Again, so sorry for your loss. Not defending Vanguard because they can be slow, as you experienced, but they did know "know" your husband was deceased until they received the death certificate. I think your complaint is with your husband's employer's HR department. They should have helped you through this process in my opinion. Unfortunately, I do not think you will succeed with any claim against anyone with regard to this perceived loss. You may be able to keep the account active and hope that the stock market goes back up. It has plummeted during the time period you reference, again, in my opinion, due to President Trump's idea that tariffs would not cause market retaliation. It (the market) may very well right itself in a week or two. The best of luck to you. A trustworthy adviser might be a valuable addition to your team.