LinkedIn threw its hat into the increasingly crowded initial-public-offering ring, announcing that it filed its registration statement with the Securities and Exchange Commission for its class-A common stock.

The professional networking site said it has not yet determined the number of shares to be offered, nor the price range, adding that a portion of the total would be sold by the company and a portion by certain LinkedIn stockholders.

The bookrunning managers of the proposed IPO will be Morgan Stanley, BofA Merrill Lynch, and J.P. Morgan Securities, with Allen & Co. and UBS Securities acting as co-managers.