The Investment Thread

My "fixed" is a pot of money that can never lose principal and is earning money at a 3% rate.
If it is helpful for you to help me.... here's my situation... I'm paid each month on the 15th and the 30th.
Each time I'm paid, $375 of my pay is directed as a contribution to my 401k. Until yesterday, 50% of my contribution was always allocated to the Science & Tech and the other 50% was allocated to the fixed.
Yet yesterday, I called the company ( Corebridge Financial / AIG ) and changed it for the future. My future contributions will have 75% allocated to the fixed and only 25% to the Science & Tech.
What is a pot of money that can never lose principal at 3%? Money market and interest checking accounts are 1% at best right now. I understand rates have been going up, but parking cash still isn't near 3%. Just wondering what's paying 3% rate if it's not a bond.