I've had some of my HSA invested in VFIAX, an s&p 500 passive fund and also fourth largest fund in the US. My new HSA provider does not offer the fund. On offer are: VSIAX (Small value), VIGIX, VIIIX, VMVAX, VSMAX, and VVIAX. Ideas for how to continue my index tracking? I can mix and match these in any percentage to recreate the VFIAX fund (which I have requested be added).
Of the funds listed VIIIX most closely matches VFIAX if you are still looking for a large cap index fund.
If you read the prospectus of each fund you'll find that they are both attempting to match the S&P 500 index as closely as possible.