COST Stock: Unusual Put Activity Surfaces as Costco Shares Trade Near Midpoint of 52-Week Range

March 19, 2026

By TrendSpider Editor

COST Stock: Unusual Put Activity Surfaces as Costco Shares Trade Near Midpoint of 52-Week Range

A single unusual options contract has drawn attention in Costco Wholesale Corporation, with a deep out-of-the-money put carrying a premium of $1,680,800 flagged in today's session. Shares of COST are trading at $976.22, down 0.38% on the day, and sit roughly in the middle of the stock's 52-week range of $844.06 to $1,067.08. The contract's open interest surge of 9,550% above normal levels makes it one of the more notable single-contract prints seen in the name recently.

Key Drivers of the COST Stock Move

Main Catalyst: One unusual put contract was flagged today at the $900 strike expiring December 15, 2028, with a volume of 191 contracts against an open interest reading reflecting a 9,550% spike. The total premium on the contract is $1,680,800, signaling a large, deliberate position rather than routine flow.
Bull Case: The $900 strike sits roughly 7.8% below today's price of $976.22, meaning the buyer of this put only profits if COST falls to a level not seen since below the current 52-week low of $844.06 over the next several years. Many traders interpret deep OTM long puts as portfolio hedges rather than directional bets, suggesting institutional confidence in the stock's upside while managing tail risk.
Bear Case: A nearly $1.7 million premium commitment on a single bearish contract expiring in late 2028 cannot be dismissed outright. The 9,550% open interest anomaly indicates this is not a routine trade, and with COST already trading 8.5% off its 52-week high of $1,067.08, the position could reflect growing concern about the stock's longer-term valuation or macro conditions over the next two-plus years.

Looking ahead, the December 2028 expiration gives this position an unusually long runway, spanning multiple earnings cycles, potential shifts in consumer spending, and macroeconomic conditions that are difficult to forecast today. Costco's business model, anchored in membership fees and high-volume warehouse retail, has historically held up well during periods of economic uncertainty, which may be precisely why a sophisticated player is using cheap downside protection rather than exiting exposure outright. The extended time horizon of this contract suggests the entity behind it is managing a large long position in COST rather than making an outright bearish call on near-term fundamentals. With shares sitting comfortably above the 52-week low but nearly $91 below the 52-week high, the stock is at a technically neutral juncture where both bull and bear cases have merit heading into the next several quarters.

COST Unusual Options Activity

Contract 1: Put | Strike: $900 | Expiry: December 15, 2028 | Volume: 191 | Open Interest Change: 9,550% above normal | Out of the Money | Premium: $1,680,800

Only put activity was flagged today, with zero calls reported in the unusual flow scan. The sole contract represents the entirety of the $1,680,800 in total premium flagged for COST in today's session.

COST Seasonality

March has historically been a transitional month for Costco, falling between the holiday sales period and the spring membership renewal and travel-related spending cycle. Options activity tied to multi-year expirations placed in mid-March tends to capture at least two full fiscal year cycles, making the timing of this position relevant from a long-term strategic hedging standpoint.

COST Relative Performance

COST is down 0.38% in today's session, trading at $976.22. With a 52-week range of $844.06 to $1,067.08, the stock is currently positioned approximately 15.6% above its 52-week low and about 8.5% below its 52-week high, suggesting the stock remains in a healthy but not extended position relative to its trailing one-year range.