Type-Moon (タイプムーン Taipu Mūn) is a prominent Japanese game company, best known for their visual novels, co-founded by author Kinoko Nasu and illustrator Takashi Takeuchi. It is also known under the name Notes Co., Ltd. (有限会社ノーツ Yūgen-kaisha Nōtsu) for its publishing and corporate operations. After creating the immensely popular visual novel Tsukihime as a dojin soft organization, Type-Moon has since incorporated and produced the also popular visual novel Fate/stay night. Both of their works have been adapted into anime and manga series that have amassed a global fanbase.
Source: Wikipedia, "Type-Moon", available under the CC-BY-SA License.