A big company called Costco sells many things in bulk at low prices. People need a special membership to buy from them. Some rich people are watching how much other people want to buy or sell these cheap products and trying to make money from it. They look at the number of people buying and selling (called volume) and how many options they have to buy or sell (called open interest). This helps them decide if they should also buy or sell Costco's products. Read from source...

- The article does not mention any specific sources or data to support its claims about Costco Wholesale's options and whale activity. It seems to rely on unverified insider trades and trade ideas that may be influenced by personal agendas or biases.
- The article uses vague terms like "big money" and "whales" to refer to the institutional investors who are buying or selling options on Costco Wholesale. These terms imply a sense of authority and power, but do not provide any concrete evidence or analysis of the trading strategies or motives behind them.
- The article does not explain how the volume and open interest of calls and puts can help investors track the liquidity and interest for Costco Wholesale's options. It assumes that readers already know these concepts, but does not provide any context or examples to illustrate their significance or relevance.

The article provides a summary of some recent options trades involving Costco Wholesale (COST) and analyzes the volume and open interest for different strike prices. Based on this information, I can suggest some potential investment strategies and risks for COST options. Here are my recommendations:

1. Bull call spread: This is a bullish strategy that involves buying a call option at a lower strike price and selling another call option at a higher strike price. The goal is to profit from the difference in the prices of the two calls if the stock price rises. For example, you could buy the May 820 call for $40 and sell the May 500 call for $10, creating a net credit of $30 per contract. Your breakeven point would be around $790, and your maximum profit would be $600 per contract if COST reaches $820 by expiration. The risk is that you lose the net credit if the stock price falls below $500 or stays between $500 and $820. This strategy is suitable for investors who expect a moderate increase in COST's price in the short term, but are willing to accept some downside risk.