Solvay SA, the Brussels-listed specialty chemicals group, has disclosed that SIH Partners, LLLP crossed the 5% shareholding threshold on 29 October 2026, triggering a mandatory transparency notification under Belgian law. The notification, dated 30 October 2026 and published on 4 November 2026, confirms that SIH Partners holds a combined position of 5.35% when voting rights and equivalent financial instruments are aggregated. The disclosure was prompted by Susquehanna International Securities Limited crossing above the 5% threshold in voting rights held through financial instruments. Investors monitoring significant shareholding movements at Solvay will note this represents a material stake in a company reporting €4.3 billion in net sales in 2025.

Key Points

  • Solvay SA (Euronext Brussels and Paris: SOLB; reference 0NZR)
  • SIH Partners, LLLP crossed the 5% threshold upwards on 29 October 2026, per Belgian transparency legislation (Law of 2 May 2007)
  • Combined position: 0.22% direct voting rights plus 5.13% equivalent financial instruments, totalling 5.35%; denominator stated as 105,876,416 shares
  • Investors should watch whether further threshold crossings are disclosed or whether this position is subsequently adjusted

SIH Partners Crosses 5% Threshold at Solvay on 29 October 2026

The notification confirms that SIH Partners, LLLP, a Delaware-registered limited liability limited partnership headquartered at One Commerce Center, 1201 N Orange Street, Suite 715, Wilmington, Delaware, acquired or disposed of financial instruments treated as voting securities in Solvay, resulting in its combined holding crossing the 5% threshold upwards. The company disclosed that the notification reflects an update to a previously disclosed position, specifically linked to Susquehanna International Securities Limited crossing above the 5% level in voting rights held through financial instruments. The denominator used in the calculation is 105,876,416 shares.

Breakdown of SIH Partners' Voting Rights and Financial Instruments in Solvay

Of the total 5.35% aggregate position, the announcement states that direct voting rights account for 0.22%, while equivalent financial instruments represent 5.13%. This structure indicates that the majority of SIH Partners' economic exposure to Solvay is held through instruments rather than directly held shares carrying immediate voting power. Belgian transparency rules require disclosure when such combined thresholds are crossed, ensuring investors and the market are aware of significant positions regardless of whether they are held in physical shares or derivative-equivalent structures.

About Solvay: A Global Chemicals Group with €4.3 Billion in 2025 Net Sales

Solvay traces its origins to 1863 and the soda ash innovations of founder Ernest Solvay. Today, with around 8,400 employees worldwide, the group supplies specialty chemicals addressing applications including air and water purification, food preservation, healthcare, sustainable textiles, tyre manufacturing, and household cleaning. Solvay reported net sales of €4.3 billion in 2025 and is listed on Euronext Brussels and Paris under the ticker SOLB. The company has committed to achieving a carbon-neutral operation by 2050, underpinning its longer-term sustainability strategy across global markets.

Belgian Transparency Legislation and Solvay's Investor Relations Disclosure Process

The notification was issued in line with the Belgian Law of 2 May 2007 on the disclosure of significant shareholdings. Under this framework, holders crossing defined percentage thresholds must notify both the company and the regulator within a specified period. Solvay states that full transparency notifications and the complete chain of controlled undertakings through which the holding is effectively held are available on the Investor Relations section of its website. Investors may wish to review those materials for additional detail on the precise instrument types and chain of control underpinning SIH Partners' disclosed position.