Nothing stops you from going to your manager (or, during your probably-annual comp discussion) and saying, "Based on {a conversation with my coworker, Levels.fy

Nothing stops you from going to your manager (or, during your probably-annual comp discussion) and saying, "Based on {a conversation with my coworker, Levels.fyi, a competing offer}, I believe I'm being underpaid." Obviously this discussion has varying credibility depending on how serious you are about switching jobs, so a competing offer helps--but it also helps to know your manager's range of options. My general advice is to try to understand the range of options first. For example, you can ask your manager, "Can you tell me where I stand in the comp range for my level?" That will let you know how much base salary growth you can likely expect or negotiate for without a promo. Similarly, "If I have a competing offer, do you have leeway to make a retention RSU grant?" would be good to know. The key point is a) this isn't your manager's money, so they shouldn't be too personally invested in it, but b) they also don't have a huge amount of discretion and there's a lot of formula behind it, so understanding how the formula relates to you is a good start.