XLF Views 5 meanings found XLF is the ticker symbol for the Financial Select Sector SPDR exchange‑traded fund, and the same letters are used for an extensible log format, a laser research facility, and a gene‑related protein. Miscellaneous Xtreme Laser Facility XRCC4 like factor Regional Leaf Bay, Quebec, Canada Computing Extensible Log Format Business Financial Select Sector SPDR