Shares of BioNTech SE /zigman2/quotes/214419716/composite BNTX +1.33% fell 0.9% in premarket trading Tuesday, after CureVac N.V. /zigman2/quotes/219999729/composite CVAC -0.74% filed in Germany a patent infringement suit against the biotechnology company. CureVac said there were certain of its patents that were utilized in the manufacture and sale of BioNTech and Pfizer Inc.'s COVID-19 vaccine, Comirnaty. CureVac said while it doesn't seek an injunction, and won't take legal action to impede the production or sale of Comirnaty, it is seeking "fair compensation" for infringement of its patents. CureVac's stock rose 0.4% in premarket trading, and Pfizer shares slipped 0.8%. Year to date, CureVac's stock has tumbled 58.5% and BioNTech shares have shed 38.9%, while the iShares Biotechnology ETF /zigman2/quotes/206189322/composite IBB +1.74% has dropped 21.3% and the S&P 500 /zigman2/quotes/210599714/realtime SPX +0.40% has shed 19.7%.