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Contract Vehicles

Castro & Company has several contract vehicles designed to provide your agency with easy solutions for your contracting needs. You will not find a firm that is more responsive and dedicated to meeting your needs.

One Acquisition Solution for Integrated Services (OASIS)

gsaCastro & Company holds One Acquisition Solution for Integrated Services (OASIS). This Small Business Multiple Award Schedule, Indefinite Delivery Indefinite Quantity (IDIQ) contract provides Federal agencies with flexible and innovative solutions for complex services. The core disciplines of the contract include program management, management consulting, logistics, engineering, scientific, and financial services.

This contract:

  • Spans many areas of expertise and mission spaces
  • Spans multiple professional service disciplines
  • Allows flexibility for all contract types, including hybrids and cost-reimbursement, at the task order level
  • Allows ancillary support components, commonly referred to as Other Direct Costs (ODC), at the task order level

Castro Capabilities for GSA OASIS SB Pool 2:

We provide auditing, advisory, and accounting services to the Federal Government including the following specialized areas:

  • CFO Act and ATDA Financial Statement Audits
  • Audit Readiness and Remediation
  • OMB Circular A-123 Internal Control Compliance
  • Financial Management
  • Financial Statement Compilations and Analysis
  • Accounting and Reconciliation Assistance
  • Audit Liaison Services
  • Policy and Procedure Development

GSA OASIS Pool 2 Primary NAICS Codes:

  • 541211 – Offices of Certified Public Accountants
  • 541219 – Other Accounting Services

Key Personnel POC Information:

Castro’s Corporate OASIS Program Manager (COPM):
Thomas Castro, Managing Partner
Phone: 703-229-4440

Castro’s Corporate OASIS Contract Manager (COCM):
Gabe Fry, Proposal & Contracts Manager
Phone: 703-229-4440

For general OASIS inquiries, our OASIS team can be reached at:

Link to GSA OASIS SB Website: Click Here

Link to OASIS SB Contract (Sections A through J): Click Here

Link to OASIS SB Contract (Section J.1.): Click Here

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gsaCastro & Company holds GSA Professional Services Schedule GS-23F-0038U (formerly FABS). This Multiple Award Schedule provides Federal agencies with direct access to professionals that can thoroughly address the needs of the Federal financial community. PSS not only gives agencies access to a multitude of professional financial services, but it also provides agencies with the ability to customize the services to meet their specific needs. The PSS schedule allows for choice, flexibility, ease-of-use, and access to quality firms in the financial arena.

Special Item Number (SIN):

  • SIN 520-7 Financial & Performance Audits - Perform financial statement audits, financial-related audits, performance audits, and contract audits in accordance with Generally Accepted Government Auditing Standards (GAGAS) and non-GAGAS. An independent assessment of an audited entity's a) financial statements in conformity with generally accepted accounting principles, b) financial information, adherence to financial compliance requirements and internal controls, or c) organization or program performance to identify areas for improvement.
  • SIN 520-8 Complementary Audit Services - Other services performed by auditors including assist in developing questions for use at hearings, develop methods and approaches in evaluating a new or proposed program and forecast potential program outcomes.
  • SIN 520-11 Accounting - Transaction analysis, transaction processing, data analysis and summarization, technical assistance in devising new or revised accounting policies and procedures, classifying accounting transactions, special studies to improve accounting operations.
  • SIN 520-13 Complementary Financial Management Services - Assess and improve financial management systems, financial reporting and analysis, strategic financial planning, financial policy formulation and development. Devise and implement performance measures, conduct special cost studies, perform actuarial services, perform economic and regulatory analysis, assist with financial quality assurance efforts, perform of page


As a Minority-Owned Small Business, Castro & Company is able to receive sole-source contracts, up to a ceiling of $150,000 in accordance with FAR Subpart 19.5-Set-Asides for Small of page

General Contracting Information

North American Industry Classification System (NAICS) Codes:

  • 541211: Office of Certified Public Accountants
  • 541219: Other Accounting Services
  • 541611: Administrative and General Management Advisory Services
  • 541618: Other Management Advisory Services
  • 541990: Other Scientific and Technical Advisory Services
  • 561110: Office Administrative Services
  • 541519: Other Computer Related Services
cage code Cage Code: 4A8D6
d and b DUNS Number: 619053411

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GSA PSS Schedule GS-23F-0038U
A Minority-Owned Small Business

1737 King Street | Suite 250 | Alexandria, VA 22314
Main: (703) 229-4440 | Fax: (703) 859-7603

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