Most likely a typo. There's only 2 occurrences in Google for "Quotas Referenciais" and it's separated by a comma and quite different than your context:

https://www.google.com.br/search?q="Quotas Referenciais"&rlz...

https://en.wikipedia.org/wiki/Preferred_stock
Preferred stock (also called preferred shares, preference shares or simply preferreds) is a type of stock which may have any combination of features not possessed by common stock including properties of both an equity and a debt instrument, and is generally considered a hybrid instrument. Preferred stocks are senior (i.e., higher ranking) to common stock, but subordinate to bonds in terms of claim (or rights to their share of the assets of the company)[1] and may have priority over common stock (ordinary shares) in the payment of dividends and upon liquidation. Terms of the preferred stock are described in the articles of association.

Employees subject to variable compensation are not necessarily shareholders. They have a participation ratio according to the criteria set forth by the company.