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Key takeaways:
- Acquirers that announce and report synergies outperform silent acquirers by 40 percentage points in three-year share price performance.
- Nearly one in three companies that announce synergies never provide quantified follow-through.
- Among acquirers that revise guidance, 95% of revisions are upward and most pair with accelerated timelines.
- Deals targeting synergy realization within one year deliver 71% total share price growth over three years.
- The PwC Synergy Credibility Framework identifies four disciplines: commitment, transparency, speed, and momentum.
The market rewards proven synergies—and punishes silence
Announcement creates credibility. Reporting compounds it. Silence destroys it.
Many of today’s M&A deals are justified by synergies. Acquirers often communicate them at or before close. Far fewer sustain that communication once the deal is done—and the gap between those who do and those who do not is one of the more consistent patterns in public-market M&A performance.
PwC analyzed 180 US public M&A transactions valued at $1 billion or more between 2016 and 2024 across six industries. Companies that both announced and reported synergies outperformed acquirers that failed to do so—what we call “silent acquirers”—by 40 percentage points in share price performance over three years, in both absolute terms and relative to the S&P 500. Speed in reporting synergy achievement amplifies that effect, and upward revisions widen it further.
While this relationship reflects correlation rather than causation—and stronger integrators may also be more disciplined communicators—the pattern is consistent across the sample and is not explained by any single factor. The ability to announce and sustain reporting typically reflects upfront rigor in planning, execution, and tracking. From the market’s perspective, reporting is the observable signal through which execution becomes credible.
We call this the synergy credibility gap—the measurable distance between what acquirers promise at announcement and what they demonstrate post-close. It is the gap the market is pricing and one that industry-leading integrators use to help create additional value.
The synergy credibility gap, by the numbers
Three statistics tell the story behind the gap:
40 percentage points. Companies that announce and report synergies outperform silent acquirers by roughly 40 percentage points in three-year share price performance, on both absolute and S&P-relative bases.
One in three announcers goes silent. Roughly 30% of companies that announce synergies never provide quantified follow-through and they underperform those that do. Among acquirers that do not announce, only about one in three ever report them later.
95% of revisions are upward. Among the 25% of acquirers that revise synergy guidance post-announcement, 95% of revisions are positive and 85% are paired with accelerated timelines. These companies outperform peers by 7–8 percentage points over three years.
Announcement establishes the story but reporting proves it
Every large acquisition comes with a value creation story—and many of today’s acquirers are happy to share it. Across our sample, roughly two-thirds of deals communicated synergy expectations in some form—58% announced and later reported, and 9% reported without prior announcement.
But this is where paths diverge.
Of those that announce, nearly a third never provide a quantified follow-through. Among companies that choose not to announce, only about one in three ever report synergies later. For a significant share of acquirers, synergy communication is treated as a one-time event and that choice creates a measurable credibility gap between what is promised and what is demonstrated.
The two disclosures play fundamentally different roles:
- Announcement establishes the value story—where value is expected to come from.
- Reporting proves the value story—whether that value is being delivered.
Companies that move from announcement to consistent reporting materially outperform those that stop at initial disclosure. Announcement earns initial credibility. Sustained reporting compounds it.
Follow-through is the real market signal
The performance gap between disclosure behaviors is material and consistent.
Over three years, companies that both announce and report synergies generate 56% total share price growth (16% CAGR), compared to 14% (4% CAGR) for those that neither announce nor report. Relative to the S&P 500, that is roughly a 40-percentage-point spread.
Companies that only announce synergies but do not report them still outperform non-communicators—but by a materially smaller margin (approximately 5 percentage points versus the S&P). Meanwhile, companies that quietly deliver without pre-announcing underperform the index by 12 points. The market does not reward unannounced execution; it rewards demonstrated follow-through on a stated commitment.
The synergy performance hierarchy is often clear:
- Announce and report → strongest performance
- Announce only → moderate outperformance
- Neither → weakest performance
It’s important to note that the market is not reacting to whether synergies exist; virtually all deals have them. Instead, the market is differentiating based on how clearly and consistently companies communicate delivery. As with any correlation, outcomes are also shaped by deal size, industry mix, transaction structure, and the underlying value creation thesis. But the reporting-to-performance relationship holds across the sample and is not explained by any single factor.
Reporting is the observable signal through which execution becomes credible. Silence, by contrast, is read as a negative signal—and often destroys credibility faster than underperformance itself.
Speed compounds credibility
Credibility is shaped not only by whether companies report, but by how quickly they deliver and how they update expectations over time.
Deals targeting synergy realization within one year deliver 71% total share price growth over three years (20% CAGR), compared to 21% or less (7% CAGR) for unspecified timelines.
One of the more telling signals comes after announcement. Among the 25% of acquirers that revise guidance, 95% of revisions are upward, and 85% are paired with accelerated timelines. These companies outperform peers by 7–8 percentage points over three years. Leading acquirers anchor conservatively, create early proof points, and beat expectations visibly over time.
The value creation mechanism is not speed for its own sake. Instead, it is what speed signals:
- Short timelines signal execution readiness—management has an actionable plan from Day One and is prepared to begin capturing value immediately, not just identifying opportunities.
- Short timelines create early proof points—enabling companies to demonstrate progress quickly and reinforce credibility through visible reporting.
- Long timelines introduce ambiguity and execution risk—positioning synergies as a multi-year “journey” exposed to shifting priorities, integration fatigue, and loss of momentum.
