iShares MBS ETF (MBB) 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.
iShares MBS ETF (MBB) operates in the Financial Services sector, specifically the Asset Management industry, with a market capitalization near $38.18B, listed on NASDAQ, carrying a beta of 1.13 to the broader market. The iShares MBS ETF (MBB) seeks to track the investment results of an index composed of investment-grade mortgage-backed pass-through securities issued and/or guaranteed by U. public since 2007-03-16.
Snapshot as of May 15, 2026.
- Spot Price
- $93.55
- Call OI
- 526
- Put OI
- 675
- Total OI
- 1.2K
- Put/Call Ratio
- 2.00
As of May 15, 2026, iShares MBS ETF (MBB) has 1.2K total contracts outstanding across all expirations. Put/call OI ratio is 1.28 (balanced positioning). 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 MBB open interest history Data Feeds Strategy Selection
Strategy selection on iShares MBS ETF 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 5.3% 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 MBB open interest history questions
- What is the current MBB options open interest?
- As of May 15, 2026, iShares MBS ETF (MBB) has 1.2K total contracts outstanding across all listed expirations, split as 526 calls and 675 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 MBB put/call open interest ratio?
- Put/call OI ratio of 1.28 is balanced.
- What does MBB 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.