State Street SPDR S&P MIDCAP 400 ETF Trust (MDY) Open Interest History
Open interest tracks the total number of outstanding options contracts. Rising OI alongside price moves can indicate growing commitment to the trend; declining OI suggests positions are being closed.
State Street SPDR S&P MIDCAP 400 ETF Trust (MDY) operates in the Financial Services sector, specifically the Asset Management industry, with a market capitalization near $25.73B, listed on AMEX, carrying a beta of 1.07 to the broader market. The State Street SPDR S&P MIDCAP 400 ETF Trust seeks to provide investment results that, before expenses, correspond generally to the price and yield performance of the S&P MidCap 400 Index (the “Index”) public since 1995-05-04.
Snapshot as of May 15, 2026.
- Spot Price
- $659.83
- Call OI
- 11.4K
- Put OI
- 19.0K
- Total OI
- 30.5K
- Put/Call Ratio
- 15.44
As of May 15, 2026, State Street SPDR S&P MIDCAP 400 ETF Trust (MDY) has 30.5K total contracts outstanding across all expirations. Put/call OI ratio is 1.66 (put-heavy positioning, often indicating hedging or bearish bias). Open interest reflects accumulated positions from prior sessions; persistent growth indicates sustained directional or hedging interest, while sharp drops typically mean post-expiration clean-up.
How MDY open interest history Data Feeds Strategy Selection
Strategy selection on State Street SPDR S&P MIDCAP 400 ETF Trust options does not derive from any single metric in isolation. The open interest history view above sits inside a broader read: ATM IV currently sits at 19.3% and dealer gamma exposure is negative, so dealer hedging amplifies directional moves. Combine the open interest history data here with the volatility-skew surface, dealer-gamma exposure, max-pain level, and upcoming-events calendar to build a positioning thesis. Risk-defined structures (credit spreads, debit spreads, iron condors) are usually safer than naked positions while the regime is uncertain; the data on this page anchors the inputs but does not by itself constitute a trade thesis.
Learn how open interest is reported and how to read the data →
Frequently asked MDY open interest history questions
- What is the current MDY options open interest?
- As of May 15, 2026, State Street SPDR S&P MIDCAP 400 ETF Trust (MDY) has 30.5K total contracts outstanding across all listed expirations, split as 11.4K calls and 19.0K puts. Open interest reflects accumulated positions from prior trading sessions; it does not include today's volume until end-of-day reconciliation.
- What is the MDY put/call open interest ratio?
- Put/call OI ratio of 1.66 is put-heavy, often indicating hedging demand or bearish positioning.
- What does MDY open interest tell traders?
- Persistent OI growth indicates sustained directional or hedging interest; sharp drops typically mean post-expiration position cleanup. Heavy OI concentrations at specific strikes act as support and resistance levels because dealer hedging amplifies near those strikes - the gamma profile of the dealer book is concentrated there. Comparing today's volume to standing OI separates opening flow from closing flow.