Bigger deals demand more and deliver more when backed by transparency
Large transactions are often viewed as higher risk. The data suggests the opposite: larger deals (more than 35% of buyer market cap) consistently outperform smaller ones, delivering an additional 60% total share price growth over three years, compared to 30–35% for mid-sized transactions (10–35% of buyer market cap), and 15–20% for smaller deals.
But size also changes the scrutiny environment. Analyst engagement on synergies during earnings calls rises from 15–20% in smaller transactions to 80% in large and transformational deals. Within the largest cohort, announcing synergies lifts analyst engagement from 55% to 83%. In large deals, the market is actively testing the credibility of the value creation story, and reporting discipline becomes the key differentiator.
Among large deals, acquirers that announce and report synergies deliver 60% total share price growth, compared to 48% for those that do not follow through—a pattern that holds on both absolute and relative bases.
By contrast, in mid-sized transactions (10–35% of buyer market cap), disclosure is decisive: deals that communicate synergies deliver 45% returns and outperform the S&P by 13 percentage points, while those that remain silent generate near-flat returns (4%) and underperform by 34 points.
In smaller deals (0–10%), disclosure still improves outcomes (26% versus 11%), but both cohorts underperform the S&P. Disclosure narrows the gap—but is not sufficient on its own to shift these deals into outperformance territory.
Large deals can indeed deliver strong outcomes, and the return on credibility rises with deal size.
Myths versus reality in synergy communication
In M&A disclosure, there is often a push toward more detail, more precision, and more frequency. Our analysis suggests that the market is more selective. Three widely held assumptions do not hold in the data:
- Myth: Greater precision at announcement builds credibility. Reality: The market does not require perfect precision upfront. A clear synergy target with honest uncertainty outperforms a precise target without follow-through. Credibility is built through delivery, not accuracy.
- Myth: More detail drives better outcomes. Reality: The market cares more about the total synergy number than how it is broken down. A clear headline number performs as well as detailed splits and gives management flexibility in how value is delivered.
- Myth: More frequent updates improve market confidence. Reality: Frequency is not the key variable, consistency is. Comparable, decision-useful updates that enable progress to be tracked outperform high-volume reporting that drifts in format or scope.
The market does not reward complexity in disclosure. It rewards credibility in delivery.
The PwC Synergy Credibility Framework
Drawing on this analysis and our integration work with acquirers across sectors, PwC frames credible synergy delivery around four disciplines:
1. Commitment—Announce a clear, defensible synergy target at or before close, even when uncertainty is high. The decision to announce creates an implicit contract with the market.
2. Transparency—Establish a consistent reporting cadence with comparable, investor-grade metrics across cost, revenue, and one-time dimensions. The performance gap between reporters and silent acquirers is the widest in our data.
3. Speed—Anchor to a one-year milestone. Design the integration plan to produce visible proof points early. The market prices time-to-value immediately.
4. Momentum—Leave room to raise the bar. Conservative initial guidance followed by upward revisions is the more rewarded pattern in our data.
Acquirers that demonstrate all four disciplines are often the ones sitting on the right side of the synergy credibility gap. Acquirers missing any one of them—and especially transparency—are often the ones sitting on the wrong side, regardless of how strong the underlying deal thesis is.
When reporting discipline is imperative
The data is clearest about where credibility matters more. PwC’s integration and reporting capabilities are highly valuable in the situations where the credibility gap is widest and expensive:
- Large and transformational deals—where analyst scrutiny approaches 80% and the market is actively testing the value story.
- Deals with elevated investor scrutiny—activist presence, proxy advisor focus, or recent underperformance.
- Situations where credibility is already fragile—prior deal underperformance, guidance misses, or contested strategic rationale.
- Complex synergy environments—multi-business-unit integrations, cross-border combinations, or deals where cost and revenue synergies should be tracked separately.
Implications for acquirers
M&A credibility is not established at announcement. It is built and tested over time. Five actionable principles follow from our analysis:
Treat synergy disclosure as a strategic commitment, not a press release. The decision to announce creates an implicit contract with the market. Plan for consistent, sustained reporting before you communicate.
Show your work consistently over time. The performance gap between reporters and silent acquirers is stark. What matters is not frequency, but clear, comparable visibility into delivery.
Anchor to near-term milestones. Multi-year synergy targets are expected—but they should be phased explicitly, with a clear view of Year 1. The market prices time-to-value immediately.
Build in room to raise the bar. Conservative initial guidance followed by upward revisions is one of the more rewarded patterns in our data. Establish credible expectations—then outperform them visibly.
Keep it simple. The market does not reward granularity for its own sake. A clear, sustained synergy narrative outperforms a detailed but episodic one.
Synergy communication is not just what you say at announcement. It is whether you are prepared to show your work—consistently, and over time.
How PwC helps close the credibility gap
Delivering on synergies is not only an execution challenge. It is a reporting and governance discipline. PwC specializes in building investor-grade synergy reporting frameworks—moving clients from one-time disclosure to sustained, credible delivery.
We support clients across the overall lifecycle:
- Define a credible value narrative at announcement. Align synergy targets with a defensible story for investors and a phased execution plan.
- Establish investor-grade reporting frameworks. Enable consistent tracking of synergies and integration costs across cost, revenue, and one-time dimensions.
- Support investor communication. Help management teams articulate progress, respond to analyst scrutiny, and maintain credibility over time.
This approach helps clients move beyond one-time disclosure toward the sustained, investor-grade reporting the market rewards—confirming that the value created through integration is clearly visible, understood, and recognized.
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