Prologis has intensified its pursuit of SEGRO by asking the British warehouse landlord’s shareholders to press the board into negotiations over a proposed all-share combination valued at about £12.6 billion, or $16.9 billion when the approach was disclosed. The move shifts the contest from a private boardroom rejection toward a direct test of investor support, while stopping short of a firm takeover offer under the U.K. Takeover Code.

The U.S. group said on July 9 that constructive talks would allow the two companies to examine the full strategic and financial potential of a merger and give SEGRO investors the opportunity to consider a binding proposal. Prologis framed the appeal as a response to discussions with SEGRO shareholders and to the British company’s investor presentation a day earlier, in which management set out its case for remaining independent.

SEGRO rejected the renewed pressure within hours. Chairman Andy Harrison said the current proposal did not provide a basis for further engagement and characterized Prologis’s campaign as an attempt to acquire the company at an inadequate price. The board told shareholders to take no action, arguing that the proposal failed to capture the scarcity, quality and growth embedded in SEGRO’s portfolio and would dilute their exposure to its European logistics and data-center assets.

The dispute now centers on two competing definitions of value. Prologis is emphasizing the immediate premium, the scale of its global platform and the capital advantages of combining the companies. SEGRO is asking investors to look beyond the headline offer and assign greater value to its development pipeline, urban warehouse footprint, power-secured land and expected growth in data-center income.

Prologis first sent its indicative proposal to SEGRO’s board on June 16. The board rejected it on June 23, and Prologis publicly disclosed the approach the following day. Under the proposed exchange ratio, SEGRO shareholders would receive 0.084 new Prologis shares for each SEGRO share. Based on Prologis’s closing share price and the sterling-dollar exchange rate on June 23, the terms implied 925 pence per SEGRO share and valued the fully diluted equity at approximately £12.6 billion.

At that reference point, the proposal represented a 24.6% premium to SEGRO’s undisturbed closing price and a 31.4% premium to its three-month volume-weighted average price. It was also equal to SEGRO’s last reported European Public Real Estate Association net tangible asset value of 925 pence per share at the end of 2025. SEGRO investors would own about 10.5% of the enlarged Prologis after completion.

Because the consideration consists entirely of Prologis shares, however, its value moves with the bidder’s stock price and currency markets. SEGRO said on July 9 that the proposal was then worth 886 pence per share, below the original 925-pence headline value. That movement reinforces one of the central issues for investors: the premium is not fixed in cash, and the economic outcome depends on the market value of Prologis shares before and after any transaction.

Prologis’s argument is that the combined platform would be more valuable than the two businesses operating separately. The San Francisco-based company is the world’s largest industrial real-estate owner and has a broad presence across North America, Europe, Asia and Latin America. It says that global customer relationships, access to public and private capital, procurement scale and development capabilities could accelerate leasing and investment across SEGRO’s portfolio.

The bidder has placed particular emphasis on data centers, which have become a major source of real-estate demand as cloud computing and artificial-intelligence infrastructure expand. Prologis said it has a dedicated data-center team of more than 75 people, supported by development, energy and procurement teams. It cited a secured or advanced power pipeline of 5.8 gigawatts across roughly 30 projects and estimated that its longer-term opportunity could exceed 10 gigawatts.

That scale, Prologis argues, would allow the combined company to convert power availability into completed data-center projects more quickly and with less reliance on outside partners. It has criticized SEGRO’s use of project-level joint ventures, saying those structures transfer part of the potential upside to partners and reflect limits on the British company’s balance-sheet capacity. Prologis also points to its strategic-capital business, through which it manages assets alongside institutional investors and earns fees in addition to property returns.

SEGRO’s counterargument is that joint ventures are a deliberate way to share risk, access specialist operating expertise and expand without overburdening the balance sheet. The company announced a second 50:50 venture with Pure Data Centres Group on July 8 to develop a 48-megawatt fully fitted data center in Paris. It also said discussions were progressing over its first fully fitted data-center lease at Park Royal in London and that it had added 0.5 gigavolt-amperes to its strategic power bank.

The British group used its first-half trading update to reinforce the standalone case. It reported £53 million of new headline rent contracted during the first six months of 2026, including £27 million from the existing portfolio and £26 million from development lettings. Management said the current and near-term development pipeline had reached a record level, giving it a larger base from which to generate rental growth without surrendering control of the company.

