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Table of Contents

Lead Story

Tools to enhance ISO operations and sales


Industry Update

Isis set to launch nationwide

NAB banking on mobile POS

EC proposes interchange cap in EU

If MFA becomes law, what then?

GS bids farewell to one of our own

A hot time in the old town for MWAA


Different sales cultures are obstacles for most but not all

Patti Murphy
ProScribes Inc.

Selling Prepaid

Prepaid in brief

Prepaid to the rescue for Universal Credit

Southwest Airlines lands fraud victory


Is mobile POS for everyone?

Michael Gavin
Merchant Warehouse


Street SmartsSM:
Who moved my margins?

Dale S. Laszig
Castles Technology Co. Ltd.

Seven tips for a successful mass PCI compliance program: Part 1

Michelle Thompson
FirstMerit Bank NA

Legal issues for the SEO-minded ISOs, MLSs

Adam Atlas
Attorney at Law

Company Profile

ShopKeep POS Inc.

Payment Logistics LLC

New Products

Healthcare payments simplified

Priority MedPay
Priority Payment Systems

A platform for payment innovation

PayPros Innovo
Company: PayPros


To risk or not to risk


Readers Speak

Resource Guide


A Bigger Thing

The Green Sheet Online Edition

August 12, 2013  •  Issue 13:08:01

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Readers Speak

Seeking a list of top ISOs

At one time, I think you published a listing of ISOs - maybe the top 50 or something like that. Does that sound familiar, and do you know how I could get that information?

Doug Ainsworth Merchant Level Salesperson

Hi Doug,

We do not maintain a list of the top 50 ISOs. We do publish a guide each year in which many leading ISOs are listed. We do not rank them, however. To view the 2013 Buyers Guide, visit

Also, we publish a report on top acquirers in the December issue of our quarterly, GSQ, each year. Officially, only acquiring banks are acquirers, but people in the industry typically use the term "acquirer" to refer to the ISO channel in addition to acquiring banks.

The number of acquirers we discuss in GSQ varies, but it's usually 10. We rank them by processing volume. None of these companies is an acquiring bank, although some are merchant acquiring arms of banks.

Many on the list are involved in payment processing in addition to sales. Our 2012 Acquirers Report, located at, listed the top 10 merchant acquirers as:

  1. First Data Corp., $1.6 trillion (including $530 billion from its partnership with Bank of America Merchant Services)
  2. Chase Paymentech LLC, $560 billion
  3. Vantiv LLC, $400 billion
  4. Elavon Inc., $310 billion
  5. Global Payments Inc., $165 billion
  6. Total System Services Inc., $95 billion
  7. Heartland Payment Systems Inc., $80 billion
  8. WorldPay, $55 billion
  9. TransFirst, $32 billion
  10. iPayment Inc., $20 billion

The Nilson Report,, publishes a list of the top 50 U.S. acquirers each year. Unlike The Green Sheet, Nilson does not provide information for free.

Also, ranks the top 30 "credit card processing services" each month. It evaluates businesses based on an extensive list of criteria. Companies pay to be evaluated, but it appears the process is impartial. Thank you for relying on The Green Sheet. Best of luck in finding an ISO that suits your needs.


Notice to readers: These are archived articles. Contact names or information may be out of date. We regret any inconvenience.

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