Previous 900 shooters are:

Four other bowlers as far back as 1931 preceded Glenn Allison with their 900 series, but none were in a sanctioned league or under tournament conditions.

Glenn Allison, La Habra 300 Bowl in La Habra, Calif, not approved. Sunday, July 1, 1982  

The following 900 series have been approved by ABC/USBC:

1. Jeremy Sonnenfeld, Lincoln, Neb., Feb. 2, 1997
2. Tony Roventini, Milwaukee, Nov. 9, 1998
3. Vince Wood, Moreno Valley, Calif., Sept. 29, 1999
4. Robby Portalatin, Jackson, Mich., Dec. 28, 2000
5. James Hylton, Salem, Ore., May 2, 2001
6. Jeff Campbell II, New Castle, Pa., June 12, 2004
7. Darin Pomije, New Prague, Minn., Dec. 9, 2004
8. Robert Mushtare, Fort Drum, N.Y., Dec. 5, 2005 UNOPPOSED!*
9. Lonnie Billiter Jr., Fairfield, Ohio, Feb. 13, 2006
10. Robert Mushtare, Fort Drum, N.Y., Feb. 19, 2006 UNOPPOSED!*
11. Mark Wukoman, Greenfield, Wis., April 22, 2006
12. P.J. Giesfeldt, Milwaukee, Wis. Dec. 23, 2006
13. Rich Jerome Jr., Baltimore, Dec. 22, 2008
14. Chris Aker, Winnemucca, Nev., Oct. 30, 2009
15. Andrew Teall, Medford, N.J., Nov. 2, 2009
16. Andrew Mank (R), Bellevue IL, March 18, 2010
17. William Howell III (L), Middletown, N.Y., Oct. 21, 2010
18. Matt Latarski, Medina, Ohio, Nov. 28, 2010 
19. Bob Kammer Jr., ?Crown Point, Ind., Jan. 8th. 2011
20. John Martorella Sr. (R), Greece, N.Y., April 12, 2012
21. Jimmy Schmitzer (R), Riverside, Calif., April 20, 2012
22. James Williams of Pawcatuck, Conn., April 16, 2013
23. Joe Scarborough of Charlotte, N.C., April 21, 2013, PBA50 Event