Cementos Bio-B

What it is

Founded in 1957, Cementos Bío Bío (CBB) is one of Chile’s leading industrial companies, making cement, lime, and concrete — and supplying the copper and lithium mining sectors that are the backbone of the regional economy, as well as construction markets in Chile and Peru.

The group runs four cement plants in Chile, one in Peru, two lime plants in Chile, one in Argentina, and 27 concrete plants across Chile. Lime — the less glamorous of its two business lines — is the quietly strategic one: it is a chemical necessity in extracting gold, silver, copper, and lithium.

Who owns it

Carmeuse Group, a Belgian industrial company, acquired a 97.1% controlling interest in CBB through a public tender offer finalised on 11 September 2025. The deal was valued at approximately US$505 million.

The selling families — Briones, Rozas, and Stein — held roughly 64.6% between them before the offer; the Briones family alone, through Inversiones Cementeras Ltda., controlled around 44%, making them the historical anchor of the company. The Peruvian cement group Yura also held 20% prior to the acquisition.

Who runs it

Iñaki Otegui Minteguía was appointed CEO (gerente general corporativo) by the board after his predecessor’s departure. He holds a degree from the University of Chile and an MBA from Universidad Adolfo Ibáñez.

Carmeuse has committed to keeping CBB’s existing local management team in place. The CFO-level function was held by Marcelo De Petris Zanetta as head of corporate administration and finance, though the company has not made a fresh disclosure since the ownership change; that position is not confirmed in available post-acquisition sources.

The money, in plain words

CBB keeps about 9 cents of profit from every peso of sales — a net profit margin of 8.9%, solid for a cement and lime manufacturer exposed to commodity input costs. Revenue has grown every year, rising 3.1% in the most recent annual period (our calculation), from CLP 359.6bn (US$391 mn) to CLP 370.5bn (US$391m to US$403m).

For every peso of shareholders’ equity in the business, CBB earns back about 12 cents a year — a return on equity of 11.8%, respectable in a capital-heavy industry. The balance sheet carries no disclosed financial debt and holds CLP 43.1bn (US$46.9m) in cash, giving it a net cash position that is comfortable (our calculation).

What it is doing now

Carmeuse announced its intention to cancel CBB’s listing on the Santiago Stock Exchange, ending a market presence that dates to 1965. The board called an extraordinary shareholder meeting for 17 December 2025 to vote on deregistering the shares from the financial market regulator’s (CMF) registry.

Alongside that process, Carmeuse launched a buy order for the remaining shares — up to 7.5 million — at CLP 1,730 (US$2)per share, seeking to acquire the last fraction still held by institutional investors and individual shareholders. Once complete, CBB will become a fully private subsidiary of the Belgian group.

What to watch

• Delisting completion. The cancellation of CBB’s share registration ends a public market chapter stretching back to 1965. Once gone, price discovery and quarterly disclosures disappear with it.
• Mining exposure. CBB is a key lime supplier to Chile’s copper and lithium sectors. Any slowdown in mining investment hits its most profitable segment directly.
• Carmeuse integration. Carmeuse says it will work closely with CBB’s existing management to ensure continuity and accelerate growth. Whether it brings new capital for capacity expansion — or simply extracts cash — is the open question for Chile’s construction and mining supply chains.
• Construction cycle. Chile’s housing and infrastructure market drives cement volumes; interest rates and government infrastructure spending are the dials to watch.

This is news, not investment advice.