I have been investing through United Traders for a year and a half. At first I only went into IPOs, but once I figured it out and realized that it worked, I started investing not only in IPOs, but also in private companies in the last rounds before they go public - what is called pre-IPO. In 2019, I participated in IPOs of 21 companies with an average return of 40% per annum.
So far, I've invested in 10 companies in the over-the-counter market, one of which, Lemonade, has already gone public, now I'm waiting for the lock up period to end.
To participate in investments, I use the desktop version of the United Traders website and track price movements in the mobile version. I follow company news in the official United Traders telegram.