A handful of Czech billionaires have quietly become some of the most active dealmakers in Europe, using fortunes built in energy, industry and finance at home to fund an outsized share of the continent's merger and acquisition activity.

The Czech Republic is a relatively small economy, but several of its wealthiest business figures have built international investment vehicles that reach far beyond the country's borders. Energy and industrial investor Daniel Kretinsky has assembled stakes across European media, retail and utility companies in recent years, while Michal Strnad has grown the defense and industrial group he leads into a major supplier with an increasingly international footprint. Karel Komarek's investment group has likewise expanded well past its roots in energy and gaming.

Much of this activity traces back to the wave of privatization that reshaped Central European economies in the years after the fall of communism, which allowed a small number of well positioned entrepreneurs to build large industrial and energy holdings relatively cheaply. Decades later, those holdings have become the financial base for aggressive expansion into Western European markets.

Analysts who track the region say Czech investors have been willing to take on deals that larger, more risk averse strategic buyers or private equity firms have shied away from, including assets in sectors facing regulatory uncertainty or public scrutiny. That appetite has made them frequent counterparties in complex, high profile transactions across the continent.

The trend has also drawn attention from regulators and rival bidders alike, as Czech buyers increasingly compete directly with established Western European conglomerates and private equity firms for the same targets.