| Year | Detail |
| 1987 |
Gilead founded. |
| 1990 |
AmBisome approved (in Europe). |
| 1991 |
Nucleotides in-licensed from IOCB Rega. |
| 1996 |
Vistide approved. |
| 1999 |
NeXstar acquired (establishment of European operations). |
| 2001 |
Viread approved. |
| 2002 |
Hepsera approved. |
| 2003 |
Acquired Triangle Pharmaceuticals. |
| 2004 |
Truvada approved. |
| 2007 |
Cork, Ireland, manufacturing facility acquired from Nycomed. |
| 2008 |
Viread for hepatitis B approved; Lexiscan approved. |
| 2010 |
Cayston approved; CGI Pharmaceuticals acquired. |
| 2011 |
Acquired Arresto BioSciences and Calistoga Pharmaceuticals. |
| 2012 |
Acquired Pharmasset. |
| 2013 |
Acquired YM BioSciences. |
| 2022 |
Gilead and MacroGenics Announce Oncology Collaboration to Develop Bispecific Antibodies. |
| 2023 |
Gilead Sciences and Arcus Biosciences Expand Partnership. |
| 2024 |
Gilead Sciences acquisition of CymaBay Therapeutics. |