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ACS Group

ACS Group (Actividades de Construcción y Servicios, S.A.) is a Spanish multinational corporation specializing in the development, construction, and management of infrastructure projects worldwide. Founded in 1997 through the merger of OCP Construcciones, S.A. and Ginés Navarro Construcciones, S.A., the company has grown into one of the world's largest construction firms, with a focus on civil engineering, building, and services in sectors including transportation, energy, water, and industrial facilities. Headquartered in Madrid, Spain, ACS operates globally through key subsidiaries such as Hochtief in Europe and North America, Turner Construction in the United States, CIMIC Group in Australia and Asia-Pacific, and Dragados for major civil works. As of the first nine months of 2025, ACS reported consolidated revenues of €29.7 billion, up 12.5% from the prior year, with a backlog exceeding €89 billion. Full-year 2024 revenues were €41,633 million, a 16.5% increase from the previous year, driven by strong performance in its and divisions, alongside a record backlog of €88,209 million. The group employs 157,284 people across more than 50 countries, emphasizing sustainability, innovation, and health & safety, with investments in employee training and certification exceeding 90% coverage. Under the leadership of Executive Chairman , who has guided the company since its inception, and Chief Executive Officer , ACS continues to expand into emerging areas like , data centers, and digital infrastructure. In November 2025, ACS announced a €23 billion with BlackRock's to develop data centers globally. The company's portfolio includes iconic projects such as lines, airports, hydroelectric plants, and urban developments, contributing to economic progress in the regions where it operates. ACS is listed on the Stock Exchange as part of the index and maintains a commitment to , environmental responsibility, and long-term value creation for stakeholders.

Overview

Company profile

ACS Group, officially known as Actividades de Construcción y Servicios, S.A., is a multinational conglomerate specializing in development and services. It was founded in 1997 through the merger of Construcciones, S.A. and Ginés Navarro Construcciones, S.A.. The company's headquarters are located in , . ACS Group maintains a significant global presence, with operations in over 50 countries across , the , , and . As of 2024, the company employed approximately 157,284 people worldwide. Its core business areas encompass , concessions, industrial services, and , with a focus on projects, civil works, building, and emerging sectors such as digitalization and . ACS Group is publicly traded on the Stock Exchange under the ticker ACS.MC and is a component of the index. As of November 2025, its stood at approximately €20.21 billion. The company's major shareholders include with a 14.50% . serves as Executive Chairman, while Juan Santamaría Cases is the .

Leadership

Florentino Pérez Rodríguez has served as Executive Chairman of ACS Group since 1997, guiding the company's strategic vision while also holding the position of President of Real Madrid Football Club. Juan Santamaría Cases was appointed in May 2022. He was subsequently appointed CEO of subsidiary AG in July 2022. He concurrently serves as CEO of AG and oversees the group's global operations, including the integration of Hochtief's activities across international markets. The Board of Directors comprises key figures such as First Vice Chairman Isidro Fainé Casas, Second Vice Chairman Pedro López Jiménez, and Board Secretary José Luis del Valle Pérez, alongside other members including Lead José Eladio Seco Dominguez. The board operates through specialized committees, including the Executive Committee, Audit and Sustainability Committee, Appointments Committee, and Remuneration Committee, which support decision-making on oversight, appointments, compensation, and . ACS Group's governance framework adheres to the Spanish Corporate Governance Code, as recommended by the CNMV, emphasizing , ethical conduct, and in line with the company's . The Board of Directors Diversity and Member Selection Policy, approved in December 2024, promotes gender balance and diverse professional backgrounds to ensure balanced representation, with current board composition reflecting six female directors among its 14 members for enhanced gender diversity. International representation is supported through members with global experience in and sectors. The Audit and Sustainability Committee provides dedicated oversight for matters, including review of non-financial reporting and policy updates aligned with EU directives like CSRD. Leadership changes, such as Santamaría's 2022 promotion, reflect ACS Group's focus on internal talent development for continuity in executive roles, though specific details remain integrated into broader policies without public elaboration.

