I'll verify this company's profile with a few searches.
ATI Technologies Inc. ("ATI") was a Canadian fabless semiconductor company based in Markham, Ontario, founded in August 1985 as Array Technology Inc. by K.Y. Ho, Benny Lau, Lee Ka Lau and Francis Lau. It went public in 1993 (TSX: ATY; Nasdaq: ATYT) and was acquired by Advanced Micro Devices (AMD) in a deal announced July 2006 and closed October 25, 2006, valued at roughly US$5.4–5.6 billion. AMD retained ATI Technologies as a subsidiary (now ATI Technologies ULC), and retired the ATI brand for graphics products in 2010. Reported figures at the time of the acquisition were approximately US$2.2 billion in revenue (2005) and about 2,700 employees (2004). It is therefore a subsidiary of a public company, not an independent issuer.
Operations. ATI was an operating company, not a shell or licensor: it designed graphics processors and chipsets in-house and outsourced fabrication. Product lines included the early Wonder and Mach 2D accelerators, the Rage 2D/3D family, the flagship Radeon desktop GPU line (launched 2000), Mobility Radeon notebook chips, FireGL/FirePro workstation graphics, Radeon Xpress integrated-graphics chipsets, All-in-Wonder multimedia cards and TV Wonder tuners, console GPUs (Flipper for GameCube, Hollywood for Wii, Xenos for Xbox 360), and Imageon handheld/mobile SoCs. Its patent portfolio combined internal R&D with acquisitions including Tseng Labs' graphics assets, ArtX and Terayon's cable-modem silicon IP.
Litigation posture. ATI does not fit the NPE profile: the tracked data show zero defendant-side cases and one plaintiff-side case, in a patent-office forum rather than district court. That solitary appearance is as a co-plaintiff alongside AMD — the semiconductor industry's standard inter partes review practice, not a patent-assertion campaign.
Notable case. Advanced Micro Devices, Inc. et al. v. Avago Technologies General IP (Singapore) Pte. Ltd. (PTAB, filed March 28, 2017) challenged patents held by Avago, Broadcom's licensing arm. Outside the tracked set, ATI Technologies ULC has also appeared as patent owner in third-party IPR petitions, e.g. LG Electronics v. ATI Technologies ULC (IPR2015-00325, per Unified Patents).
Sources: Wikipedia (ATI Technologies); AMD–ATI fact sheet; AMD Form 10-K subsidiary exhibits; CB Insights; Unified Patents.