This article originally appeared as part of ongoing coverage in our premium Motley Fool Stock Advisor service ... we hope you enjoy this complimentary peek!

What's happening? 
Shares of Post Holdings (NYSE:POST) jumped more than 17% Monday after the food giant announced select preliminary fiscal first-quarter 2015 results and another large acquisition. 

Why it's happening 
First, quarterly net sales are now expected to be approximately $1.074 billion, which should lead to adjusted earnings before interest, taxes, depreciation, and amortization of $126 million to $128 million. And while revenue is roughly in line with analysts' expectations, Post previously told investors to expect adjusted EBITDA between $115 million and $120 million.

In addition, Post announced it has agreed to acquire privately owned MOM Brands for $1.15 billion on a cash-free, debt-free basis. That will include $1.05 billion in cash, and the issuance of 2.45 million shares of Post common stock. MOM Brands (or Malt-o-Meal Brands) has a broad product portfolio that targets the value segment in branded ready-to-eat cereal, private label, and hot wheat and oatmeal. According to Post's PR, adding MOM Brands to its repertoire will "solidify Post's position as the third-largest provider of RTE cereal with a combined dollar share of approximately 18%."

For the fiscal year ended Dec. 27, 2014, Post estimates MOM Brands achieved adjusted EBITDA of between $119 million and $121 million. And after one-time costs of between $70 million and $80 million, the acquisition should create around $50 million in run-rate cost synergies by the third full fiscal year following its close. Post will also enjoy a tax benefit with a net present value of roughly $200 million.

"For Post, this is the right move, at the right price, in the right category," added Post CEO Rob Vitale. "After a century of spirited rivalry between MOM Brands and Post, we now look forward to combining our strengths."