History

Formation and early growth

The ACS Group traces its origins to 1983, when a group of engineers acquired Construcciones Padrós, a mid-sized construction firm facing financial difficulties, marking the inception of what would become a major player in the sector. This acquisition laid the foundation for subsequent expansions, including the purchase of , a specialist in electrical and mechanical installations founded in 1919, which was later integrated to bolster industrial services capabilities. In 1993, the merger with OCISA S.A., a company established in 1948 with expertise in industrial , created Construcciones S.A., positioning it among Spain's top ten construction firms by enhancing its portfolio in and services. The pivotal moment came in 1997 with the merger of Construcciones S.A., Ginés Construcciones S.A., and Auxini S.A., forming Actividades de Construcción y Servicios (ACS), S.A., headquartered in . This consolidation unified diverse operations in , services, and concessions, enabling ACS to secure a stronger foothold in Spain's contracts for projects such as highways, railways, and urban developments. The early years emphasized domestic growth through strategic integrations, with reaching approximately €2.2 billion in 1997, driven primarily by activities amounting to €1.5 billion. A landmark expansion occurred in 2003 when ACS merged with Dragados S.A., acquiring through a share exchange valued at over €2 billion, which significantly broadened its expertise in major civil works like dams, tunnels, and ports. This move consolidated ACS's dominance in Spain's market, where public tenders formed the core of its operations. Initial international forays began in 2005 with the establishment of Dragados USA, Inc., a focused on North civil projects, though the group's primary emphasis remained on Spanish contracts during this period. By , ACS had achieved substantial scale through these domestic consolidations, with consolidated revenue surpassing €16 billion, reflecting robust growth fueled by Spain's boom and engagements in and sectors. This period of early development transformed ACS from a regional consolidator into Spain's leading group, setting the stage for broader ambitions while maintaining a focus on high-value .

Major acquisitions and international expansion

In 2011, ACS Actividades de Construcción y Servicios S.A. secured majority control of AG, a leading and services firm, by increasing its stake to 50.16% through a voluntary offer and share purchases. This transaction, which valued Hochtief at approximately €4.97 billion, marked a pivotal step in ACS's international expansion by providing access to established operations in and , regions where Hochtief held significant market positions through subsidiaries like in the US. The cleared the deal under merger regulation M.6020, emphasizing its role in enhancing ACS's global footprint without raising concerns. By 2015, ACS further consolidated its ownership by acquiring additional shares from Holding LLC, elevating its stake to 66.5% and deepening integration of Hochtief's diverse portfolio. Building on this foundation, ACS pursued high-profile concessions in the infrastructure sector. In October 2017, Italy's Atlantia SpA launched a takeover bid for Abertis Infraestructuras S.A., Spain's largest toll road operator, prompting ACS to enter a joint venture. By March 2018, ACS, through its subsidiary Hochtief, and Atlantia agreed to a collaborative acquisition via a new holding company, with ACS holding 30% and Hochtief 20% minus one share, valuing Abertis at around €16.5 billion. The European Commission approved the joint bid in July 2018 under merger case M.8894, but regulatory scrutiny from Spanish and other authorities, including antitrust reviews, led to delays and a restructuring of the original terms amid political tensions between Spain and Italy. The acquisition was completed in October 2018 under the restructured agreement, with Atlantia holding 50% plus one share, ACS 30%, and Hochtief 20% minus one share of Abertis. This transaction underscored ACS's ambition to lead in European transport concessions. The acquisition of Hochtief also facilitated ACS's deeper penetration into the region through the integration of , formerly Leighton Holdings Limited. In 2014, Hochtief completed its takeover by acquiring an additional 10.85% stake in Leighton for approximately A$1.14 billion, bringing its ownership to over 70% and enabling full operational alignment under ACS's oversight. Renamed in 2015, this entity became a cornerstone of ACS's operations, contributing expertise in , , and public-private partnerships (PPPs) with a backlog exceeding A$20 billion at the time. The integration streamlined management and strategy across ACS, , and CIMIC, fostering synergies in resource-intensive projects and enhancing ACS's position as a top global contractor in emerging markets. Parallel to these moves, ACS expanded its services arm through Cobra Instalaciones y Servicios S.A., focusing on and industrial projects. During the , Cobra scaled its portfolio in and developments, securing contracts for over 1 of capacity in and , including key photovoltaic plants under 's 2012 and 2017 renewable auctions. This growth positioned Cobra as a leader in () for clean energy, with international revenues rising by more than 50% between 2010 and 2018, driven by demand for sustainable infrastructure. These acquisitions reflected ACS's broader strategic pivot toward PPPs and concessions, particularly in , to diversify beyond traditional . The company emphasized long-term revenue streams from toll roads, s, and energy facilities, with investments exceeding €10 billion in PPP assets by the mid-2010s. In , ACS entered the market through Iridium Concesiones, winning bids for highway projects like the Atizapán-Atlacomulco in 2010 and expanding into concessions, which bolstered its regional presence amid growing public demand. This focus on PPPs not only mitigated cyclical risks in but also elevated ACS to a global leader in integrated infrastructure solutions.

