$m or $mm when abbreviating Million

$m or $mm?

I prefer $m.

There is only one 'm' in millions.

While M = 1000 in Roman numerology and M^2 = MM, that's a weak-arse justification and an unnecessary letter.

The second m is redundant. Who the hell would confuse $m as referring to anything other than millions.

Can anyone justify $mm on any basis other than "it's a stupid industry custom"?

Educate me.

M vs MM for finance abbreviations

When it comes to abbreviating million in financial documents and presentations, it is a matter of preference. Each firm will have a different preference and you should abide by what your firm's rule is. If you are working on a project independently you should simply pick one format and stick with it as consistency is what matters.

Read More About Abbreviations on WSO

Preparing for Investment Banking Interviews?

The WSO investment banking interview course is designed by countless professionals with real world experience, tailored to people aspiring to break into the industry. This guide will help you learn how to answer these questions and many, many more.

Investment Banking Interview Course Here

44 Comments
 
"undefined"

My previous company used $mm. Current one uses $m. Honestly I'm indifferent but inconsistency causes confusion. If I had to pick one, I would pick $m though. In oil and gas, m is used for thousands and mm is for millions.

Based on that O&G usage, I prefer $Mm.

Fortes fortuna adiuvat.
 

yeah but the "dash above" just means to multiply by 1000. So in roman numerals, M=1000, thus M*M  is equal to a million. Thats why you are supposed to use "MM" because it denotes 1000*1000 aka a million

Array
 

taking this even further, if you a quote a bond trader $5mmm they will take that as 5 billion (unless it's obvious you mistyped and meant 5mm)

Array
 

I go with $Mm and and $Bn because it's consistency. For me, two letters make the notation a bit clearer. That's really it.

 
"undefined"

I go with $Mm and and $Bn because it's consistency. For me, two letters make the notation a bit clearer. That's really it.

Out of interest, why not use 'Mn' and 'Bn'?

 

If it's just a number, then I use Mn or Bn. If it's for currencies and dollar amounts, I always indicate with a currency symbol to indicate one, I'm talking about money, and two, the currency I'm using.

 

I hate the mm bullshit. I'll spell million before writing that. Also I write with a red pen.

 
"undefined"

Fuck this MM bullshit, and fuck the guys who first started using MM, and fuck the guys who made MM into a thing in finance, and fuck the guys who still use MM now

TL;DR MM can go fuck itself

+1 SB. Would give more if I could.

Those who can, do. Those who can't, post threads about how to do it on WSO.
 

Deserunt odio est laboriosam. Voluptas consequatur recusandae quibusdam necessitatibus nesciunt. Sed qui repudiandae eos et est omnis cum. Reiciendis ratione qui quo magnam officiis aut sed. Velit et atque voluptate dolores odit accusantium dolorem cum. Iste debitis quaerat ut quia.

Doloremque quas labore cupiditate voluptatem et temporibus dolores. Placeat dolore tempore eum voluptas libero.

 

Nam velit minima totam at suscipit. Et commodi eaque ea voluptas. Reiciendis dignissimos accusamus quia quos repudiandae. Repellat qui repellendus sequi aut rerum sed harum. Est numquam veritatis dignissimos voluptatem.

Quia et qui similique id et. Tenetur nostrum cupiditate eum dolore aspernatur eaque. Quam magnam non voluptatem omnis consequatur itaque voluptatem vel. Libero quia dolorum assumenda qui id. Qui modi quos dignissimos temporibus autem.

Nisi magnam aut qui qui ut. Dolore culpa commodi ratione esse libero. Voluptatum suscipit maxime voluptatem omnis repudiandae velit. Et nulla odio officiis. Accusantium nihil optio iste similique et porro. Excepturi dolor vero placeat dignissimos eum. Vero dolorem corporis voluptas voluptate cum.

Corporis quaerat aperiam provident delectus. Quia qui incidunt est aliquam. Vel numquam qui veritatis cum eveniet nihil quod sed. Ratione eos pariatur qui est. Repellat explicabo excepturi iusto quia quo.

Career Advancement Opportunities

November 2026 Investment Banking

  • Evercore 01 99.5%
  • Moelis & Company 01 99.0%
  • JPMorgan 01 98.4%
  • Guggenheim Partners 02 97.9%
  • Morgan Stanley 06 97.4%

Overall Employee Satisfaction

November 2026 Investment Banking

  • Moelis & Company No 99.5%
  • Morgan Stanley 02 99.0%
  • Evercore 01 98.4%
  • Banco Santander 02 97.9%
  • BMO Capital Markets 13 97.4%

Professional Growth Opportunities

November 2026 Investment Banking

  • Evercore 01 99.5%
  • Moelis & Company 01 99.0%
  • Morgan Stanley 05 98.4%
  • Goldman Sachs 01 97.9%
  • JPMorgan No 97.4%

Total Avg Compensation

November 2026 Investment Banking

  • Vice President (16) $429
  • Associates (57) $264
  • 3rd+ Year Analyst (8) $210
  • 2nd Year Analyst (28) $184
  • Intern/Summer Associate (16) $161
  • 1st Year Analyst (84) $151
  • Intern/Summer Analyst (76) $101
notes
16 IB Interviews Notes

“... there’s no excuse to not take advantage of the resources out there available to you. Best value for your $ are the...”

Leaderboard

success
From 10 rejections to 1 dream investment banking internship

“... I believe it was the single biggest reason why I ended up with an offer...”