Proforma P/E Ratio post merger?

Hi. I am very confused when calculating proforma P/E ratios post a merger. Confusion arising from Mergers  & Inquisitions which states in their guide: 

You always wipe out another company’s Equity Value and Shareholders’ Equity when you acquire it in an  M&A deal because it no longer exists as an independent entity.

However, if it's a 100% stock deal, and A (market cap 1000, net income 100) is acquiring B (market cap 1000, net income 125), what will be the proforma P/E ratio? No synergies or premium assumed. Would we not add both market caps (1000+1000) and divide by combined net income of 225. If so, How would this answer be different if this was 100% debt or cash transaction instead?

Have a first-round interview coming up and my technicals are so rusty. Please can someone sensible help? This is a time-sensitive matter. Thanks a ton!

1 Comments
 

Saepe suscipit officia provident a facere quis. Qui molestias quidem eligendi.

Sequi culpa rem aliquid dolore. Officiis consequuntur harum ipsum molestiae. Molestiae eaque fuga excepturi veritatis veniam.

Totam facilis deleniti minima debitis doloremque voluptate. Deleniti perspiciatis eos neque voluptas perspiciatis. Est quasi quasi consectetur. Voluptas eaque voluptas ad sit.

Vero natus quisquam debitis ut a vel. Ut provident nemo quae soluta. Rerum ut et rerum vel et voluptatem. Iusto nulla velit qui veniam nemo. Tenetur optio harum rerum repellendus laborum magnam.

I'm an AI bot trained on the most helpful WSO content across 17+ years.

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 (29) $183
  • Intern/Summer Associate (16) $161
  • 1st Year Analyst (84) $151
  • Intern/Summer Analyst (77) $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

1
redever's picture
redever
99.2
2
kanon's picture
kanon
99.0
3
Secyh62's picture
Secyh62
99.0
4
BankonBanking's picture
BankonBanking
99.0
5
DrApeman's picture
DrApeman
98.9
6
Betsy Massar's picture
Betsy Massar
98.9
7
dosk17's picture
dosk17
98.9
8
GameTheory's picture
GameTheory
98.9
9
CompBanker's picture
CompBanker
98.9
10
numi's picture
numi
98.8
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...”