Recent developments and challenges

In response to the economic pressures of the , ACS Group divested non-core assets in 2020 to streamline operations and bolster liquidity. Notably, the company sold its industrial services division, including Cobra IS, to Vinci for approximately €5.2 billion, allowing ACS to focus on core and infrastructure activities. Additionally, through its subsidiary , ACS facilitated the sale of a 50% stake in the mining services business Thiess to Elliott Management, further optimizing its portfolio amid global disruptions. In July 2022, ACS subsidiary Dragados faced a significant regulatory challenge when 's National Markets and (CNMC) imposed a €57.1 million fine on the company for its involvement in a bid-rigging related to public infrastructure projects in dating back to 1988-2006. The CNMC determined that Dragados, along with five other major firms, had colluded to manipulate tenders, leading to restrictions on the company's participation in certain public contracts for up to two years. This penalty highlighted ongoing antitrust scrutiny in the European construction sector and prompted ACS to reinforce its compliance frameworks. To strengthen its North American presence, ACS merged its Dragados North America operations with Flatiron Construction—a subsidiary of Hochtief, another ACS-controlled entity—in July 2024, creating Flatiron Dragados as an integrated civil engineering and construction unit. This combination, leveraging prior Hochtief acquisitions, positioned the new entity as the second-largest civil contractor in the US by backlog, enhancing capabilities in transportation, water, and energy infrastructure. The integration was completed in January 2025, enabling synergies in bidding, execution, and talent management across major US markets. ACS continued its expansion in 2025 with key acquisitions to bolster specialized services. In January, through its subsidiary , ACS acquired Irish mechanical and electrical engineering firm Dornan Engineering Group for €436 million, adding expertise in centers, pharmaceuticals, and advanced projects to its portfolio. Complementing this, ACS acquired Blueridge Transportation Group in September, securing full control over toll road concessions and enhancing its infrastructure investment capabilities. These moves aligned with ACS's strategy to capitalize on growing demand in high-tech and mobility sectors. Following the 2022 antitrust fine, ACS intensified its strategic focus on and to mitigate risks and drive long-term resilience. The company advanced digital tools such as BIM () and AI-driven across subsidiaries, improving efficiency and compliance in bidding processes. Concurrently, ACS's 2025 Sustainability Master Plan emphasized net-zero goals, renewable energy integration in projects, and reduced carbon emissions, with commitments to innovative solutions like sustainable materials and practices in development.

