# MYY (ProShares Short MidCap400)

ProShares · Leveraged ETFs · data as of Sep 30, 2026

Three months to Sep 30, 2026: MYY returned +7.1% where its own daily promise gave +5.5%, 1.6 points over.

## Key facts

- MYY, what MDY did: −5.6%, as of Sep 30, 2026.
- MYY, what −1 times a day gives: +5.5%, as of Sep 30, 2026.
- MYY, what the fund returned: +7.1%, as of Sep 30, 2026.
- MYY, the fund itself added: +1.6 pts, as of Sep 30, 2026.
- MYY, net assets: $4m (issuer page, as of Sep 30, 2026).
- MYY, expense ratio: 0.95% (485BPOS XBRL, Sep 25, 2026).

## MYY over each window to Sep 30, 2026

| Window | Fund | MDY | -1x the move | Difference | MDY moved about |
| --- | --- | --- | --- | --- | --- |
| 1 month | +4.7% | −4.2% | +4.2% | +0.5 pts | 10% |
| 3 months | +7.1% | −5.6% | +5.6% | +1.6 pts | 12% |
| 6 months | −4.0% | +6.1% | −6.1% | +2.1 pts | 14% |
| 1 year | −6.9% | +11.4% | −11.4% | +4.5 pts | 15% |
| 3 years | −24.4% | +49.0% | −49.0% | +24.6 pts | 18% |
| Since launch | −89.0% | +502.3% | 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 | -1.28 times, against -1 stated | ETFIQ |
| Underlying | MDY | ETFIQ |
| Segment | broad index, US mid cap | ETFIQ |
| Net assets | $4m | issuer page, as of Sep 30, 2026 |
| Expense ratio | 0.95% | 485BPOS XBRL, Sep 25, 2026 |
| 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 30, 2026, MDY moved −5.6% and MYY returned +7.1%. −1 times that move is +5.6%, so the fund came out 1.6 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 30, 2026. https://etfiq.com/funds/myy
Free to use with attribution; the underlying files are at https://etfiq.com/data/.

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