# MYY (ProShares Short MidCap400)

ProShares · Leveraged ETFs · data as of Sep 11, 2026

Three months to Sep 11, 2026: MYY returned +3.1% where its own daily promise gave +1.6%, 1.5 points over.

## Key facts

- MYY, what MDY did: −1.9%, as of Sep 11, 2026.
- MYY, what −1 times a day gives: +1.6%, as of Sep 11, 2026.
- MYY, what the fund returned: +3.1%, as of Sep 11, 2026.
- MYY, the fund itself added: +1.5 pts, as of Sep 11, 2026.
- MYY, net assets: $3m (source, as filed for May 31, 2026).
- MYY, expense ratio: not read by ETFIQ, as of Sep 11, 2026.

## MYY over each window to Sep 11, 2026

| Window | Fund | MDY | -1x the move | Difference | MDY moved about |
| --- | --- | --- | --- | --- | --- |
| 1 month | +5.3% | −4.6% | +4.6% | +0.7 pts | 11% |
| 3 months | +3.1% | −1.9% | +1.9% | +1.2 pts | 12% |
| 6 months | −8.9% | +11.6% | −11.6% | +2.7 pts | 15% |
| 1 year | −8.1% | +13.0% | −13.0% | +4.9 pts | 15% |
| 3 years | −24.4% | +49.2% | −49.2% | +24.8 pts | 18% |
| Since launch | −89.4% | +520.9% | not meaningful over this window | not meaningful over this window | 20% |

## Every published field

| Field | Value | Source |
| --- | --- | --- |
| Sets out to return | -1 times the daily move of MDY, reset daily | ETFIQ |
| Multiple a holder actually got over the window | MDY moved −1.9% over this window, too little to read a multiple from | ETFIQ |
| Underlying | MDY | ETFIQ |
| Segment | broad index, us mid cap | ETFIQ |
| Net assets | $3m | source, as filed for May 31, 2026 |
| Expense ratio | not read by ETFIQ | ETFIQ |
| Launched | Jan 4, 2010 | ETFIQ |
| Underlying volatility over the window | 12% annualized | ETFIQ |

## Questions

### Did MYY return -1 times MDY?

Over the window to Sep 11, 2026, MDY moved −1.9% and MYY returned +3.1%. 1 times that move is +1.9%, so the fund came out 1.2 points ahead of it.

### Why does MYY not return -1 times over a year?

Because it resets daily. MYY aims at -1 times each day's move, and daily results compound. Over a run where the underlying falls and comes back, compounding a levered daily return leaves a holder behind what -1 times the period move would suggest; over a steady run in one direction it can leave them ahead. The longer the holding, and the more the underlying moves about, the further apart the two figures get.


## Cite this page

ETFIQ, MYY, data as of Sep 11, 2026. https://etfiq.com/funds/MYY
Free to use with attribution; the underlying files are at https://etfiq.com/data/.

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