Business structure

Construction

The construction division of ACS Group encompasses civil engineering and building activities executed primarily through two key subsidiaries: Dragados, a wholly owned entity headquartered in Spain with global operations, and Hochtief AG, in which ACS holds a 79.1% stake as of August 2024. Dragados focuses on large-scale infrastructure and building projects across Europe, North America, and Latin America, while Hochtief operates extensively in Europe, the United States, and Australia, leveraging its subsidiaries such as Turner Construction in the U.S. and CIMIC Group in Asia-Pacific for integrated delivery. These subsidiaries enable ACS to manage complex contracts from design through execution, emphasizing efficiency and innovation in project delivery. The division specializes in heavy civil works, including highways, railways, airports, and high-rise buildings, where Dragados and apply expertise in transportation , developments, and structures. For instance, Dragados excels in tunneling and construction, while 's European and handle prestigious building projects alongside transport hubs. This specialization allows ACS to address diverse client needs in public and private sectors, with a focus on sustainable and resilient designs. In 2024, the engineering and construction segment recorded revenues of €9.5 billion, supported by a robust backlog exceeding €29 billion, reflecting strong demand in core markets. Approximately 91% of the group's overall revenues derive from international operations, with contributing 61% and 24%, underscoring the division's global footprint. ACS integrates advanced technologies such as (BIM) for enhanced project coordination and modular construction methods to reduce on-site time and waste, as demonstrated in initiatives like prefabricated components for airport expansions. The workforce supporting these activities consists of specialized teams in heavy , drawing from ACS Group's total of over 157,000 employees as of December 2024, with significant concentrations in technical roles for site management, , and safety compliance. This skilled labor force enables the execution of high-volume projects while prioritizing training in digital tools and sustainable practices.

Infrastructure

Iridium Concesiones de Infraestructuras, S.A., a wholly owned of ACS Group, specializes in the , financing, , operation, and maintenance of concessions through public-private partnerships (PPPs). Established as the primary vehicle for ACS's infrastructure investments, manages a diverse portfolio that includes toll roads, airports, hospitals, and water facilities, and has developed more than 150 projects globally, representing over €52 billion in capital value. These assets encompass developments and operational concessions across multiple sectors. The portfolio features key examples such as toll roads like the SH-288 Expressway in (operated until 2024) and the A13 highway in the UK, alongside water desalination facilities like the Concesionaria Desaladora del Sur in . Iridium's concessions also extend to transport infrastructure, including partial stakes in projects like Lima Metro Line 2 in , emphasizing sustainable and essential public services. In 2024, the subsidiary's segment assets totaled €4.8 billion, supporting ongoing operations and expansions. Revenue generation for relies on a model combining availability payments from entities and direct collections from users, ensuring stable cash flows under long-term concession agreements. In 2024, this approach yielded €172.7 million in revenue from concession activities, with many contracts structured as PPPs that allocate risks between public and private partners. Geographically, maintains a strong presence in for domestic concessions, while leveraging ACS subsidiaries like in the United States for projects such as highways and the , and CIMIC in for and . This focus spans , , , and , with operations in over 18 countries to diversify market exposure. Risk management is integral to Iridium's operations, featuring long-term contracts typically spanning 20 to 30 years with provisions for adjustments and performance-based incentives. The employs financial hedges for and fluctuations, alongside diversified project portfolios and compliance with frameworks like ICSID to mitigate geopolitical and operational risks. Many assets, such as toll roads, are constructed by ACS affiliates like Dragados before transitioning to operational phases under .

