The split, announced in August, will take effect Dec. 5, said spokeswoman Elizabeth McNichols.
Sun's stock has been generally rising as the Unix server seller has reported ever-increasing sales despite hard times for Internet customers. The company had $5 billion revenue in each of its two most recent quarters.
Sun's stock, however, didn't fare so well Wednesday, dropping $11.13, or 10 percent, to $100.31. The Palo Alto, Calif.-based company hit its all-time high of $129.31 about two months ago.
After the split, Sun will double its total number of common shares to 7.2 billion, of which about 3.2 billion will be outstanding.