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SGI US Gravity

Index level: 1984.854 as of 09/17/2021

Main characteristics

Bloomberg code SGIXUSGR
Inception date 10/01/2012
Return type Excess Return
Currency USD

Objective

US equity markets appear to have a tendency to mean revert, meaning that large positive moves are often followed by negative ones (and vice versa).  On average, this should result in a positive spread between the daily and bi-weekly realized variance of the returns of such markets.*
 
The SGI US Gravity Index is a systematic index with its level published daily on Bloomberg, aiming to generate positive performance by capturing this potential spread through hypothetical positions that are long the daily variance and short the bi-weekly variance of the S&P 500 Index.
 
 
* For the purposes of this webpage, daily variance refers to the sum of the squared daily returns of the S&P 500 over the given period, whereas bi-weekly variance refers to the squared sum of the daily returns of the S&P 500 over the given period.

Mechanism

The SGI US Gravity Index takes hypothetical long positions in the daily variance and hypothetical short positions in the bi-weekly variance of the S&P 500 Index.  In addition, these hypothetical positions are rolled only on Tuesdays, Wednesdays, and Thursdays of each week over a two-week period, in order to avoid a potential weekend effect on the volatility of the S&P 500 Index on Mondays and Fridays.

The SGI US Gravity Index began publishing on October 1, 2012. Therefore, all data for the Index for the period prior to October 1, 2012 represent S&P Dow Jones ("S&P DJ"s) application of the Index methodology in order to reconstruct hypothetical historical data for the period prior to October 1, 2012 consistent with the Index methodology. Results prior to October 1, 2012 may have been different had the Index actually been in existence. The SGI US Gravity Index (the “Index”) is the property of SG, which has contracted with S&P Opco, LLC (a subsidiary of S&P Dow Jones Indices LLC) (“S&P Dow Jones Indices”) to maintain and calculate the Index. S&P® is a registered trademark of Standard & Poor’s Financial Services LLC (“SPFS”); Dow Jones® is a registered trademark of Dow Jones Trademark Holdings LLC (“Dow Jones”); and these trademarks have been licensed to S&P Dow Jones Indices. “Calculated by S&P Dow Jones Indices Custom” and its related stylized mark(s) are service marks of S&P Dow Jones Indices and have been sublicensed for certain purposes by SG. Neither S&P Dow Jones Indices, SPFS, Dow Jones nor any of their affiliates shall be liable for any errors or omissions in calculating the Index.
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