Industrial companies

The industrial companies of ACS Group provide specialized engineering and installation services for key sectors such as and , focusing on the development, , and of industrial infrastructures. Following the 2021 divestment of its primary industrial subsidiary Cobra IS to VINCI, ACS has strengthened its capabilities through strategic acquisitions, including Dornan Engineering Group in 2024 via subsidiary . Dornan Engineering, now integrated into ACS's operations, delivers electrical, mechanical, and HVAC installations, with expertise in projects including and facilities, as well as systems. The company also supports data centers and industrial facilities through advanced and solutions, emphasizing sustainable and efficient engineering. ACS's industrial services extend to high-voltage via subsidiary Electren, which handles the , , operation, and maintenance of electrical substations and lines, supporting renewable and . These services align with broader industrial needs in and gas, where engineering solutions facilitate safe and reliable installations. The group's industrial operations span multiple countries in and beyond, leveraging ACS's for projects in over 40 locations, with a strong emphasis on contracts and solutions that integrate for seamless project delivery. Innovations in these areas include technology-driven approaches to environmental and digitalization in systems. With more than 1,000 specialized engineers and technicians at Dornan alone, ACS's industrial division draws on deep technical expertise to execute complex, high-impact projects, contributing to the company's overall portfolio in advanced infrastructure.

Services

The Services division of ACS Group primarily operates through its subsidiary Clece, which specializes in facility management and social services with annual revenues of €2.03 billion in 2024. Clece provides a range of essential services, including cleaning, maintenance, catering, and elderly care, tailored for both public and private sector clients such as hospitals, schools, and transport hubs. These offerings encompass comprehensive facility support, from environmental services and waste management to personalized social care in residential centers and home settings. Clece's operations are concentrated in , , and the , where it serves key public infrastructures like airports and educational institutions. In the UK, through entities like Clece Care Services, it focuses on social and healthcare provisions, including support for dependent individuals. The company employs over 80,000 workers, enabling broad coverage across these markets. Since 2020, Clece has expanded its portfolio toward integrated service models, combining with social initiatives to enhance efficiency and client value, resulting in a 5.3% increase in 2024. This growth reflects a strategic shift toward holistic solutions, occasionally integrating support for ACS's industrial projects, such as those managed by . Clece emphasizes through green cleaning practices and energy-efficient maintenance protocols, implementing measures to reduce carbon footprints and promote use in its operations. These initiatives include eco-friendly and resource-saving technologies, aligning with broader goals while serving diverse client needs.

Minority investments

ACS Group's minority investments primarily focus on strategic stakes in infrastructure and concessions, enabling diversification while leveraging the company's expertise in and . The portfolio emphasizes and sectors, with key holdings including a 30% stake in the that controls , acquired jointly with Atlantia (now ) in 2018 for €16.5 billion. This investment extends ACS's presence in toll roads, managing over 8,000 kilometers across , , and . Additionally, ACS holds minority participations in other concessions such as Autema in (48 kilometers). These holdings align with ACS's broader approach to non-controlling interests in assets that complement its core operations in and services. The centers on building a portfolio exceeding €1 billion, targeting synergies in , logistics, and sustainable mobility to generate stable cash flows without full operational control. By pursuing partial stakes in high-growth areas like renewables and digital infrastructure, ACS aims to enhance returns through equity method accounting while minimizing . For instance, the strategy supports investments in and , integrating with subsidiaries like CIMIC for project development. Recent activities include the 2023 transfer of a 56.76% stake in the SH-288 in to , generating a and extending concession life, though the project reverted to state control in October 2024. In renewables, ACS advanced minority-linked exposure through CIMIC's 2024 commitment to the 700 MW Pacific Partnerships solar farm in , supplying clean energy to 280,000 homes. , under the joint structure, acquired a 51.2% stake in France's A-63 in early 2025, reinforcing European logistics ties. Governance in these investments involves non-controlling influence, such as board representation in , where ACS appoints the President and CFO, with CEO serving as Chairman since 2023. This setup ensures strategic alignment without majority voting power, as seen in the 2023 shareholder agreement renewing for long-term stability. These minority investments contributed approximately 11% to the group's EBITDA in 2024, with the infrastructure segment generating €281 million out of €2,456 million total, underscoring their role in diversified earnings. alone added €186 million to net profit, highlighting the value of concessions as an extension of ACS's capabilities.

