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“Do I Have To Worry About Another Volatility Spike”- A Q&A With Goldman’s Head Quant

Courtesy of ZeroHedge. View original post here.

After a day of conference calls with investors, Goldman's newly-hired quant Rocky Fishman has assembled the most frequently asked questions that are relevant for trading dynamics in the VIX and equities in the coming days.

Here is the result: Goldman's Q&A on the Trading Dynamics of ETPs

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1. Do I have to worry about VIX ETPs driving another similar volatility spike?

Not for now, and not likely anytime soon. The large short VIX products were the primary driver of Monday afternoon's late-day acceleration in the VIX, and with them diminished ($300mm AUM now vs $3.9bln peak AUM), the quantity of VIX futures ETP issuers would have to buy on a further volatility spike is diminished as well. Levered long ETPs remain sizable ($1.1bln AUM), but per unit of VIX futures exposure, they trade less on a volatility spike than inverse products would (filling the gap between long futures that have risen and a fund NAV that has risen faster requires fewer units of futures than between a NAV and futures position that are moving in opposite directions). The higher level of VIX futures also makes an N-point move a lower percentage move than it would be with lower VIX futures prices.

2. What’s the impact of the XIV (and Japan-listed 2049) redemption? What’s the impact of the SVXY continuing to trade?

The previously sizable short VIX ETPs no longer have a significant impact on the VIX futures market because Monday's sell-off pushed their AUM down so much that their VIX futures holdings would be immaterial to the broad market (the SVXY is short less than 1% of VIX futures open interest), regardless of whether or not they continued trading.

3. Why were VIX futures and S&P futures both down throughout much of Tuesday's trading day?

Typically, VIX futures rise when S&P 500 futures are falling; however, VIX futures had such outsized, technicals-driven buying pressure on Monday afternoon that the absence of this was enough to allow VIX futures to fall on Tuesday, even in the context of an initially weaker equity market.

4. Were short ETPs a material percentage of the VIX futures market? What implications do this week’s events have on VIX future trading volumes?

VIX future volumes closely track VIX ETP trading volumes, so we would expect a material drop in ETP volumes due to the lack of sizable short ETP trading activity to result in a similar drop in VIX future volumes. We estimate short VIX ETPs constituted over 40% of ETP trading volume in January, when measured in VIX future-equivalent terms. While VIX derivatives naturally are active when volatility is moving around, we expect VIX future volumes to fall below – perhaps substantially below – their typical 2017 range (1st & 2nd futures volume was 30% higher than the typical 2015-6 volume) as conditions normalize.

5. Is there a transmission mechanism by which VIX futures activity can lead to S&P 500 trading?

Investors may use S&P 500 futures to hedge some of the risk of short VIX future positions. If some of the investors selling VIX futures to ETP issuers on Monday simultaneously sold SPX futures as a hedge against the market risk inherent in their short VIX future positions, their positioning could potentially have impacted equity prices. High volatility can also pressure equity prices via flows from systematic volatility-linked funds, investor confidence, and VAR-driven risk reduction.

6. Was this technical selloff expected? Should vol-of-vol (i.e., VIX option prices) be structurally higher given what has taken place?

VIX option prices had been abnormally high for the current low level of volatility throughout much of January as investors had priced in some risk of outsized short VIX ETPs causing turmoil like Monday's. In effect, option pricing implied that should volatility rise, it would rise quickly. With the short VIX ETP market now small, we think that implied volatility of VIX options should reset to levels lower than the last few months once conditions normalize, which could create opportunities to sell VIX options.

7. If the AUM of short VIX ETPs was only $3.9bn at their peak, why are they important?

8. Why do short and levered long VIX ETPs both buy more VIX futures when volatility spikes?

9. Can VIX ETPs cause vol to fall abnormally quickly just like they caused this rise?

10. Why do issuers have to trade near the 4:15 futures market close?

11. Did the XIV and SVXY cause 2017's surprisingly low VIX range? Now that they are diminished will volatility return?

In our view, 2017's low VIX range was driven primarily by low S&P 500 realized volatility (the lowest S&P 500 realized volatility since 1964), which was a byproduct of low volatility across asset classes, low intra-SPX correlation, and benign economic conditions. We do not see evidence that VIX ETPs furthered this in any material way.

12. What is vega?

Vega is a measurement of volatility risk that represents dollars per volatility point. Because the contract has a 1,000 multiplier, each VIX futures contract carries 1,000 vega – i.e. its value changes by $1,000 for each point that the VIX futures price moves. The amount of vega in any one VIX ETP share changes over time, as the amount of VIX futures exposure that can "fit" inside a share is a function of the share's NAV and the price of VIX futures. Short VIX ETPs had seen their vega per share grow quickly in late 2017, but now the SVXY has very little vega per share.

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