OSEN
OSEN LLC is a Hackensack, NJ-based plaintiff-side litigation boutique specializing in civil anti-terrorism cases under the ATA and FSIA, representing victims of state-sponsored terrorism and their families against sovereign defendants and banks, with over $1B in compensatory judgments obtained.
- Company typePrivate
- Founded2004
- HeadquartersHackensack, United States
- Headcount11–50
- GTM typeB2C
- OfferingServices
What OSEN does
OSEN LLC is a New Jersey-based plaintiff-side litigation boutique specializing in civil anti-terrorism and international human-rights cases, primarily brought under the U.S. Anti-Terrorism Act (ATA) and the Foreign Sovereign Immunities Act (FSIA). Founded in 2004 and led by Managing Partner Gary M. Osen, the firm represents victims of state-sponsored terrorism and their families in complex, multi-district litigation against sovereign defendants, banks, and corporations alleged to have facilitated terrorist financing or human-rights abuses. The firm maintains dual offices in Hackensack, NJ (headquarters) and New York City, with 11-50 employees.
OSEN's practice areas span ATA litigation, FSIA litigation, Iranian Sanctions Compliance advisory, and landmark restitution cases, with active or recently active matters including Karcher v. Iran (240+ plaintiff families), Arab Bank (297 plaintiffs, 2014 landmark verdict, 2016 Trial Lawyer of the Year), HSBC (385+ plaintiffs), SGBL (350+ plaintiffs), and the October 7 and Chiquita cases as co-counsel. To date, the firm has helped obtain over $1 billion in compensatory judgments.
The firm's business model is contingency-based: revenue is earned as a percentage (typically 25-40%) of judgments and settlements recovered for clients, supplemented by an emerging advisory stream from Iranian Sanctions Compliance work. Operating economics are event-driven and lumpy — tied to the resolution cadence of a small number of high-value cases — and the firm relies on co-counsel partnerships with Motley Rice, Sayles Werbner, and Turner & Associates to assemble the litigation capacity required for sovereign and mass-plaintiff matters.
OSEN firmographics
Firmographics- Name
- OSEN
- Legal name
- Osen LLC
- Website
- https://osenlaw.com
- Company type
- Private
- Founded year
- 2004
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- OSEN LLC is a Hackensack, NJ-based plaintiff-side litigation boutique specializing in civil anti-terrorism cases under the ATA and FSIA, representing victims of state-sponsored terrorism and their families against sovereign defendants and banks, with over $1B in compensatory judgments obtained.
- Ownership category
- akta.pro rank
OSEN industry classification
Industry- Product category
- Civil Anti-Terrorism Litigation Legal Services
- NAICS
- Offices of Lawyers (54111)
- SIC
- Services-Legal Services (8111)
- akta.pro primary industry
- White-Collar Defense & Investigations (BPAHAAAJ)
Keywords
Where OSEN is headquartered
LocationHeadquarters
- HQ city
- Hackensack
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
OSEN business model
Business model- GTM type
- B2C
- Offering type
- Services
- Cost components
- Personnel, Operations, Marketing or Sales, Technology or R&D
Revenue model
- Legal Services - Civil Anti-Terrorism Litigation: Osen LLC generates revenue through legal representation of terrorism victims in civil litigation against banks, corporations, and state sponsors of terrorism. Revenue is derived from contingency fees and/or hourly billing for complex litigation services.
Go-to-market motion1 record
Distribution channels1 record
Marketing channels3 records
OSEN product offering
Product offeringCore offering
Osen LLC is a civil anti-terrorism litigation law firm that represents American victims of terrorism and their families in lawsuits against financial institutions, corporations, and state sponsors of terrorism under the Anti-Terrorism Act and the Foreign Sovereign Immunities Act. The firm pursues civil judgments to recover compensation and to disrupt terrorist financing networks, and additionally handles Iranian sanctions compliance advisory and Holocaust/Nazi-era restitution matters.
Product overview
OSEN LLC is a civil anti-terrorism litigation law firm offering legal services rather than a technology product. The firm's core offerings include Anti-Terrorism Act (ATA) litigation, State Sponsors of Terrorism (FSIA) litigation under the Foreign Sovereign Immunities Act, Iranian Sanctions Compliance advisory services, and Landmark Restitution Cases representation for Nazi-era property claims. The firm specializes in terrorism financing cases against financial institutions, representing victims of Hamas, Hezbollah, and other designated terrorist organizations.
Differentiator
Problem solved
Functional benefit
Products and services
- Anti-Terrorism Act (ATA) Litigation Services Civil litigation services representing American victims of terrorism under the Anti-Terrorism Act, pursuing cases against financial institutions and corporations alleged to have provided material support to terrorist organizations such as Hamas, Hezbollah, and other designated groups.
- State Sponsors of Terrorism (FSIA) Litigation Services Legal representation for American victims of state-sponsored terrorism under the Foreign Sovereign Immunities Act, pursuing default and contested judgments against state sponsors including Iran, Syria, North Korea, and Cuba.
- Iranian Sanctions Compliance Advisory Advisory services on U.S. sanctions regulations, including CISADA, Iranian sanctions laws, terror-financing compliance reviews, and anti-money laundering compliance reviews for international businesses operating in or transacting with sanctioned jurisdictions.
