How to Buy Costco Wholesale Corp (COST) Stock

Where to buy COST

13 brokers in our matrix offer COST. Verify availability and current fees with each broker before trading.

Broker	Commission	Fractional	Extended	Overnight	Options	OTC access
Charles Schwab (thinkorswim)	$0	Schwab Stock Slices, S&P 500 only, ≥ $5/slice, up to 30 at once		~1,130	$0.65	Most (3/5)
E*TRADE (Morgan Stanley)	$0 listed			~20	$0.65	Most (4/5)
Fidelity	$0	Stocks by the Slice, 7,000+ stocks/ETFs, from $1			$0.65	Partial (2+0)
Firstrade	$0	~4,000+ tickers, ≥ $5		~1,200	$0	Most (4/5)
Interactive Brokers	$0 (Lite) / per-share (Pro)			~10,000	per-contract pricing	Full
Merrill Edge	$0				$0.65	Most (3/5)
Moomoo	$0				$0	Limited only
Public.com	$0				rebate model	Limited only
Robinhood	$0	≥ $1 stocks, market cap ≥ $25M		~1,134	$0	None
SoFi Active Investing	$0				$0	Partial (1+2)
tastytrade	$0 stocks				$1.00 open, $0 close (capped at $10 per leg)	Limited only
TradeStation	$0 listed				$0.50 / $0.60	Most (4/5)
Webull	$0				$0	Limited only

24-Hour / Overnight trading

COST may be eligible for overnight trading via Charles Schwab (thinkorswim), Interactive Brokers, Robinhood, E*TRADE (Morgan Stanley), Webull, Moomoo, Firstrade. Each broker maintains its own eligibility list — confirm before placing an order.

About Costco Wholesale Corp

Founded in 1983, Costco Wholesale now operates a global chain of membership-based warehouse clubs, delivering high-quality goods and services at consistently low prices. As of its most recent fiscal year, Costco operated approximately 910 warehouses, serving more than 80 million members across its three geographic segments: Costco US (approximately 73% of total revenue), Costco Canada (13%), and Costco International (14%).Costco's core value proposition—quality products at unbeatable prices—has yielded consistently strong member renewal rates (93% in the US and Canada and nearly 90% internationally). About 55% of Costco's fiscal 2025 revenue came from its grocery offerings, and another 25% from general merchandise.

Sector

RETAIL-VARIETY STORES

Employees

341,000

Headquarters

ISSAQUAH, WA

Listed

1982-03-02

Market cap

$453.36B

Frequently asked

Where can I buy Costco Wholesale Corp (COST)?

COST is offered by 13 brokers in our matrix, including Charles Schwab (thinkorswim), E*TRADE (Morgan Stanley), Fidelity, Firstrade, Interactive Brokers. Compare commissions, fractional eligibility, and overnight availability in the broker matrix above.

Can I buy COST after hours or overnight?

Yes. COST is on the 24-hour eligibility list for Charles Schwab (thinkorswim), Interactive Brokers, Robinhood, E*TRADE (Morgan Stanley), and others. Overnight sessions route through ATSs with wider spreads and limit-orders only.

Does Robinhood offer COST?

Yes. Robinhood offers COST as a regular exchange-listed security.

Does Fidelity offer COST?

Yes. Fidelity offers COST as a regular exchange-listed security.

Does Webull offer COST?

Yes. Webull offers COST as a regular exchange-listed security.

Is COST optionable?

Yes. COST has listed options contracts. Per-contract pricing varies by broker — see the Options column in the matrix.

Is there a tokenized version of COST?

Not in our current dataset. The tokenized stock universe (Kraken xStocks, Binance Alpha/Ondo, Robinhood EU, Hyperliquid HIP-3) is expanding quickly — we refresh quarterly.

Can I buy a fractional share of COST?

Yes. Multiple brokers in the matrix support fractional shares for COST — see the Fractional column above for per-broker eligibility and minimums.