Financial performance

Historical trends

Since its formation in , the ACS Group's has exhibited robust long-term growth, expanding from approximately €1.5 billion to €35.7 billion by 2023, primarily propelled by a series of strategic acquisitions that broadened its operational scale and geographic reach. This progression reflects the company's evolution from a domestic player to a global leader, with notable following key deals such as the 2007 acquisition of a controlling stake in , which integrated substantial international construction capabilities and contributed to diversification. Net profit trends have paralleled this expansion, rising from around €100 million in 2000 to €780 million attributable net profit in 2023, supported by consistent EBITDA margins in the 4-6% range that underscore amid cyclical industry conditions. These margins, typically hovering near 5%, have been maintained through cost discipline and high-margin project execution, even as revenue scaled dramatically. The company's order backlog has similarly strengthened as a indicator of sustained future revenue, growing from about €10 billion in the early 2000s to more than €73 billion by the end of 2023, providing visibility equivalent to over two years of work and buffering against market volatility. This accumulation highlights ACS's competitive positioning in securing large-scale infrastructure contracts globally. In terms of debt management, ACS maintained a net cash position of €400 million in 2023, reflecting prudent balance sheet stewardship and access to diverse funding sources. ACS has adhered to a shareholder-friendly since 2010, featuring annual increases and a consistent payout of around 50% of earnings, which has enhanced investor confidence while preserving capital for growth initiatives.

Recent results

In , ACS Group reported full-year of €41.6 billion, marking a 16.5% increase from the previous year, driven by robust performance in key international markets. Net profit reached €828 million, up 6.1%, while EBITDA grew 28.7% to €2.5 billion, yielding an EBITDA margin of approximately 5.9%. The company's expanded to €88.2 billion, a 19.9% rise, with international operations comprising over 90% of total sales and a significant portion of the exceeding 60%. For the first half of 2025, revenue surged to €24.1 billion, reflecting a 28.6% year-over-year growth, supported by strong contributions from North American subsidiaries. Net profit increased 8.1% to €450 million, and EBITDA rose 23.9% to €1.4 billion. The backlog stood at €89.3 billion by mid-year, up 3.1% overall and 11.8% on a comparable basis, bolstered by €31.7 billion in new awards. For the first nine months of 2025, revenue reached €36.8 billion, up 23.7% year-over-year, with EBITDA increasing 32% to €2.2 billion. The backlog was €89.3 billion at the end of September 2025, up 8.9% on a comparable basis. In the third quarter alone, net profit was €655 million, up 11.6% on a comparable basis. Key drivers of these results included accelerated U.S. expansion through the Hochtief-Flatiron merger and acquisitions like Dornan, alongside growth in data centers and sustainable infrastructure projects. For 2024, was 17.6%, reflecting efficient capital utilization amid international diversification. Looking ahead, ACS Group anticipates over 10% revenue growth in 2025, underpinned by a nearing €90 billion and a focus on high-margin sectors like digital .

