As an AI language model, I don't have access to real-time data or the ability to browse the internet. Therefore, I cannot provide you with the updated information on the largest 20 companies in the Philippines as of January 2023.
However, I can guide you on how to find this information yourself. You can refer to financial news websites, stock exchanges, or market data providers in the Philippines. Some popular sources for this type of information include:
1. Philippine Stock Exchange (PSE): The official website of the Philippine Stock Exchange provides real-time and historical data on listed companies, including market capitalization and stock prices.
2. Bloomberg: Bloomberg provides comprehensive financial data, including market capitalization and stock prices for companies around the world. You can search for the largest companies in the Philippines using their platform.
3. Financial news websites: Websites like CNBC Philippines, BusinessWorld, or ABS-CBN News may have articles or sections dedicated to listing the largest companies in the Philippines with market capitalization and stock prices.
Remember, market capitalization and stock prices can fluctuate frequently, so it's best to refer to the latest available data.