| September 17th, 2021 Increased Buying Sends DXCM Upward Dear Reader, Yesterday, we looked at a Daily Price Chart of Blackstone Group Inc., noting the stock’s 24/52 Day MACD line is trading above the 18-Day EMA signaling a ‘Buy’. For today’s Trade of the Day we will be looking at an On Balance Volume chart for DexCom Inc. stock symbol: DXCM. Before breaking down DXCM’s OBV chart let’s first review which products and services are offered by the company. DexCom, Inc., a medical device company, focuses on the design, development, and commercialization of continuous glucose monitoring systems in the United States and internationally. The company offers its systems for use by people with diabetes, as well as for use by healthcare providers. Its products include DexCom G6, an integrated CGM system for diabetes management; Dexcom G7, a next generation G7 CGM system; and Dexcom Share, a remote monitoring system. Confirming a Price Uptrend with OBV The DXCM daily price chart below shows that DXCM is in a price uptrend as the current price is above the price DXCM traded at six months ago (circled). The On Balance Volume chart is below the daily chart. On Balance Volume measures volume flow with a single Easy-to-Read Line. Volume flow precedes price movement and helps sustain the price uptrend. When a stock closes up, volume is added to the line. When a stock closes down, volume is subtracted from the line. A cumulative total of these additions and subtractions form the OBV line. On Balance Volume Indicator ● When Close is Up, Volume is Added ● When Close is Down, Volume is Subtracted ● A Cumulative Total of Additions and Subtractions form the OBV Line Volume flow precedes price and is the key to measuring the validity and sustainability of a price trend. We can see from the OBV chart below that the On Balance Volume line for DXCM is sloping up. An up-sloping line indicates that the volume is heavier on up days and buying pressure is exceeding selling pressure. Buying pressure must continue to exceed selling pressure in order to sustain a price uptrend. So, On Balance Volume is a simple indicator to use that confirms the price uptrend and its sustainability. The numerical value of the On Balance Volume line is not important. We simply want to see an up-sloping line to confirm a price up trend. 
Confirmed ‘Buy’ Signal for DXCM Since DXCM's OBV line is sloping up, the most likely future price movement for DXCM is up, making DXCM a good candidate for a stock purchase or a debit spread trade. Let's use the Hughes Optioneering calculator to look at the potential returns for a DXCM debit spread. The Call Option Spread Calculator will calculate the profit/loss potential for a call option spread based on the price change of the underlying stock/ETF at option expiration in this example from a 7.5% increase to a 7.5% decrease in DXCM stock at option expiration. The goal of this example is to demonstrate the ‘built in’ profit potential for option spreads and the ability of spreads to profit if the underlying stock is up, down or flat at option expiration. Out of fairness to our paid option service subscribers we don’t list the option strike prices used in the profit/loss calculation. The prices and returns represented below were calculated based on the current stock and option pricing for DXCM on 9/16/2021 before commissions. | 
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