Costco Wholesale stock trades near record territory as investors eye upcoming Medicare plans and earnings

Costco Wholesale stock (ISIN US22160K1051) is trading close to its recent highs in August 2026 as investors weigh a rich valuation, fresh product initiatives such as Medicare plans and the next earnings release set for September 24, 2026.

Costco share price and recent performance

Per recent market data as of August 18, 2026, Costco Wholesale shares closed at $961.35 on the Nasdaq, representing a daily gain of 0.82% and leaving the stock fractionally positive for the year to date.

The same pricing snapshot shows a closing quote of $961.09 on a parallel CBOE venue, with a daily increase of 0.79% and a year-to-date performance of 10.58%, underscoring that Costco stock has provided double-digit gains so far in 2026.

Over the last few sessions leading into August 18, 2026, recent closing prices around $949.57, $961.55, $960.92 and $953.57 form a tight trading range just below the $1,000 mark, signaling that the stock has consolidated after a strong multi-month run rather than extending sharply higher.

Valuation and analyst context

According to a recent valuation overview using the GF Value framework, Costco is trading at $953.50 per share, versus an intrinsic value estimate of $1,033.02 per share, implying that the stock is 7.7% below that fair value metric and viewed as undervalued on this specific model.

That same analysis highlights the gap between the current trading price and the GF Value line, suggesting upside potential if Costco continues to execute on membership growth, new service offerings and cost discipline, even after a substantial year-to-date share price advance.

Sector-oriented rating data show Costco referenced among retail names with positive performance since the start of 2026, including a related euro-denominated listing that has gained 11.28% from January 1, 2026, reinforcing the picture of Costco as a relative winner in the broader consumer discretionary and staples landscape.

Upcoming earnings and consensus focus

Per a recent earnings-season preview, Costco is scheduled to release its next set of quarterly results on September 24, 2026, making the report a key milestone for confirming that membership trends, comparable sales and margin dynamics still justify the current valuation.

The timing places Costco toward the later part of the reporting cycle for major US retailers, which may allow investors to benchmark its performance against peers such as Walmart and other big-box names once their numbers for the same period are available.

Consensus expectations around that fiscal quarter will likely center on continued same-store sales growth, expansion in higher-margin categories and stability in renewal rates, with any deviation from these trends potentially driving a meaningful reaction in Costco stock given how close shares already trade to model-based fair value estimates.

Competitive positioning against peers

Recent comparative analysis between Costco and rival big-box retailers such as Walmart points out that both companies have delivered strong multi-year shareholder returns, but Costco often commands a premium valuation based on its membership-driven model and historically high renewal rates.

In the referenced comparison, stock prices used for evaluating performance and valuation multiples were taken from the afternoon of August 14, 2026, placing Costco within a cohort of large retailers that have seen substantial appreciation over the past year on the back of resilient consumer demand and operational efficiency.

For investors, one of the key quantified takeaways is that Costco stock has posted a double-digit year-to-date gain of 10.58% as of August 18, 2026, while still trading 7.7% below the GF Value estimate, a combination that suggests strong realized performance with room for further upside if upcoming results meet or exceed expectations.

New Medicare plans extend the membership model

A recent feature story notes that Costco is expanding beyond its traditional mix of bulk groceries, fuel and travel services by preparing to offer Medicare plans, building on its ability to cross-sell financial and insurance products to members.

The article highlights how Costco already uses its retail footprint to distribute vacations and gasoline, and now plans to leverage its trusted brand and large membership base to introduce Medicare plan offerings, broadening the health-care related services accessible through the warehouse club.

This strategic move is significant because it could add another recurring revenue stream tied to member relationships, deepening Costco's engagement with older members and potentially supporting both membership retention and ancillary fee income over time if adoption scales.

Business model and revenue drivers

Costco Wholesale operates a membership-based warehouse club model where revenue is driven by a combination of merchandise sales and annual membership fees, with the latter contributing a stable, high-margin pillar to overall profitability.

Members pay an annual fee to access Costco's warehouses and online offerings, and in exchange receive everyday low prices on bulk items ranging from food and household goods to electronics, apparel and home improvement products, along with services such as fuel stations, travel packages and now prospective Medicare plans.

The company has historically relied on its ability to negotiate favorable purchasing terms, maintain a relatively limited assortment and run a no-frills store design to keep operating costs low, which supports competitive pricing and encourages members to renew, creating a virtuous cycle of traffic, sales and fee income.

Kirkland Signature as a representative product

One of Costco's most emblematic product lines is its Kirkland Signature private-label brand, which spans categories including food, household goods, vitamins, personal care and more, and is positioned as offering quality comparable to national brands at lower prices.

Kirkland Signature products are intentionally priced to deliver strong value while still contributing healthy margins, giving Costco an important lever for differentiating its assortment and driving member loyalty as shoppers learn that the private label often performs on par with or better than better-known branded alternatives.

This product strategy has also helped Costco manage inflationary pressures by controlling input costs and pricing decisions more directly, which becomes particularly relevant when considering how membership-based value propositions must remain compelling to support renewal rates and attract new members.

Stock level and closing context

As of the most recent completed Nasdaq trading session on August 18, 2026, Costco Wholesale stock closed at $961.35 in US dollars, with a daily gain of 0.82%, and a parallel CBOE quote showed $961.09 with a 0.79% advance and a 10.58% year-to-date increase.

Fact box

Company: Costco Wholesale Corp.

ISIN: US22160K1051

Ticker: COST

Exchange: Nasdaq

Price (as of August 18, 2026, 4:00 p.m. ET): $961.35 USD

Market cap: $1,773.84 billion (as of August 18, 2026)

Sector / Industry: Consumer staples - warehouse clubs and wholesale retail

Index membership: S&P 500

Next earnings date: September 24, 2026