To monitor the IPO performance of Mainline IPO stocks listed on both the Bombay Stock Exchange (BSE) and the National Stock Exchange (NSE), investors can follow these steps:

1. Research: Begin by identifying the Mainline IPO stocks that have been listed on both BSE and NSE. You can find this information on financial news websites, stock market portals, or directly on the BSE and NSE websites.
2. Track Listing: Keep track of the IPO listings on both exchanges. Note down the date of listing, issue price, opening price, and closing price for each IPO stock.
3. Performance Evaluation: Compare the issue price with the opening and closing prices to evaluate the performance of each IPO stock. Determine whether the stock has witnessed an increase or decrease in its value since listing.
4. Analyze Trends: Analyze the trends in IPO performance over time. Look for patterns such as initial spikes in price followed by corrections or sustained growth over the long term.
5. Stay Informed: Stay updated with the latest news, financial reports, and market analyses related to the Mainline IPO stocks. This will help you make informed decisions about buying, selling, or holding onto these stocks.
6. Utilize Tools: Use online stock market platforms, financial apps, or brokerage services that offer tools for tracking and analyzing IPO performance. These tools may provide charts, graphs, and other visual aids to help you understand the data better.

By following these steps and staying vigilant, investors can effectively monitor the IPO performance of Mainline IPO stocks listed on both BSE and NSE.