Synergies is the magic word that gets thrown around during Mergers and Acquisitions (M&A). It’s the corporate version of the idea that two plus two equals five. In theory, when two companies combine, the new, larger entity can achieve more together than the two could have separately. This extra value—whether it comes from cutting costs, boosting sales, or financial wizardry—is what executives call “synergy.” It’s the primary justification for why an acquiring company is willing to pay a hefty price, often well above the target's market value. While the concept is sound, for a Value Investing practitioner, “synergies” is a major red flag. It’s a term often used to paint a rosy picture of a deal that might be more about empire-building than creating genuine value for shareholders. The history of business is littered with mergers that promised incredible synergies but ended up destroying value instead.
Companies and their investment bankers present synergies as the logical prize of a merger. These benefits typically fall into three main categories, each with a different level of plausibility.
This is the most common and believable type of synergy. When two companies merge, they often have duplicate departments and functions. Cost synergies are achieved by eliminating this redundancy. Think of it as corporate house-cleaning. Common sources include:
Because they are relatively straightforward to identify and quantify, cost synergies are the ones investors should take most seriously. If management can clearly map out where the savings will come from, there's a much better chance they'll actually happen.
If cost synergies are about playing defense, revenue synergies are all about offense. This is the idea that the combined company can generate more sales than the two standalone firms could. The logic sounds appealing:
The problem? Revenue synergies are notoriously difficult to achieve. They depend on customer behavior, competitive responses, and flawless execution—all of which are hard to predict. Management teams love to talk about revenue synergies because they sound exciting, but they are often a mirage. They are the hopeful dream that rarely comes true.
This is a more technical category of benefits that arise from combining financial structures. A larger, more diversified, and more profitable company is often seen as less risky by lenders and markets. This can lead to a lower Cost of Capital, meaning it becomes cheaper for the company to borrow money for future projects. Another common financial synergy involves taxes. If a profitable company buys a company that has accumulated losses, it may be able to use those losses to reduce its own tax bill, a benefit related to a Tax Loss Carryforward. While real, these financial benefits are often less significant than the operational synergies promised in a major deal.
“Synergy is a term that is most often used in business to explain an acquisition that otherwise makes no sense.” - Warren Buffett
The legendary investor Warren Buffett has famously noted that most acquisitions fail to live up to their hype, and synergies are often the bait in this trap. A management team, eager to grow its empire, may fall in love with a deal and then use wildly optimistic synergy projections to justify paying a massive Acquisition Premium—the amount paid over the target company's pre-deal market value. In many cases, these projected savings and revenue boosts never materialize, and the acquiring company's shareholders are left holding the bag, having massively overpaid. The promised “synergies” were little more than a fairy tale used to sell the deal to the board and to investors. Always ask: Is this deal truly about creating value, or is it about executive ego?
As a savvy investor, you shouldn't dismiss synergies out of hand, but you must analyze them with a healthy dose of skepticism. Here’s a simple checklist: