[tomato2juice]

Estimate your tax obligation and pay the IRS before you lose it or spend it all: https://www.irs.gov/businesses/small-businesses-self-employe...

Then invest the remainder into an index fund or retirement fund. If you don't know where to start, then look here: https://investor.vanguard.com/mutual-funds/target-retirement...

[surfsvammel]

If you are putting this into any kind of security, be that equity or fonds, spread the investment over time to minimise the risk of temporary flux on the markets. Spread it out over a couple of years.

Also, there are even lower risk alternatives you can go for, if you are anything like me, who does not sleep well knowing your investments move with the markets.

Another tip I got for you, is to spend some of the money. As you said, it's a jackpot, you should celebrate. Spend some of it. Travel maybe?

[tinyjackpot]

The $150k was already post-tax, and the withholdings are (expected to be) higher than my actual tax rate EOY, so I should get some more in my returns.

[gshdg]

This but before investing put 3 months living expenses (or 6mo if you’re feeling conservative) into a savings account as an emergency fund.