In some cases, the purchase with kickback may be tolerated or acquiesced by the company leaders, because kickback may be regarded as a "hidden rule", which is widespread in some industries and companies. In addition, some company leaders may also benefit from purchasing personnel, thus acquiescing in the behavior of purchasing personnel taking kickbacks.
But in other cases, the company leaders may realize that the behavior of taking purchasing kickbacks will not be tolerated, because such behavior may cause losses to the company and affect its reputation and interests.
In a word, whether the purchasing commission is known by the company leaders depends on the specific situation and the company's culture and management system. But in any case, it is immoral and illegal to take kickbacks from procurement, which may damage the interests and reputation of the company.