MDY Short Interest
State Street SPDR S&P MIDCAP 400 ETF Trust (MDY) operates in the Financial Services sector, specifically the Asset Management - Global industry, with a market capitalization near $26.57B, listed on AMEX, carrying a beta of 1.04 to the broader market. This fund, the State Street SPDR S&P MIDCAP 400 ETF Trust, strives to offer investment returns that, before factoring in costs, generally reflect the capital appreciation and dividend income performance of the S&P MidCap 400 Index. public since 1995-05-04.
Short interest is the total number of shares currently sold short and not yet covered, reported bi-monthly by FINRA. Days to cover (short interest divided by average daily volume) indicates how long it would take short sellers to close positions, with higher values signaling greater squeeze potential.
- Settlement Date
- 2026-06-15
- Short Interest
- 1.7M
- Previous Short Interest
- 1.4M
- Change
- 24.00%
- Days to Cover
- 2.00
- Avg Daily Volume
- 848.1K
- Avg Days to Cover (24 reports)
- 1.97
Showing 24 bi-monthly FINRA short interest reports for State Street SPDR S&P MIDCAP 400 ETF Trust.
Learn how short interest is reported and how to read the data →
Frequently asked MDY short interest questions
- What is the current MDY short interest?
- As of the Jun 15, 2026 settlement, State Street SPDR S&P MIDCAP 400 ETF Trust (MDY) short interest is 1.7M shares, a +24.00% change from the prior period. FINRA publishes short interest twice monthly on the 15th and last business day of each month under Rule 4560.
- What is the MDY days-to-cover ratio?
- Days-to-cover is 2.00, calculated as short interest divided by average daily volume. It estimates how many trading days closing all short positions would consume given typical liquidity. Values above 5 days are commonly cited as elevated; values above 10 days are squeeze-relevant.
- How does MDY short interest affect options pricing?
- High short interest changes options pricing through three mechanics: borrow-rebate effects (synthetic long stock trades below frictionless put-call parity by approximately the borrow rebate when shares are hard-to-borrow), gamma-squeeze setup risk (if dealers are short gamma against retail call buying, dealer hedge flow can amplify upward moves), and elevated event-vol pricing on names with squeeze potential. See the canonical short-interest documentation for the full mechanism.