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# Diagonal Volatility Carry: August 2026
- URL: https://www.rivativ.ai/monthly-diagonal-2026-08/
- Published: 2026-09-09T07:58:24.000Z
- Updated: 2026-09-09T07:58:58.000Z
- Author: Theo Paraskevopoulos

> The Diagonal Volatility Carry strategy returned +3.39% in August, outperforming the S&P 500 by +0.71% as the VIX near multi-year lows allowed the net-short VIX call structure to harvest steady carry across a month of calm, trending equity markets. The result illustrates the strategy's core dynamic: when implied volatility drifts lower and no spike materialises, the premium decay engine runs cleanly and adds a return stream entirely independent of equity direction.

The Diagonal Volatility Carry strategy returned +3.39% in August, outperforming the S&P 500 benchmark by +0.71% in a month that proved more constructive for this structure than the headline calm might suggest. The strategy harvests the volatility risk premium through a net-short VIX call ratio — selling nearer-the-money VIX calls against a smaller number of further-out-of-the-money long calls — and August delivered the conditions in which that carry engine runs cleanly. 

The VIX spent most of the month near 14, its lowest level of 2026, meaning the nearer-the-money short calls decayed steadily with no spike threatening the uncapped upside of the net-short position. Warsh's Jackson Hole address on 29 August did lift the VIX, closing the month at 14.92, but the move was modest and orderly — well within the range the structure absorbs without meaningful stress. The VaR engine, which reduces size as volatility rises, would have trimmed exposure slightly during the late-month uptick, but not enough to offset the carry earned over the rest of August. The result is a clean illustration of the strategy performing as designed: steady premium decay in a low-volatility, trend-following equity environment.

### Talking Points

- The strategy outperformed the S&P 500 by +0.71% in August by doing exactly what it is designed to do: collecting the gap between implied and realised volatility as it closes. With the VIX near multi-year lows for most of the month, the premium embedded in the short VIX call positions decayed steadily in the strategy's favour, adding a return stream that had no dependency on equity direction.
- The late-month volatility nudge from Jackson Hole was absorbed without disruption, demonstrating the risk engine working as intended. The VIX move from intraday lows near 14 to a close of 14.92 on 31 August was modest; the position's sizing mechanism, which scales down exposure as volatility rises, dampened any impact, and the long upper leg of the ratio provided additional cushion. This is the strategy's risk discipline in action, not a near-miss.
- Clients should be clear that this strategy carries a genuinely uncapped tail in an extreme volatility spike — and August's calm is a reminder of why sizing discipline matters. The strategy earns well in the stretches between shocks, but a sharp enough VIX move can produce losses that exceed many months of accumulated carry. August was the favourable side of that trade-off; clients should hold both outcomes in mind when assessing performance.

![](https://storage.ghost.io/c/bf/48/bf480f38-3f03-400d-b1af-7b0188655ac7/content/images/2026/09/2026-08-31_strategy_performance_Strategy_2.png)