Amstel Securities
thegentlemenThis record tracks a ransomware attack claimed by the thegentlemen group against Amstel Securities. It collects the publicly disclosed attack details — sector, location and timeline — as published on the operator's leak site and indexed by Breach House.
Window Zero
EXPOSURE GAPWindow Zero is the time the breach stayed in the open before anyone said so — the gap between when the attack was first discovered on the operator's leak site (t1) and when it was publicly disclosed (t2). The wider this window, the longer victims, staff and customers were exposed with no warning.
Attack Summary
amstelsecurities.com zoominfo.com/c/amstel-securities-llp/353641962 Amstel Securities is a premier independent brokerage firm founded in 1989, connecting Asian and global markets with 35+ years of expertise in fixed income, equities, and derivatives. As a trusted agency and matched-principal broker, they specialize in Southeast Asian domestic currency bonds, high-yield credit, and G7 markets, serving institutional clients with unbiased execution and deep liquidity. Backed by strategic partnerships with BNY Mellon's Pershing for clearing and custody, they deliver secure, efficient solutions for wealth managers, family offices, and accredited investors worldwide
Leak Screenshots
SAMPLEProof-of-breach screenshots the operator posted from the stolen data. Previews are redacted and locked — the originals are available on HaveIBeenRansom.