Vanguard Mid-Cap ETF (VO) 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.
Vanguard Mid-Cap ETF (VO) operates in the Financial Services sector, specifically the Asset Management industry, with a market capitalization near $197.84B, listed on AMEX, carrying a beta of 1.02 to the broader market. Seeks to track the performance of the CRSP US Mid Cap Index, which measures the investment return of mid-capitalization stocks. public since 2004-01-30.
Snapshot as of May 15, 2026.
- Spot Price
- $76.63
- Call OI
- 4.0K
- Put OI
- 895
- Total OI
- 4.9K
- Put/Call Ratio
- 0.13
As of May 15, 2026, Vanguard Mid-Cap ETF (VO) has 4.9K total contracts outstanding across all expirations. Put/call OI ratio is 0.22 (call-heavy 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 VO open interest history Data Feeds Strategy Selection
Strategy selection on Vanguard Mid-Cap 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 18.7% and dealer gamma exposure is positive, so dealer hedging is mechanically mean-reverting. 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 VO open interest history questions
- What is the current VO options open interest?
- As of May 15, 2026, Vanguard Mid-Cap ETF (VO) has 4.9K total contracts outstanding across all listed expirations, split as 4.0K calls and 895 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 VO put/call open interest ratio?
- Put/call OI ratio of 0.22 is call-heavy, often a directional bullish or upside-speculation signal.
- What does VO 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.