| 2024-10-27 | Co. that introduced Dungeons & Dragons |
| 2017-10-19 | Co. that launched Dungeons & Dragons |
| 2015-11-05 | Original D&D co. |
| 2015-09-20 | Co. that originated Dungeons & Dragons |
| 2015-05-03 | Original Dungeons & Dragons game co. |
| 2015-04-18 | Original D&D co. |
| 2014-07-20 | Classic fantasy game co. |
| 2013-09-07 | Co. purchased by Wizards of the Coast |
| 2013-08-01 | Old D&D co. |
| 2013-07-12 | Co. that introduced Dungeons & Dragons |
| 2013-03-24 | Dungeons & Dragons co. |
| 2013-03-10 | Old Dungeons & Dragons co. |
| 2012-08-02 | Original Dungeons & Dragons co. |
| 2012-04-20 | Old game co. that made D&D |
| 2011-02-02 | Old Dungeons & Dragons co. |
| 2009-02-07 | Original Dungeons & Dragons co. |
| 2007-07-08 | Game co. that originated Dungeons & Dragons |
| 2005-03-17 | Longtime Dungeons & Dragons maker |
| 2004-07-31 | Dungeons & Dragons co., once |
| 2003-08-13 | Early Dungeons & Dragons co. |
| 2003-07-20 | Dungeons & Dragons game co. |
| 2003-06-01 | Game co. that originated Dungeons & Dragons |
| 2000-09-24 | Dungeons & Dragons game co. |