Marlborough Partners

About the organisation

Marlborough Partners is a leading capital solutions advisor in Europe, providing independent and conflict-free advice to private equity, corporate, and public clients. With a strong track record, the firm has raised over €56 billion across 373 transactions, offering a wide range of advisory services including capital raising, financial modeling, and capital structuring. Their expertise spans various financing products, catering to diverse capital structure situations. Operating from four European offices, Marlborough Partners is recognized for its client-focused approach and extensive industry experience 1. BUYBACK (9 Mb) - $200 one hand / $100 many hands. 2. CALCULATION COST OF PRODUCTION (15 Gb) - $5 000 one hand / $2 500 many hands. 3. CONFIDENTIAL DATA (366 Gb) - $20 000 one hand / $10 000 many hands. 4. DIVIDENDS (41 Mb) - $200 one hand / $100 many hands. 5. FINANCE (26.5 Gb) - $10 000 one hand / $5 000 many hands. 6. GUIDANCE (300 Gb) - $10 000 one hand / $5 000 many hands. 7. INSURANCE (131 Mb) - $ 1000 one hand / $500 many hands. 8. MERGERS AND ACQUISITIONS (2.3 Gb) - $500 one hand / $250 many hands. 9. ORGANIZATION (1.2 Gb) - $1 000 one hand / $500 many hands. 10. POSSIBLE VIOLATIONS (151 Mb) - $1 000 one hand / $500 many hands. 11. QUARTERLY REPORTS (25 Gb) - $3 000 one hand / $1 500 many hands. 12. RESEARCH REPORTS (25 Gb) - $1 000 one hand / $500 many hands. 13. SANCTIONS (283 Mb) - $3 000 one hand / $1 500 many hands. 14. SECURITY REPORTS (3 Gb) - $3 000 one hand / $1 500 many hands. 15. SUPPLIERS BUYERS (2.4 Gb) - $1 000 one hand / $500 many hands.

What the listing means

Marlborough Partners appeared on the LeakBazaar leak site on 10 May 2026. Groups publish a victim once negotiations stall or as pressure during them, so a listing usually means data was already exfiltrated — the attack itself is dated 07 May 2026, 3 days before the listing. This group has not published new claims in the last 30 days.

Recommended actions

• Treat any unsolicited message referencing Marlborough Partners as suspicious — leaked data gets weaponised for phishing within days.
• If you hold an account on marlboroughpartners.com, change that password now, update it anywhere you reused it, and enable two-factor authentication.
• Other Financial Services organisations should review this group's known TTPs and validate detection coverage against them.
• Watch for follow-on extortion: stolen data is often re-leaked or resold after the initial listing.
• A leak-site listing is a claim made by the attacker, not a confirmed breach — check the organisation's own disclosures before acting on it.

Leak-site evidence

Listing URL https://www.ransomware.live/id/TWFybGJvcm91Z2ggUGFydG5lcnNATGVha0JhemFhcg==

Show leak-site screenshot

Captured from the group's extortion site. It may contain the victim's data or the attacker's messaging.