Media buying agencies supplier comparison: a method

Use the directory's agency listings to form a shortlist. Record each shortlisted agency's directory listing name and proposed contracting entity so the comparison identifies both. A media buying agencies supplier comparison starts with one written commission, not agency websites. Fix the channels, markets, responsibilities and reporting outputs first. Then ask each bidder to show how its proposed team and commercial route would handle the same situations.

What to take away

Establish a common boundary

Issue a scope schedule with the brief. State whether the agency must provide strategy, planning, negotiation, platform operation, creative trafficking, verification, reporting and invoice reconciliation. Identify work retained by the advertiser or another partner. A lower fee means little if one bid excludes work that another includes.

For a UK contract reference point, ask whether the proposed terms use the IPA/ISBA Media Services Framework and record any departures for legal review. Check channel-specific rules, including the CAP Code for non-broadcast advertising, the BCAP Code for broadcast advertising and relevant Ofcom requirements; ask whether Clearcast (TV) or Radiocentre (radio) clearance applies. For audience or tag transfers, assess UK GDPR and, where cookies or similar technologies are involved, the Privacy and Electronic Communications Regulations (PECR). Applicability depends on the activity and channel, so have advisers confirm which requirements apply.

Compare the buying route

Ask bidders to draw the path from advertiser funds to media owner, including buying platforms, resellers, data suppliers and verification. As named reference points, ask whether buying uses DV360, The Trade Desk or Amazon DSP, and whether verification is through DoubleVerify or Integral Ad Science; these are examples, not default requirements. Require bidders to label principal and agent positions, proprietary products, rebates or benefits, and any party they may substitute. For proprietary products, record what is disclosed about transparency, governance and data.

Do not award a generic transparency score. Record precise answers: which costs are visible, which records the advertiser may inspect, and what approval is needed before the route changes.

Use demonstrations, not adjectives

Give every supplier the same three scenarios: a live campaign needs an urgent creative correction; a platform report does not reconcile with an invoice; and, at termination, live orders, audiences, tags and reporting access need to be transferred. Ask the proposed delivery team to work through each case, stating who acts, what approval is required and what record it would provide. Compare the responses side by side to test operational fit, not presentation style.

If a bidder names Google Ads conversion reporting, use Google's first-party tracking documentation to establish the available categories, then ask which configuration and advertiser data would be used. For relevant UK audiences, ask whether measurement relies on BARB, RAJAR, ABC, JICREG or UKOM, and specify the metric and reporting source in each bid. The page explains Google's product. It does not validate the agency's measurement judgement.

Match commercial units

Convert every bid into an agreed comparison period and scope. For each cost line, request the bidder's actual quoted amount, unit, billing basis and assumptions; separate agency remuneration, media, technology, research, data, verification, production and taxes. Show whether percentage charges use gross media, net media or another base, and list minimum commitments and change charges beside the relevant service.

Include remuneration and record access in the commercial review. Legal advisers should review the final terms.

Compare control and exit

For each important account, note the legal owner, administrator, recovery contact, historical export and transfer process. Ask what happens to live orders, audiences, tags and reporting access on termination. Check authentication, logging and integrations as part of the security review.

Research limit and decision rule

No agency bid, demonstration, contract or campaign was assessed, and there is no commercial relationship with a supplier. This is a buying template, not a provider verdict; use it to compare evidence against your requirements rather than to infer an agency ranking.

Eliminate bids that fail a mandatory condition. For those remaining, write a short reasoned choice tied to evidence and unresolved risk. Preserve bidder clarifications and assumptions. A procurement decision should be explainable without turning subjective presentation quality into a proxy for operational fit.

Before approval, let finance inspect a sample cost schedule and let the intended account users examine the proposed access. Their findings answer different questions. Record each concern against the relevant supplier response, then ask for clarification on equal terms. This avoids allowing the most polished pitch team to conceal a weak handover or reporting process.

Before you act

Common questions

What should be fixed before asking agencies to bid?

Set the channels, markets, responsibilities, reporting outputs and comparison period in a written scope schedule. Ask each bidder to mark included work, exclusions and assumptions against that same schedule before comparing bids.

How should transparency be assessed in bids?

Ask for a route map that identifies intermediaries, principal or agent positions, visible costs, rebates or benefits and any proposed substitutions. Record which supporting records the advertiser can inspect and what approval is needed before the route changes.

What should be done before approving a procurement decision?

Have finance check a sample cost schedule against the bidder's quoted units and assumptions. Ask the intended account users to verify proposed access, ownership and transfer arrangements, then record unresolved issues alongside the supplier's response.