- Landmark Restitution Cases Services Legal representation for individuals, families, and corporations seeking restitution for properties and business assets confiscated by the Nazi regime or former GDR, including looted art and cultural assets recovery such as the Sachs Poster Collection and the Wertheim case.
Quantifiable outcome
- First civil terror financing trial against a financial institution under the ATA - $100M+ settlement in Arab Bank case
- +2 more outcomes
Companies that use OSEN
Customer profileNamed customers3 records
Segments1 record
Ideal customer profiles1 record
OSEN technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
OSEN partnerships and signals
Strategic signalPartnerships
Four partnerships are on record, tiered core and minor.
- Turner & Associates, P.A.coreCo-counsel partnership in Karcher v. Iran cases representing more than 240 families of Americans who were victims of Iranian-supported terrorism in Iraq.
- Motley Rice LLCcoreCo-counsel in Karcher v. Iran cases and Arab Bank litigation, representing American terrorism victims.
- Sayles Werbner P.C.coreCo-counsel in Arab Bank trial team honored with 2016 Trial Lawyers of the Year award.
- Respected Law Firms (US and International)minorOsen LLC works with law firms in the United States and around the globe to tackle major cases, contributing unique knowledge of terrorist organizations and their financial exploitation.
Scale indicators7 records
Recent moves5 records
Expansion highlights5 records
OSEN competitors and assessment
Company assessmentDirect peers
- Motley Rice LLC: National plaintiffs firm co-counsel with OSEN on Karcher v. Iran and Arab Bank cases. Motley Rice runs the broader mass-tort/asbestos/state-sponsored-terrorism pipeline that OSEN specializes in, with overlapping defendants and plaintiff pools.
- Shurat HaDin – Israel Law Center: Israel-based civil rights and terror-financing litigation NGO led by Nitsana Darshan-Leitner. Pursues lawsuits against banks, corporations, and state sponsors supporting terrorism — directly comparable ATA/FSIA-style mandate from a complementary jurisdiction.
- Turner & Associates, P.A. Co-counsel with OSEN in Karcher v. Iran representing 240+ American families. Specializes in terrorism victim representation and FSIA litigation, making it a direct peer in the same niche docket.
- Sayles Werbner P.C. Dallas-based trial firm that served as co-counsel with OSEN on the Arab Bank trial team honored with the 2016 Public Justice Trial Lawyers of the Year. Comparable complex civil litigation practice against financial institutions.
- Perles Law Firm (Steven Perles): Boutique led by Steven Perles that has long represented victims of Palestinian terrorism in U.S. federal courts. Highly comparable niche practice to OSEN's ATA docket and frequently appears as opposing or co-counsel in terror-financing suits.
Broad incumbents
- Kreindler & Kreindler LLP: Established aviation disaster and complex tort firm historically active against state sponsors (e.g., Iran Air cases). Adjacent rather than direct — overlaps on FSIA and terrorism-victim representation but with a broader aviation focus.
- Gibson, Dunn & Crutcher LLP: Global elite defense firm; member Michael J. Radine joined OSEN from Gibson Dunn. Represents financial institutions defending terror-financing claims (including Arab Bank on appeal), making it a defense-side counterpart rather than a peer plaintiff firm.
- Hogan Lovells LLP: Global firm where OSEN member Dina Gielchinsky previously practiced. Advises financial institutions on sanctions, AML, and counter-terror financing compliance — adjacent to OSEN's Iranian Sanctions Compliance practice area.
Market position
Strengths4 records
Weaknesses5 records
Competitive moat4 records
Key risks6 records
Key highlights7 records
Customer concentration
OSEN social profiles
Digital presenceOSEN financial estimates
Financial estimateRevenue estimate
Valuation estimate
OSEN leadership team
Management profileNumber of profiles
Profiles7 records
OSEN funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
OSEN M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about OSEN
What does OSEN do?
Osen LLC is a civil anti-terrorism litigation law firm that represents American victims of terrorism and their families in lawsuits against financial institutions, corporations, and state sponsors of terrorism under the Anti-Terrorism Act and the Foreign Sovereign Immunities Act. The firm pursues civil judgments to recover compensation and to disrupt terrorist financing networks, and additionally handles Iranian sanctions compliance advisory and Holocaust/Nazi-era restitution matters.
Is OSEN a public or private company?
OSEN is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was OSEN founded?
OSEN was founded in 2004. It employs 11 to 50 people.
Where is OSEN based?
OSEN is headquartered in Hackensack, United States, in the North America region.
How does OSEN make money?
One revenue line is on record: legal Services - Civil Anti-Terrorism Litigation.
Who are OSEN's main competitors?
Direct peers on record are Motley Rice LLC, Shurat HaDin – Israel Law Center, Turner & Associates, P.A., Sayles Werbner P.C. and Perles Law Firm (Steven Perles). Broad incumbents are Kreindler & Kreindler LLP, Gibson, Dunn & Crutcher LLP and Hogan Lovells LLP.
Does OSEN have an API?
No public API is recorded for OSEN.
What industry is OSEN in?
OSEN's product category is Civil Anti-Terrorism Litigation Legal Services. Its primary akta.pro industry code is BPAHAAAJ, White-Collar Defense & Investigations. Its NAICS code is 54111 and its SIC code is 8111.