What is the current OEX options open interest?

As of May 29, 2026, S&P 100 Index (OEX) has 46 total contracts outstanding across all listed expirations, split as 32 calls and 14 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 OEX put/call open interest ratio?

Put/call OI ratio of 0.44 is call-heavy, often a directional bullish or upside-speculation signal.

What does OEX 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.

S&P 100 Index (OEX) 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.

Snapshot as of May 29, 2026.

Spot Price: $3784.60
Call OI: 32
Put OI: 14
Total OI: 46
Put/Call Ratio: 0.09

As of May 29, 2026, S&P 100 Index (OEX) has 46 total contracts outstanding across all expirations. Put/call OI ratio is 0.44 (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 OEX open interest history Data Feeds Strategy Selection

Strategy selection on S&P 100 Index 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 13.4% 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.

How to read the OEX open-interest data

The open-interest time-series above tracks the total S&P 100 Index options inventory outstanding day by day. OI is a stock measure - the cumulative position count - so trends flag accumulating or distributing positioning. Current put/call ratio is 0.09, call-heavy - speculative or bullish positioning dominates. Total call OI of 32 versus put OI of 14 gives a put/call OI ratio of 0.44 - structurally a slower-moving signal than the volume-based ratio.

OEX flow vs positioning

Volume tells you what flows happened today; OI tells you what positions accumulated. Both can move in opposite directions: rising volume with falling OI means contracts are being closed (covering); rising volume with rising OI means new positions are being opened. The combination matters more than either alone for reading sentiment. Combined with the current positive dealer-gamma regime, large OI clusters tend to act as price magnets through expiration cycles.

Using OEX OI/volume data alongside other surfaces

Per-strike OI is the input to dealer-gamma calculations: strikes with elevated call OI generate gamma walls that dealers must hedge into as spot approaches them. The gamma-exposure page combines this distribution with the dealers' assumed-long-gamma assumption to project hedge flow. Volume cross-checks recent positioning shifts in the chain that haven't yet shown up in cumulative OI. Pair both with the term-structure view on the volatility page to determine whether the activity is concentrated in near-dated event hedging or longer-dated structural positioning. Front-month expiration for OEX sits at 28 days, so near-dated volume currently dominates the flow reading.

Learn how open interest is reported and how to read the data →

Daily open-interest history for OEX options over the last ~41 trading days. Each row reflects the end-of-day total OI summed across all listed strikes and expirations.

Daily values from end-of-day option_ticker_snapshots. Series sparse on illiquid tickers reflects gaps in the upstream end-of-day options data feed.

Most recent 15 trading days (descending). Older history appears in the chart above.

Date	Call OI	Put OI	Total OI	P/C OI
May 29, 2026	32	14	46	0.44
May 28, 2026	33	14	47	0.42
May 27, 2026	32	14	46	0.44
May 26, 2026	32	14	46	0.44
May 22, 2026	34	16	50	0.47
May 21, 2026	33	16	49	0.48
May 20, 2026	31	16	47	0.52
May 19, 2026	11	15	26	1.36
May 18, 2026	11	14	25	1.27
May 15, 2026	53	16	69	0.30
May 14, 2026	52	16	68	0.31
May 13, 2026	52	16	68	0.31
May 12, 2026	52	13	65	0.25
May 11, 2026	52	13	65	0.25
May 8, 2026	52	7	59	0.13

Frequently asked OEX open interest history questions

What is the current OEX options open interest?: As of May 29, 2026, S&P 100 Index (OEX) has 46 total contracts outstanding across all listed expirations, split as 32 calls and 14 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 OEX put/call open interest ratio?: Put/call OI ratio of 0.44 is call-heavy, often a directional bullish or upside-speculation signal.
What does OEX 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.