@akatta No need to cite literature or B&B, we don’t accept those sources. Thought this sounded true so I checked:
AMBOSS says most commonly at branch points (internal carotid or MCA) [though, they only highlight the MCA for Step 1] https://next.amboss.com/us/article/iJ0JFS?q=thrombotic%20ischemic%20stroke#Yce08e01dc84b6b8064e6844906747f88
FA23 pg527 still just says commonly MCA