Major projects

Infrastructure and

ACS Group's infrastructure and division has undertaken significant projects in water management, transportation, and utilities, leveraging advanced engineering to deliver large-scale solutions that enhance regional connectivity and resource . Through subsidiaries like Dragados and joint ventures, the company has contributed to and reservoirs that support , , and , as well as and systems designed for durability in challenging environments. One of the landmark achievements is the in , completed in 2002, where ACS participated in the development of the associated 240 MW hydroelectric as part of the broader Alqueva Multipurpose . This facility created Europe's largest artificial reservoir, with a capacity of 4,150 hm³ covering 250 km², enabling irrigation for over 110,000 hectares and contributing to sustainable water management in the arid . The project exemplified ACS's expertise in integrating with environmental considerations, promoting efficient water use amid regional challenges. In transportation infrastructure, ACS, through the TP Ferro joint venture with , constructed the – line connecting and , operational since 2009. Spanning 44 km, this mixed-use (passenger and freight) double-track line includes the 8.2 km Perthus Tunnel through the , representing a significant portion of the €532 million cost and facilitating seamless cross-border at speeds up to 320 km/h. The tunnel's design incorporated seismic-resistant features to withstand the region's tectonic activity, ensuring long-term structural integrity in a seismically active zone. ACS's involvement in dam construction extends to the Portugués Dam in , built by Dragados USA and completed in 2014 under a $180 million contract. This 67-meter-high (RCC) thick , the first of its kind constructed by the U.S. Army Corps of Engineers, provides flood protection for approximately 40,000 residents and supports sustainable water management by controlling the Portugués River's flow for and urban supply. Its innovative RCC technique reduced construction time and costs while enhancing seismic resistance, critical for Puerto Rico's earthquake-prone location, with the overall project valued at $386 million. Across these initiatives, ACS emphasizes technical innovations like seismic-resistant designs—evident in the Perthus Tunnel and Portugués Dam—and sustainable water management strategies, as outlined in the company's Water Efficiency Framework, which promotes reuse and treatment to support long-term resource conservation in utility projects.

Building and urban developments

ACS Group's building and urban development portfolio highlights its expertise in constructing landmark architectural projects that blend , , and urban integration. Through subsidiaries like Dragados and , the company has contributed to iconic structures that redefine cityscapes, emphasizing , energy-efficient designs, and cultural significance. These projects demonstrate ACS's capability in delivering complex, high-profile buildings that serve as enduring symbols of . The Palau de les Arts Reina Sofía in , , completed in 2005, stands as a premier example of ACS's involvement in cultural landmarks. Designed by architect , this and features a striking white, helmet-like exoskeleton made of curved steel and reinforced glass, spanning over 40,000 square meters with four auditoriums accommodating up to 4,000 spectators. ACS, through its Dragados in a with Necso, served as the main contractor, overseeing the intricate construction that integrated the building into the complex. The project showcased advanced engineering to achieve the structure's fluid, sculptural form while ensuring acoustic excellence and seismic resilience. In , the Torre Agbar, inaugurated in 2005, exemplifies ACS's role in innovative office architecture. This 39-story tower, rising 142 meters, was designed by in collaboration with b720 Arquitectos and features a dynamic facade composed of 4,500 glass panels that evoke the Montserrat mountains and a , incorporating over 60,000 LEDs for nocturnal illumination. Dragados, an ACS subsidiary, handled the core construction, managing the oval-shaped structure's challenging geometry and the integration of sustainable elements like natural ventilation and rainwater collection. The building serves as the headquarters for Agbar and has become a symbol of Barcelona's 22@ district, blending functionality with aesthetic symbolism. ACS further demonstrated its prowess in high-rise construction with the in , completed in 2008. At 250 meters and 52 stories, it was Spain's tallest building upon completion, forming part of the complex designed by . The tower's sleek, crystalline glass curtain wall and tapered form prioritize natural light and energy efficiency, with interiors housing premium office spaces for tenants including ACS itself. Dragados executed the construction, navigating the site's complex foundation requirements and incorporating advanced steel framing to achieve structural integrity against 's seismic activity. This project underscored ACS's leadership in elevating 's skyline as a global business hub. Venturing into renewable energy architecture, ACS participated in the in , , operational since 2016. This 110 MW concentrated solar power plant features a 195-meter central tower surrounded by 10,000 heliostats that focus sunlight onto a molten salt receiver for 24-hour and generation. Through its subsidiary , ACS served as the contractor, delivering the integrated system that includes salt storage tanks capable of producing 500 MW-hours of dispatchable power daily. The project highlighted ACS's integration of architectural scale with cutting-edge solar technology, supplying clean to and setting benchmarks for utility-scale renewables, though it faced operational challenges including bankruptcy in 2019 and a restart in 2021 under new ownership. ACS has also advanced sustainable urban integrations through mixed-use developments emphasizing certifications. A notable example is the 60-story mixed-use tower at 1072 West Peachtree in , , under construction since 2023 and topped out in November 2025, which incorporates residential, office, and retail spaces with Gold standards for , , and green materials. Dragados leads the project, ensuring compliance with high-performance building envelopes and on-site renewable features to minimize environmental impact. Such initiatives reflect ACS's commitment to creating vibrant, eco-friendly urban environments that promote and reduced carbon footprints in growing metropolitan areas.

