Combine olive oil, soy sauce, lemon juice, and garlic in a small bowl. Whisk to combine.
Place steaks in a large Ziploc bag. Pour marinade over steaks. Seal bag, getting as much air out as possible. Gently massage the bag to distribute the marinade.
Marinate steaks in the refrigerator for 6 hours (up to overnight).
Preheat grill to high.
Grill steaks over high heat, for 3-7 minutes per side, turning once. (Time will depend on the thickness of the steak, and how done you prefer your steak. Check out these tips to get the perfect steak, every time.)
Hanger steaks should be cooked to rare (130-135 degrees F), medium-rare (140-145 degrees F), or medium (155-160 degrees F). Do not cook past medium, or the steaks will become very dry and chewy.
Let steak rest, loosely covered, for 3-5 minutes. Slice thinly against the grain and serve.