Marzs Index · S&P 500 replica

Marzs Index

A cap-weighted basket of the S&P 500: 500 names struck against $92,900. Because a cap-weighted S&P 500 basket tracks SPY to a negligible error, its value is read through SPY rather than pricing 500 names a day. The full weighting is shown below for transparency.

Allocation

$92,900

Today (via SPY)

+0.7%

Holdings

500

Top 10 weight

36.6%

Vs SPY

tracks (S&P 500 replica)

The shape of the index

Every name sized by its true index weight. A cap-weighted index is a handful of names doing the work: the top 10 are 36.6% of the whole and the long tail is the fine grain. Hover any tile for its name and weight.

Top holdings by weight

The 30 largest of 500 positions. The remaining 470 names carry 45.9% of the index.

1NVDANVIDIA7.6%$7,107
2AAPLApple6.8%$6,336
3MSFTMicrosoft4.4%$4,078
4AMZNAmazon3.6%$3,363
5GOOGLAlphabet

Method: this is a cap-weighted S&P 500 replica, so its return is read through SPY (the same benchmark the books are measured against) — accurate to a negligible tracking error and far cheaper than pricing 500 names daily. The day it is tilted away from the index, per-constituent pricing is added so the value reflects the tilt. Not investment advice.