Eaglestar

Eaglestar is a private security firm.

History
After S.H.I.E.L.D. agent Natasha Romanoff was accused of killing russian arms dealer Mikhail Fjodorov during an undercover mission, Natasha was forced to flee to the Moscow hotel she was staying

In that hotel, she was attacked by four mercenaries from Eaglestar, hired by Sofia, Fjodorov's actual killer and Romanoff's rival.

Despite that the mercenaries were very well equipped and they took Romanoff by surprise, she was able to overpower them, and went to interrogate one of the survivors.

Romanoff found that each of them were carrying a SIM card so that the Black Widow could contact Sofia after defeating the mercenaries.

Trivia

 * In the comics, Eaglestar International is a defense contracting firm allied with H.A.M.M.E.R.