Colliers (NASDAQ: CIGI) closes acquisition of Ayesa Engineering unit

Rhea-AI Filing Summary

Colliers International Group has completed its previously announced acquisition of Ayesa Engineering, the engineering division of Ayesa Group based in Seville, Spain. Ayesa is a global multidisciplinary engineering and project management firm providing technical consulting services across four continents.

More than 3,300 Ayesa professionals are joining Colliers, and its leadership has retained significant equity under Colliers’ partnership model to continue driving operations and growth. With this addition, Colliers’ engineering segment now operates in 23 countries with over 11,000 professionals, positioning it as a leading global consultancy in property and buildings, infrastructure and transportation, water, and environmental markets.

Colliers highlights the acquisition as strategically expanding the scale and resilience of its engineering business and reinforcing its partnership culture, where more than 700 operators are partners. The filing also notes that Colliers has $5.7 billion in annual revenues, 24,000 professionals, and $109 billion in assets under management.

Positive

• Strategic scaling of engineering segment: Acquisition of Ayesa Engineering adds more than 3,300 professionals, taking Colliers’ engineering business to over 11,000 professionals in 23 countries and broadening capabilities across infrastructure, water, environmental, and buildings markets.
• Aligned partnership model: Ayesa’s leadership retains significant equity under Colliers’ partnership structure, which management links to stronger alignment, entrepreneurial culture, and long-term value creation.

Negative

• None.

Insights

Equity analyst

Colliers materially scales its engineering platform with Ayesa deal.

Colliers has closed the acquisition of Ayesa Engineering, adding more than 3,300 professionals and expanding its engineering business to 23 countries with over 11,000 professionals. This significantly deepens its presence in infrastructure, water, environmental, and buildings end markets.

The leadership team of Ayesa is retaining significant equity under Colliers’ partnership model, aligning incentives for long-term growth. Management explicitly frames the transaction as enhancing the resilience of earnings and leveraging Colliers’ strategy of partnering with "exceptional operators" across global platforms.

Given Colliers’ disclosed scale of $5.7 billion in annual revenues, 24,000 professionals, and $109 billion in assets under management, integrating Ayesa looks strategically meaningful rather than bolt-on. Future filings may clarify the financial contribution of Ayesa and any integration-related costs or margin effects.

Key Figures

Ayesa professionals added: more than 3,300 professionals Engineering segment scale: over 11,000 professionals Engineering countries: 23 countries +4 more

7 metrics

Ayesa professionals added more than 3,300 professionals Size of Ayesa Engineering workforce joining Colliers

Engineering segment scale over 11,000 professionals Colliers Engineering workforce after acquisition, operating in 23 countries

Engineering countries 23 countries Geographic reach of Colliers Engineering post-transaction

Annual revenues $5.7 billion Colliers company-wide annual revenues

Total professionals 24,000 professionals Colliers total global workforce

Assets under management $109 billion Colliers company-wide AUM

Ayesa countries 21 countries Ayesa Engineering operating footprint before integration

Key Terms

foreign private issuer, Form 6-K, multidiscipline engineering, assets under management, +2 more

6 terms

foreign private issuer regulatory

"REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16"

A foreign private issuer is a company organized outside the United States that meets tests showing it is primarily foreign-controlled and therefore qualifies for a different set of U.S. reporting rules. For investors, that means the company files less frequent or differently formatted disclosures with U.S. regulators and may follow home-country accounting and governance practices, so buying its stock is like dining at a well-reviewed restaurant that follows its home kitchen’s rules instead of the local menu — you get access but should check what standards apply.

