SPY 640 Put Hits 147,551 Trades—What’s Driving This 5.1% Share of Daily Options Volume?
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By 10:59 AM, the SPY Mar-31-26 640 Put option had already traded 147,551 contracts—accounting for an outsized 5.1% of total SPY option activity for the session. With SPY shares up 1.31% to $640.22 and barely hovering above the 640 strike, today’s zero-days-to-expiration (0DTE) put option is grabbing traders’ attention.
Trade Activity Centers on the 640 Strike as SPY Trades in $638–$643 Range
This morning’s activity is especially notable considering the option’s underlying—the S&P 500 ETF—ranged between $638.31 and $642.95. That places the current SPY price a slim $0.22 above the key 640 strike. The Mar-31-26 640 Put traded a high of $3.39 and sank to a low of $1.14, with a volume-weighted average price (VWAP) of $1.78. This tight price cluster around an at-the-money strike reflects a battle between short-term bulls and bears ahead of the session’s close.
| Contract | Trade Volume | % of Total Option Volume | VWAP | Open Interest (7:00 AM) |
Stock Price | SPY Price Range |
|---|---|---|---|---|---|---|
| Mar-31-26 640 Put | 147,551 | 5.1% | $1.78 | 19,623 (?3,012) |
$640.22 | $638.31 – $642.95 |
Mixed Order Flow: Retail Slightly Overtakes Large Professional Trading
Today's order flow in the 640 Put is nearly balanced, with 45.6% of contracts bought and 54.4% sold. Notably, the majority of trades (53%) are attributed to small or retail traders, slightly edging out large professionals (47%). This distribution hints at both speculative activity from the retail crowd and active positioning—possibly hedging or income strategies—among bigger market participants.
Open Interest Declines—Implying Position Reduction Ahead of Expiry
While real-time open interest won’t update until after the session, recent numbers show it declined 3,012 contracts to 19,623 as of this morning. This suggests yesterday’s heavy trading was more about closing positions than opening new ones—potentially a sign that traders with profits or losses on the line sought to wrap things up ahead of today’s 0DTE expiration.
Price Action and Volume Create Intrigue—Who Wins If SPY Holds $640?
With SPY now perched just above the strike, this put could finish the day nearly worthless if the market holds or rallies further. Conversely, even a slight dip below $640 would quickly benefit holders of today’s most active contract. The low of $1.14 and high of $3.39 demonstrate how quickly premiums erode—or spike—when time is short and action is close to-the-money.
Takeaway: Watch SPY’s Close for Resolution of This Heavy-Bet Short-Term Standoff
The staggering 147,551 contracts traded on the SPY Mar-31-26 640 Put underscores how zero-day options are being used for quick bets—or rapid hedges—at crucial market junctures. While open interest data points to previously waning positions, today’s volume, retail participation, and price volatility suggest traders are positioning quickly ahead of the closing bell. As always with 0DTE options, the drama peaks at the end of the session—making today’s close especially worth watching if SPY continues to hover near $640.
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