Controversies

Antitrust and regulatory issues

In July 2022, Spain's National Markets and Competition Commission (CNMC) imposed a fine of €57.1 million on Dragados, S.A., a of ACS Group, for its participation in a long-standing in the sector. The infringement involved such as bid-rigging and market allocation among six major Spanish construction firms, distorting public tenders for infrastructure projects including roads, railways, and water management systems. These activities affected over 1,000 public contracts with a combined value exceeding €100 billion across the sector, though specific subsets of rigged tenders exceeded €2 billion in value. The CNMC investigation, initiated through inspections starting in 2014 and formalized in 2020 under file S/0021/20 (Obra Civil 2), uncovered evidence of coordinated meetings, shared sensitive commercial information (such as bidding strategies and technical proposals), and allocation of projects via joint ventures to minimize . The cartel operated from 1992 until May 2017, primarily targeting high-value public procurement in areas like ADIF () and ACUAMED (water infrastructure), in violation of Article 101 of the Treaty on the Functioning of the and Spain's . This case formed part of broader EU-wide scrutiny of construction s, with similar probes by national authorities in countries like and the revealing systemic bid manipulation in public works tenders. ACS Group responded by appealing the decision to Spain's , with the outcome pending as of . The company provisioned for the fine in its 2022 financial statements and enhanced its global , including updated antitrust training, risk assessments in processes, and internal reporting mechanisms to prevent future violations. The penalty led to a temporary dip in ACS Group's stock price immediately following the announcement, but the company faced no operational disruptions or bans from public contracting beyond a short period, allowing continued participation in major projects. Overall, the incident highlighted ongoing regulatory pressures in the , where cartels have historically inflated public spending by up to 20% in affected markets.

Other legal and ethical matters

In 2022, ACS Group's subsidiary faced significant labor disputes in the , where hundreds of foreign workers were left unpaid and stranded following the sale of its regional operations, leading to accusations of underpayment totaling hundreds of millions of dollars and highlighting vulnerabilities in immigrant worker protections across global supply chains. The company responded by engaging legal teams to process refund claims and address the humanitarian fallout, underscoring the need for robust oversight in labor practices. On environmental matters, ACS subsidiaries have encountered challenges, including an isolated 2018 involving environmental and impacts at project sites, which prompted enhanced risk assessments in . More recently, CIMIC's operations in have focused on emissions reduction, achieving a 13% decrease in Scope 1 and 2 emissions in 2024 compared to the prior year, alongside commitments to net-zero targets by 2038 for direct emissions, though specific fines for site violations remain undocumented in public records. Ethical governance concerns have centered on board diversity and transparency, with ACS implementing a Board Diversity Policy in to promote gender and age balance, amid broader industry scrutiny of reporting practices from onward. No major lawsuits on these issues were filed or resolved between and 2025, but the policy emphasizes ongoing improvements in disclosures to align with expectations. Regarding supply chain ethics, ACS conducts regular audits for human rights compliance in global projects, with 59.5% of suppliers in 2022 adhering to ethical, social, and environmental standards through adherence protocols. Post-2022, the group expanded training programs, including matrices for criminal compliance and prevention, integrated into its Policy updated in 2024. As a resolution to these challenges, ACS reinforced its commitment to the UN Global Compact principles in its 2023 reporting, embedding , labor standards, and measures across operations to mitigate ethical risks.

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