Form 6-K regulatory

"Form 6-K REPORT OF FOREIGN PRIVATE ISSUER"

A Form 6-K is a report that companies listed in certain countries file to provide important updates, such as financial results, corporate changes, or other significant information, to regulators and investors. It functions like an official company update or news release, helping investors stay informed about developments that could affect their investment decisions.

multidiscipline engineering financial

"Ayesa Engineering is a global multidiscipline engineering and project management firm"

assets under management financial

"24,000 professionals, and $109 billion in assets under management"

Assets under management (AUM) is the total value of all the investments that a financial company or fund is responsible for overseeing on behalf of its clients. It’s like a big bucket that shows how much money the firm is managing for people or organizations. A higher AUM often indicates a larger, more trusted company, and it can influence how much money they earn and the services they can offer.

project management financial

"multidiscipline engineering and project management firm headquartered in Seville"

Project management is the practice of planning, organizing and steering a time-limited initiative to reach a specific goal on schedule and within budget. For investors, strong project management increases the chance that new products, cost cuts or strategic changes actually deliver the promised benefits and returns, while weak execution can waste money and reduce profits. Think of it as a coach coordinating players and plays to win a game.

partnership model financial

"retained significant equity under Colliers’ unique partnership model"

AI-generated analysis. How Rhea-AI works. Not financial advice.

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FAQ

What did Colliers International Group (CIGI) announce in this Form 6-K?

Colliers announced it completed the acquisition of Ayesa Engineering. The deal adds a large multidisciplinary engineering and project management firm to Colliers’ platform, expanding its technical consulting capabilities and geographic reach across four continents under its engineering segment.

Who is Ayesa Engineering and what services does it provide for Colliers (CIGI)?

Ayesa Engineering is a global multidisciplinary engineering and project management firm. Headquartered in Seville, Spain, it delivers design, site supervision, and consultancy services across transportation, water, buildings and cities, and energy sectors, focusing on complex infrastructure projects for public and private clients.

How does the Ayesa Engineering acquisition change Colliers’ engineering business?

The acquisition significantly enlarges Colliers’ engineering workforce and global footprint. With more than 3,300 Ayesa professionals, Colliers’ engineering segment now has over 11,000 professionals operating in 23 countries, reinforcing its position as a leading global technical consulting and engineering consultancy platform.

What strategic benefits does Colliers (CIGI) highlight from acquiring Ayesa Engineering?

Colliers emphasizes expanded global scale and more resilient earnings. Management notes the deal strengthens operations in high-growth markets across Europe, Latin America, the Middle East, and South Asia, while leveraging Colliers’ partnership model to align Ayesa’s leadership for long-term growth and value creation.

How large is Colliers after the Ayesa Engineering acquisition?

Colliers reports substantial global scale following the transaction. The company cites $5.7 billion in annual revenues, 24,000 professionals worldwide, and $109 billion in assets under management, with its engineering segment alone now employing more than 11,000 professionals across 23 countries.

What notable projects demonstrate Ayesa Engineering’s capabilities within Colliers (CIGI)?

Ayesa contributes experience from several high-profile infrastructure projects. Examples include work on the Santiago Bernabéu Stadium transformation in Madrid, desalination and water facilities in Saudi Arabia, and metro systems such as the Bogotá Metro, underscoring its complex engineering expertise.

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER
THE SECURITIES EXCHANGE ACT OF 1934

For the month of May 2026
Commission File Number: 001-36898

COLLIERS INTERNATIONAL GROUP INC.
(Translation of registrant's name into English)

1140 Bay Street, Suite 4000
Toronto, Ontario, Canada
M5S 2B4
(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.
Form 20-F [   ]      Form 40-F [ X ]

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

		COLLIERS INTERNATIONAL GROUP INC.
Date: May 27, 2026		/s/ Christian Mayer
		Name: Christian Mayer
		Title: Global Chief Financial Officer & Chief Executive Officer, Commercial Real Estate

EXHIBIT INDEX

Exhibit		Description of Exhibit
99.1		Press release dated May 27, 2026.

EXHIBIT 99.1

Colliers completes acquisition of Ayesa Engineering

TORONTO, May 27, 2026 (GLOBE NEWSWIRE) -- Colliers (NASDAQ, TSX: CIGI), a global leader in professional services and investment management, announced today it has completed its previously announced acquisition of Ayesa Engineering S.A.U. (“Ayesa Engineering” or “Ayesa”), the engineering division of Ayesa Inversiones S.L.U. (“Ayesa Group”). Ayesa Engineering is a global multidiscipline engineering and project management firm headquartered in Seville, Spain, that provides technical consulting services across four continents. Ayesa’s leadership team has retained significant equity under Colliers’ unique partnership model and will drive the operations and growth of the business going forward.

