My portfolio has two common stocks that are very risky and those are from the pharmaceutical industries. ADGI and RNXT increase more slowly than it falls. Both of these stocks are very risky because they can decline in heavy amounts in an economic downturn and cause a huge loss. I did learn that investing in pharmaceutical companies is riskier than investing in the communications and media industries like Netflix. In terms of diversification, there are a broad mix of investments I have made in my portfolio. I am holding a mix of automotive stocks, healthcare stocks, tech stocks, media, entertainment, and communications services stocks. Those companies are Tesla (TSLA), Adagio Therapeutics (ADGI), RenovoRx (RNXT), Snapchat (SNAP), and Netflix (NFLX). There is a huge rise in the demand for technological services like Snapchat, however, the arrival of TikTok has broken records and Snapchat is no longer the most popular and most used application as before. Snapchat stocks have been falling since my initial purchase. It has not increased during those weeks to reach my peak target price at least close to my purchase price. All of my stock purchases are common stocks in terms of security type.