1. Avalara 2. ADP 3. Automatic Data Processing 4. Wolters Kluwer N.V 5. Thomson Reuters 6. Intuit 7. H&R Block 8. SAP SE 9. Blucora 10. Sovos Compliance 11. Vertex 12. Sailotech 13. Defmacro Software 14. DAVO Technologies 15. Xero 16. TaxSlayer 17. Taxback International 18. TaxCloud 19. Drake Enterprises 20. Canopy Tax 21. TaxJar