According to their own site, 21,898,832 share are outstanding. All of it issued as common stock. As of 9 months ago, 14.7% (3,218,091) owned by Nexon Co., 9% (1,970,546) treasury shares (owned and held internally by NCSoft), 9.99% (2,188,000) owned by Taek jin Kim (ceo). The rest owned by others (76.3%, 16,710,195). A corporate raid is possible but very unlikely so long as the price remains too high. I doubt the company's assets are worth anywhere near the price/share.
As for voting rights, since none of this is preferred stock, it all (except for the treasury stocks) has voting rights.