What is a preferred supplier list (PSL) in recruitment? How agency panels work

A preferred supplier list (PSL), also called an agency panel or approved supplier list, is the short list of recruitment agencies an employer has approved to fill its roles on pre-agreed terms: fees, guarantee or rebate periods, payment terms and service levels. Hiring managers are expected to use those agencies, or the internal recruiting team, rather than any agency that calls. PSLs exist for permanent and contract hiring, are often split into tiers, and are reviewed periodically, commonly through a tender. In the UK public sector the equivalent is a framework; for example, the Government Commercial Agency's executive search framework RM6394 runs from August 3, 2026 to August 2, 2029.

If you are an employer choosing agencies for a single search, start with how to choose a recruiting agency. If the client runs a contingent-labor program, see MSP vs. VMS in staffing. This page is about the panel itself, from both sides.

How does a preferred supplier list work?

1. Selection. Talent acquisition, often with procurement, invites agencies to pitch or tender, scores them and picks a small number per role family.
2. Terms. Each agency signs the same master terms, sometimes with fee schedules that differ by agency or tier.
3. Release. When a role opens and the internal team decides to use agencies, it goes to the panel, either to all at once or in tier order.
4. Submittals. Agencies send candidates through the agreed channel, often a portal or the employer's ATS, with ownership decided by who submitted first.
5. Review. The employer tracks each agency's results and reviews the panel every year or two.

The point, for the employer, is control: fewer agencies calling hiring managers, consistent fees, no duplicate submissions from agencies who never agreed terms, and data to compare suppliers.

How do permanent and contract PSLs differ?

What are PSL tiers?

• Tier 1: a few agencies that see roles first, sometimes with an exclusive window.
• Tier 2: agencies that receive roles after the window closes, or overflow volume.
• Specialist suppliers: called only for certain role types, such as executive or niche technical roles.
• Master vendor: in some contract programs, one agency receives every order first and passes what it cannot fill to secondary suppliers; see the master vendor section of MSP vs. VMS.

An example with invented timings: a role goes to two Tier 1 agencies on Monday with five working days' exclusivity; if neither has submitted a candidate the manager wants to interview by the following Monday, it is released to four Tier 2 agencies. Tiers are earned: quarterly results move agencies up or down.

What terms does a PSL agreement cover?

• Fees: percentages by salary band, fixed fees, or bill-rate cards for contract roles, plus any volume discounts.
• Guarantee or rebate: what happens if a hire leaves within an agreed period.
• Payment terms: when invoices are due, and what triggers them, such as the start date.
• Candidate ownership: how long a submittal "belongs" to the agency and how duplicates are settled; see how to avoid double submissions.
• Exclusivity and release rules: who sees roles when.
• Service levels: such as time to first submittal and minimum interview rates.
• Compliance: licenses where required (see employment agency license requirements), insurance (see staffing agency insurance requirements), background and right-to-work checks, and a data protection agreement.
• Non-solicitation: limits on the agency recruiting the client's staff, and on the client hiring the agency's contractors directly; see non-solicitation clauses for recruiters.
• Review and termination: how often performance is reviewed and how either side can leave.

These are commercial terms, not legal advice; have the agreement reviewed before signing.

How does an employer build and review a PSL?

1. Map current spend. Which agencies placed whom last year, in which role families, at what fees, and how those hires performed.
2. Decide the shape. How many agencies per role family, whether to tier, and which roles stay with the internal team.
3. Run a selection. Ask for evidence: placements in similar roles, time to submittal, interview and offer ratios, references from comparable clients. The scorecard in how to choose a recruiting agency works for panels too.
4. Agree terms once, then publish the list and the rules to hiring managers, including how to request an exception.
5. Track results by agency: submittals, submittal-to-interview ratio, offers, acceptances, fill rate and early leavers.
6. Review quarterly and refresh periodically. A quarterly business review with each agency keeps the panel honest in both directions.

Most panels also need an exception route for a role nobody on the list can fill. A clear route keeps hiring managers from quietly going around the list.

How does a recruitment agency get onto a PSL?

• Ask the right question early. When a prospect says "we have a preferred supplier list", ask when it next opens and who owns it, as suggested in the business development email templates.
• Be tender-ready. Keep references, case studies, a fee proposal, insurance certificates, licenses and data protection documents current, so a two-week tender deadline is not a scramble.
• Win the role the panel cannot fill. Specialist agencies often enter through the exception route, then earn a permanent place.
• Bring market knowledge. A short, anonymized view of where the relevant people sit, built with a talent map, is a stronger pitch than a capabilities deck.
• Watch public tenders. UK public bodies advertise contracts and frameworks on Find a Tender.
• Do not go around procurement. Sending CVs to hiring managers at a company with a PSL tends to get an agency excluded from the next review.

Getting on is half of it. Panels usually ask for lower fees than open-market work, so check the margin before you bid; how to negotiate recruitment fees covers the trade-offs.

What does a public-sector panel look like?

In the UK, central buying bodies run recruitment frameworks that public organizations call off. Crown Commercial Service became the Government Commercial Agency (GCA) on April 1, 2026, according to the GCA site. Its RM6394 Executive & Non-Executive Search 3 framework, as of October 2026:

• is a closed framework let under the Procurement Act 2023, replacing RM6290;
• runs from August 3, 2026 to August 2, 2029;
• gives public sector organizations access to executive and non-executive recruitment services, covering permanent, fixed-term and inward secondment roles;
• lists 102 suppliers in Lot 1 (Grade 6 to SCS2 and equivalents) and 59 in Lot 2 (SCS3 and SCS4 and equivalents);
• allows buyers to award with or without a further competition.

Under the Procurement Act 2023, section 47, a framework's term generally may not exceed four years (eight for defence, security and utilities frameworks), unless the authority gives reasons for a longer one, with some exemptions. That is why public-sector panels reopen on a predictable cycle, and why agencies that miss one may wait years for the next.

How is a PSL different from an MSP, a VMS or RPO?

What are the pros and cons of a PSL?

Related terms

• Agency panel, approved supplier list, preferred vendor list: other names for a PSL.
• Framework: the UK public-sector form of a supplier panel.
• Master vendor: one agency that receives all orders first and subcontracts the rest.
• Off-PSL or exception request: using an agency outside the list for a specific role, with approval.
• Fill rate: the share of released roles an agency fills; see fill rate for staffing agencies.