# Sergey Ovsyannikov

No alias recorded

Pleaded guilty

Public record reviewed to August 23, 2026

Index entry last updated August 23, 2026

No role for this person is stated in the public record.

A conviction or guilty plea is recorded in this entry.

Everything on this page comes from cited public sources.

This entry records 1 action across 1 takedown, each traced to a cited source. At least one linked takedown was added in the extended pass and was not independently source verified. Where the record is silent, this page says so rather than filling the gap.

Legal summary

**Associated takedowns:** [3ve ad-fraud botnet disruption](https://takedownindex.org/takedowns/3ve-ad-fraud-botnet-disruption)

**Recorded role:** Role not stated

**Group segment:** Core operator

**Charging authority:** Not recorded

**Charging jurisdiction:** Not recorded

**Case number:** 18-CR-633 (ERK)

**Latest recorded action:** Pleaded guilty, September 2019

**Nationality:** Kazakhstan

**Country of residence:** Not established

- [Associated takedowns](https://takedownindex.org/people/sergey-ovsyannikov)
- [Legal history](https://takedownindex.org/people/sergey-ovsyannikov/legal-history)
- [Charges](https://takedownindex.org/people/sergey-ovsyannikov/charges)
- [Sources](https://takedownindex.org/people/sergey-ovsyannikov/sources)

## Sources

Every claim on this person's pages traces to one of the entries below.

Official announcements come first, then the reporting that supports individual details.

1 source cited across 1 recorded action

1. [1]
[Two Kazakh Cybercriminals Plead Guilty in Global Digital Advertising Fraud Involving Tens Of Millions of Dollars in Losses](https://takedownindex.org/sources/united-states-attorney-s-office-for-the-eastern-district-of-new-york-two-kazakh-)

United States Attorney's Office for the Eastern District of New York, September 25, 2019 Prosecutor release Source grade P1

Guilty pleas of Sergey Ovsyannikov (2019-09-24) and Yevgeniy Timchenko (2019-09-25) before Magistrate Judge Steven M. Gold; Ovsyannikov arrested October 2018 in Malaysia and extradited March 2019; Timchenko arrested November 2018 in Estonia and extradited February 2019

[Open source](https://www.justice.gov/usao-edny/pr/two-kazakh-cybercriminals-plead-guilty-global-digital-advertising-fraud-involving-tens)

Coverage note. Nothing on this page rests on an uncited claim. Where a source is silent on an outcome, this entry leaves the outcome unstated rather than inferring one. At least one linked takedown was added in the extended pass and was not independently source verified.