SEGRO has also set out a longer-range earnings ambition. Management is targeting adjusted earnings of 50 pence per share by 2030, compared with 36.6 pence in the base period cited in its presentation. The board’s position is that supply-constrained urban locations, large distribution parks and powered sites in leading European metropolitan markets can generate value that is not adequately reflected in the current offer.

Prologis has challenged both the certainty and the timing of that plan. It said the 50-pence target implies compound annual growth of about 6.4% and would require faster progress in the later years, substantial investment and additional capital. The bidder also cited analyst consensus indicating weaker near-term earnings growth for SEGRO than for European logistics peers, arguing that the company’s public-market discount reflects structural constraints rather than a temporary valuation anomaly.

The disagreement therefore extends beyond price into capital allocation. SEGRO believes investors should retain concentrated exposure to a scarce European platform whose value could rise as developments are completed and data-center projects mature. Prologis is offering diversification into a much larger global real-estate investment trust with broader funding sources, but SEGRO shareholders would become a relatively small minority in the combined company.

For Prologis investors, the potential acquisition offers greater scale in some of Europe’s most supply-constrained industrial markets, including the United Kingdom, France and Germany. It would add urban assets near dense population centers, large logistics parks and data-center development sites. Those characteristics are difficult to replicate because zoning, land availability and grid access can restrict new supply.

The transaction would also carry execution risks. A combination of this size would require integration across countries, property teams, financing structures and development programs. The all-share format reduces the immediate cash burden for Prologis, but it would issue more than 114 million new shares under the disclosed exchange ratio. The eventual value created would depend on operating synergies, disciplined capital deployment and the ability to preserve local customer and government relationships.

The public campaign highlights a broader challenge for London-listed companies whose shares trade below management’s estimate of underlying value. A persistent discount can make high-quality U.K. assets attractive to larger overseas buyers, especially when the bidder can use its own equity as acquisition currency. Boards must then decide whether a premium to the market price adequately compensates investors for future growth that has not yet been recognized by public markets.

SEGRO’s defense is designed to convince shareholders that the discount can close through execution rather than a sale. Its presentation emphasized its century-long operating history, deep local expertise and a portfolio concentrated in urban, supply-constrained markets. The company also argues that Prologis’s proposal transfers too much of the future benefit from SEGRO’s development and power pipeline to the bidder’s existing shareholders.

Prologis, in turn, is trying to separate market value from standalone aspiration. Its message is that a board should not reject engagement solely because management sees greater theoretical value in long-dated projects. By asking shareholders to support talks rather than immediately endorsing the proposed exchange ratio, Prologis is seeking to create pressure for due diligence and negotiation without yet raising its terms.

That distinction matters under the U.K. takeover framework. Prologis’s announcements are statements of a possible offer, not a firm intention to bid. The company has until 5 p.m. London time on July 22 to announce a firm offer under Rule 2.7 of the Takeover Code or state that it does not intend to proceed, unless the Takeover Panel approves an extension. There is no certainty that a transaction will be proposed or completed.

The next stage will depend heavily on the views of SEGRO’s largest institutional shareholders. Support for discussions would not necessarily mean support for the current price, but it could weaken the board’s position that there is no basis for engagement. Conversely, strong backing for the standalone strategy would force Prologis to choose between improving the exchange ratio, maintaining pressure until the deadline or walking away.

Any increase would have to balance the expectations of SEGRO investors against dilution for Prologis shareholders. A higher exchange ratio would give the target’s owners a larger stake in the combined company and transfer more prospective synergies to them. Prologis must also consider whether the strategic value of SEGRO’s European portfolio and data-center pipeline justifies paying above reported net tangible assets in a property market still sensitive to funding costs and valuation changes.

For the wider market, the contest is a significant test of whether logistics real estate is entering a new consolidation phase. Warehouse landlords benefited from the expansion of e-commerce and supply-chain investment, but the sector’s next growth engine increasingly includes power, digital infrastructure and data-center development. Those projects demand capital, technical expertise and long planning horizons, favoring companies able to combine property ownership with energy access and institutional funding.

Prologis’s latest statement does not resolve the valuation gap, but it sharpens the choice facing SEGRO shareholders. They must assess an immediate, variable premium and a minority stake in the global market leader against the prospect of higher long-term value from an independent European platform. With the formal deadline approaching, the debate is moving from strategic presentations to investor influence—and potentially to revised terms.