Publishers with an appreciable amount of content less than 100 years old on this site granted permission for the years listed in the table below. Those with over 1000 problems are:

• Mathematical Association of America (AMM CMJ FLANDERS MM PUTNAM SCHWEITZER TYCMJ USA)
• The Fibonacci Association (FQ)
• Baywood Publishing Company (JRM)

One large publisher denied permission in 1998. A second request in 2024 generated no response, so none of its problems appear on this site:

• Canadian Mathematical Society (CANADA CMB CRUX MAYHEM NOTES)

Other publishers with problems on this site are listed below.

• Springer (ABACUS MI)
• American Mathematical Association of Two-Year Colleges (AMATYC)
• Australian Maths Trust (AUSTRALIA)
• Austrian Mathematical Society (AUSTRIA POLAND)
• Mathematical Society of South Eastern Europe (BALKAN)
• Brazilian Mathematical Society (BRAZIL)
• United Kingdom Mathematics Trust (BRITAIN)
• Union of Bulgarian Mathematicians (BULGARIA)
• Chinese Mathematical Society (CHINA)
• University of Wisconsin (DELTA)
• Birkhäuser Verlag (ELEM)
• Bildung & Begabung (FRG)
• Monash University (FUNCT)
• Mathematical Association (GAZ)
• Hellenic Mathematical Society (GREECE)
• János Bolyai Mathematical Society (HUNGARY KOMAL KURSCHAK)
• International Mathematical Olympiad Board (IMO)
• Indiana Council of Teachers of Mathematics (ISMJ)
• Academy of Sciences of the Soviet Union (KVANT)
• St. Petersburg Mathematical Society (LMO)
• The MATYC Journal, Inc. (MACE)
• Nassau Community College (MATYC)
• Malaysian Mathematical Society (MENEMUI)
• University of Central Missouri (MJMS)
• National Council of Teachers of Mathematics (MSJ)
• Royal Dutch Mathematical Society (NAvW)
• Dutch Mathematical Olympiad Foundation (NETHERLANDS)
• Scandinavian University Press (NORMAT)
• Association of Mathematics Teachers of New York State (NYSMTJ)
• Ontario Association for Mathematics Education (OMG)
• University of Waterloo (OSSMB)
• University of New South Wales (PARAB)
• Kappa Mu Epsilon (PENT)
• Pi Mu Epsilon Fraternity (PME)
• Vuibert (RMS)
• Vandenhoeck and Ruprecht (SEM)
• Ministerstvo Prosveshcheniya RSSR (SHKOLE)
• Society for Industrial and Applied Mathematics (SIAM)
• Royal Spanish Mathematical Society (SPAIN)
• Applied Probability Trust (SPECT)
• School Science and Mathematics Association (SSM)
• Association of Teachers of Mathematics of New York City (SUM)
• Swedish Mathematical Society (SWEDEN)
• Artemas Martin (VIS)