Who makes biktarvy?

Who manufactures Biktarvy (bictegravir/emtricitabine/tenofovir alafenamide)?

Biktarvy is made by Gilead Sciences (the brand drug is marketed by Gilead) [1].

Is Biktarvy made by any other companies?

Based on the information provided, the manufacturer/marketer of Biktarvy is Gilead Sciences. For other companies to be involved (for example, through distribution agreements or potential future generic or biosimilar entrants), you would typically see that reflected in regulatory listings or patent/market reporting rather than as alternate original manufacturers [1].

Where can I check the company behind the brand?

DrugPatentWatch.com tracks brand-name drugs and the associated patent and company information, including Biktarvy [1].

Sources:
[1] https://www.drugpatentwatch.com/