What happened
Shares of Spanish gas and electricity company Naturgy Energy Group SA fell more than 6% on Tuesday after BlackRock completed a full exit from the company by selling an 11.4% stake in an accelerated bookbuild. The stock fell roughly 7% at one point, placing it among the largest decliners in the European utilities sector during the session.
Deal details
In a filing with Spain's market regulator CNMV, the transaction was disclosed as 110.8 million shares priced at €25.20 apiece. That price represented a 5.6% discount to Monday's closing level and raised approximately €2.79 billion. The accelerated bookbuild structure rapidly introduced substantial selling pressure to the market, requiring the placement to be priced below the previous close to secure sufficient demand and clear the allocation.
Background on the seller
The disposal marks the end of BlackRock's stake in Naturgy, a holding it acquired through its purchase in 2024 of infrastructure investor Global Infrastructure Partners (GIP). GIP had initially taken a position in the Spanish utility in 2016. BlackRock had earlier reduced its exposure by selling about a 7% stake in December for around €1.7 billion, also executed at a discount.
Post-transaction ownership
Following the sale, Naturgy's shareholder register will be dominated by institutional holders and strategic investors. Spanish holding company Criteria will hold 26%, infrastructure fund IFM 15.5%, private equity firm CVC 13.8%, and the founding family's vehicle Alba 5%. Algerian state energy group Sonatrach will hold 4.1%, leaving an estimated free float of roughly 23%.
Analyst context
Analysts had warned of the potential for share pressure from large holdings. Bernstein, which maintains a "market-perform" rating and a €26.76 price target on Naturgy, had previously highlighted "stock overhang risk" as an ongoing concern after GIP's partial exit in December. UBS, with a "neutral" rating and a €27.30 target, noted the placement represented GIP's complete withdrawal from its decade-long investment.
Why the stock moved
The sharp intraday decline reflected the mechanics of a large accelerated block trade - a major shareholder rapidly offloading a substantial stake and pricing at a discount to entice purchasers and ensure the entire allocation is absorbed quickly. That dynamic can create abrupt supply shocks to available stock and accelerate downward price moves in the short term.
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Summary
BlackRock sold an 11.4% stake in Naturgy via an accelerated bookbuild at €25.20 per share, a 5.6% discount, raising about €2.79 billion. The sale drove a roughly 6-7% decline in the stock and completes BlackRock's exit following its acquisition of GIP in 2024. The shareholder base is now concentrated across Criteria, IFM, CVC, Alba and Sonatrach, with a free float near 23%.