SRP: Settlement Reference Price for each SPY option, used in final SPKCS calculation.
CRP1: Cash Reference Price (used in SPIKES index calculation) at time of SRP, (unique time for each SPY strike).
CRP2: Cash Reference Price (used in SPIKES index calculation) at settlement time, (same time for all SPY strikes).
The SPIKES settlement auction for August 2021 was conducted smoothly without any issues. The settlement value was slightly lower than the spot index values.
There were no SPY option trades during this SPIKES settlement. The mid-price of National Best Bids and Offers (NBBOs) were used for all SPY options included in the final settlement calculation.
Relative to the Cash Reference Prices (CRPs) used in the SPIKES index calculation, the Settlement Reference Prices (SRPs) were slightly higher in the CALL strike range and slightly lower in the PUT strike ranges.
Compare actual settlement options volume with variance swap formula projection.
There were no SPY option trades during this SPIKES settlement auction.
A visualisation of the settlement option prices and their equivalents in the SPIKES index calculation.
The Settlement Reference Prices (SRPs) were mostly consistent with the corresponding CRP values across the entire strike range.
Strike by strike comparison of SRP and the corresponding CRPs.
The CRP range for the SPY options was up to 7c wide at the near-the-money strikes and no more than 1c wide at the farout-of-the-money strikes. The SRPs were often 1-4 cents lower than the CRP values in the lower strikes, and up to 10-15c different from the CRP in the near-the-money strikes.
Replace some or all of the SRPs with the CRPs in the settlement calculation and see how different the results are.
The SPKCS settlement value was slightly lower than the CRP values, due to marginally lower SRP values in the PUT strike ranges.
Replace some or all of the SRPs with the CRPs and see how many SPY options are used in the settlement calculation.
Higher SRP values in the far-out-of-the-money strikes led to four additional strikes being included in the settlement calculation than the CRP values would imply.