Leong Apex S.C.

Leong Apex S.C., a Chicago-based sole proprietorship operated by King S. Leong, provides regional medical consultant services to the Social Security Administration, conducting medical reviews of disability claim case files to support SSA's disability benefits adjudication and determination processes. The vendor operates exclusively as a prime contractor (100% of recent awards) with no subcontractor footprint and competes full-and-open with no set-aside designations across its entire award portfolio.

Leong Apex S.C.'s customer concentration is absolute: all 19 recent awards fund Social Security Administration programs, accounting for $6.6 million in combined potential value. Work is performed in the Chicago, Illinois area, covering SSA Region 5 (Midwest/West Region). The vendor's capability portfolio is narrowly specialized — licensed medical professionals conduct detailed assessments and systematic examinations of disability claim documentation under PSC codes 6820 (Medical/Psychiatric Consultation) and 6850 (Other Medical Services), grounded in NAICS 621111 (Offices of Physicians except Mental Health Specialists). Recent representative call orders include a $297,920 firm fixed-price BPA call awarded July 1, 2026, for regional medical consultant services through June 30, 2027; a $306,900 call order dated June 27, 2025, running through June 30, 2026; and a $245,000 call order from July 1, 2023, through April 30, 2024.

The vendor sits on two active BPA vehicles with SSA. The larger vehicle, Blanket Purchase Agreement 28321321AC0540021, anchors 11 task orders carrying $2 million combined potential value and runs through January 31, 2026. A second BPA, 28321318AC0540003, carries 6 task orders valued at $305 thousand. Cumulative call orders under the master BPA structure have exceeded $1.3 million to date, with $2.3 million obligated across the 19-award portfolio as of the snapshot date (34% of combined potential value).

Activity has remained flat at two awards per year over the past five years (2022 through 2026). One award ($298 thousand) faces ultimate completion within the next twenty-four months, creating modest recompete exposure. The vendor's revenue scale and federal footprint are concentrated and specialized: a single-customer, single-agency supplier with deep penetration in SSA's disability medical review operations but no secondary customers, parent vehicles, teaming relationships, or subcontract activity. The Subchapter S structure and lack of any SBA designation (8(a), HUBZone, SDVOSB, WOSB, or other certifications) position this as a full-and-open commercial medical services provider to federal government rather than a set-aside-eligible firm.