With the addition of Ayesa Engineering’s more than 3,300 professionals, Colliers’ Engineering segment (“Colliers Engineering”) now operates in 23 countries with over 11,000 professionals, firmly establishing Colliers Engineering as a leading global consultancy delivering engineering, design, project management, and other technical consulting services across Property & Buildings, Infrastructure & Transportation, Water, and Environmental end markets.

“Ayesa is a highly strategic acquisition that meaningfully expands the global scale of our engineering business, strengthens the resilience of our earnings, and underscores the power of our partnership model,” said Jay Hennick, Global Chairman and Chief Executive Officer of Colliers. “Our ability to partner with exceptional operators and align them for long-term growth differentiates Colliers. More than 700 of our operators are partners in our engineering business, creating strong alignment, reinforcing our entrepreneurial culture, and driving long-term value creation. Looking ahead, we see significant opportunity to accelerate global growth within our engineering business, both organically and through acquisitions.”

“This acquisition strengthens our ability to serve clients in attractive, high-growth markets across Europe, Latin America, the Middle East and South Asia, while broadening our technical capabilities on a global scale,” said Elias Mulamoottil, Chief Investment Officer and CEO of Engineering at Colliers. “That expertise is reflected in Ayesa’s complex, high-profile projects such as the design and project oversight of the transformation of the Santiago Bernabéu Stadium in Madrid, the design of hundreds of desalination and water distribution facilities across Saudi Arabia, and the design and project oversight of several metro lines globally including the Bogotá Metro in Colombia.”

“Partnering with Colliers creates an exceptional opportunity for our professionals to become significant stakeholders in the business, reinforcing long-term stability and our focus on delivering the best outcomes for clients,” said Rosalío Alonso, Chief Executive Officer of Ayesa Engineering. “It also gives us the ability to leverage Colliers’ significant engineering operations in the U.S., Canada, and Australia, while benefiting from its more than 30-year track record of scaling global businesses and creating long-term value for all stakeholders.”

In connection with the transaction, Alantra acted as financial advisor and Uría Menéndez acted as legal advisor to Colliers. Baird and Arcano Partners acted as financial advisors and Pérez-Llorca and Weil, Gotshal & Manges acted as legal advisors to Ayesa Group and its owners, A&M Capital Europe and the Manzanares family.

  
Colliers Contacts
Elias Mulamoottil
Chief Investment Officer & CEO, Engineering
  
Christian Mayer
Chief Financial Officer & CEO, Commercial Real Estate
  
(416) 960-9500
   

About Colliers

Colliers (NASDAQ, TSX: CIGI) is a global diversified professional services and investment management company operating through three industry-leading businesses: Commercial Real Estate, Engineering, and Investment Management. With greater than a 30-year track record of consistent growth and strong recurring cash flows, we scale complementary, high-value businesses that provide essential services across the full asset lifecycle. Our unique partnership philosophy empowers exceptional leaders, preserves our entrepreneurial culture, and ensures meaningful inside ownership — driving strong alignment and sustained value creation for our shareholders. With $5.7 billion in annual revenues, 24,000 professionals, and $109 billion in assets under management, Colliers is committed to accelerating the success of our clients, investors, and people worldwide. Learn more at corporate.colliers.com.
        
About Ayesa Engineering
Ayesa Engineering is a leading multidisciplinary engineering and project management firm headquartered in Spain. With approximately 3,300 professionals operating in 21 countries, the company delivers innovative design, site supervision, and consultancy services across transportation, water, buildings & cities, and energy sectors. Ayesa Engineering is recognized for its technical excellence and ability to manage complex infrastructure projects for both public and private clients. Its approach combines deep sector expertise with a commitment to sustainability and cutting-edge solutions, making it a trusted partner in shaping the future of global infrastructure. For more information, visit http://www.ayesa.com. 

Filing Exhibits & Attachments

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Press Releases

• EX-99.1 PRESS RELEASE 6.4 KB