I will begin legging in some long-term (20+ year) investment and am mostly interested in tracking the following:

S&P 500: VOO? IVV?
NASDAQ: QQQ? QQQM? IVNQX?
Dow: DIA? DDM?
Russell: SLY? VIOO? IWM? IWO? IJR? VBR?

What are low expense funds you use to track these indices and why did or would you choose these over other funds?

SWPPX

You do know all funds post their expenses in their prospectus right? And you can get a summary of that prospectus just by clicking the right spot, right? And doing so will give you correct answers instead of some WAG's by us guys, right?
FYI an ETF will have lower expenses than the fund issued by the same company but ETF's have trading expenses.

OP check out etf.com. Great resource.

Morningstar also good of course.

https://www.morningstar.com/articles/1125619/the-best-index-funds

Red Rover said:

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I will begin legging in some long-term (20+ year) investment and am mostly interested in tracking the following:

S&P 500: VOO? IVV?NASDAQ: QQQ? QQQM? IVNQX?Dow: DIA? DDM?Russell: SLY? VIOO? IWM? IWO? IJR? VBR?

What are low expense funds you use to track these indices and why did or would you choose these over other funds?

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These are the ones I have large positions in:

S&P: VOO
Nasdaq: QQQ and ONEQ
Dow: DIA
Russell: IWM