may request those sales numbers but the companies are not obligated to give out those specific sales numbers. The biggest shareholders in most large public companies are almost always some large investment firm and most of these guys probably subscribe to NPD's numbers anyhow.
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Normal retail shareholders have no such access to these sales numbers. Even the largest shareholders are not automatically given access to confidential information like this. They may request those sales numbers but the companies are not obligated to give out those specific sales numbers. The biggest shareholders in most large public companies are almost always some large investment firm and most of these guys probably subscribe to NPD's numbers anyhow.