https://www.reuters.com/article/us-knowbe4-ipo/kkr-backed-knowbe4-valued-at-over-3-5-billion-in-strong-nasdaq-debut-idUSKBN2C92JW >Cybersecurity firm KnowBe4 Inc on Thursday joined a string of technology-focused companies that saw strong market debuts in the United States this year, after its shares opened nearly 25% above their offer price on Nasdaq.