** Protein sequencing firm Quantum-Si's QSI.O shares fall 5.4% to $4.06 premarket
** Company on Friday priced its $50 mln registered direct offering
** Company sold ~15.6 mln shares to certain institutional investors at $3.20/shr, a 25.4% discount to stock's last close
** QSI plans to use the proceeds for working capital and general corporate purposes
** QSI stock rose 34.3% in 2024
(Reporting by Arasu Kannagi Basil in Bengaluru)
((ArasuKannagi.Basil@thomsonreuters.com))