Principal media practice 20 years inside agency commercial and principal media

Principal media,
built on the record.

Every major holding company now has a principal capability. Most independents want one and cannot build one — not because the commercial logic is hard, but because the entity only works if six things are true at once. Get five of six right and you have built a liability.

Rareview builds the entity, the controls, and the records that stand behind them — the consent, the baseline, the reconciliation. DJ Martin founded and scaled these businesses from the inside, rather than advising on them from across the table.

Book a readiness conversation → See the engagement

The launch gates Sequence

Blocker Revenue recognition · tax posture · media-owner master agreement

Before the first opt-in Credit policy · rebate treatment · client disclosure schedule

Before the first insertion order Payment terms · sequential liability · cancellation alignment

Before the first invoice Billing mechanism · benefit credit · exposure reporting

Before month-end close Cost burdening · transfer pricing

Nothing is coded to the entity until its gate is clear. Every open decision carries a named owner and a gate — which is what turns a policy document into a launch plan.

58%↑ 47 of marketers used principal media in the past year

90%↑ 79 say their top concern is whether the recommendation is in their interest

57% have any guidelines governing principal media — 43% have none

63% address it in their agency contracts — a third do not, or do not know

ANA principal media study, March 2026. 114 client-side marketers surveyed October 2025 – January 2026.

§ The window

Demand is growing. Governance is not. Scrutiny is sharpening.

That gap is where builds fail. Closing it is the work.

Adoption is climbing fastest in television and the digital open web, where aggregated buying makes resale work. Holding companies are competing hard for share. Public disclosure of the underlying economics remains limited across the category — on the ANA's own numbers, only 57% of marketers have any governing guidelines at all.

At the same time, advertisers have never looked harder. Nine in ten now name it as their leading concern — whether a principal recommendation is genuinely in their interest — and the ANA has told them to put approval and transparency requirements into contracts before transactions occur.

The agencies that win the next three years are not the ones that stand up an entity fastest. They are the ones whose entity still stands up when a client reviews it in year two — because the consent, the baseline and the reconciliations were built to be produced.

§ Why builds fail

Six things have to be true at once.

Each one is survivable on its own. Missing any one of them takes the others down with it.

Entity

Clean separation

Separate trial balance and general ledger, its own consolidation path, and a coding convention that makes it structurally impossible for agency and principal media to co-mingle on the same sheet.

Recognition

The gross position

Gross presentation follows the economics. It is available only where the entity genuinely bears inventory risk and controls the buy, and the buy-side terms have to be consistent with that. Where they are not, net is the right answer and the model has to work on that basis.

Cash

Working capital is a decision

Buy-side terms set against sell-side terms so the entity's funding requirement is known rather than discovered. Any deposit or prepay is priced, approved and carried deliberately — never absorbed by default.

Credit

Exposure is capped

A principal deal can leave you owing a media owner for media already delivered. That requires a credit policy, a security ladder, and rolling exposure monitoring the pass-through model never needed.

Disclosure

The client said yes — on the record

A signed opt-in that states the entity acts as principal, that it earns a margin, how rebates and added value are treated, and the baseline any benefit is measured against. That is the minimum record. Whether the client also sees the margin itself is a decision to put to them, not one to make for them.

Contract

Both sides mirror

Sequential liability, matched cancellation windows, make-good claim windows that do not expire before the client's. One-sided flexibility is how you end up paying for inventory you can no longer bill.

§ The engagement

Four phases to launch. Then governance.

Phase 0 answers whether you should do this at all. Phases 2 and 3 run in parallel with the design work. Most builds run four to six months end to end; a compressed path runs three.

03 weeks

Principal Readiness Assessment

Should we do this, what is it worth, and what would it take?

Fixed fee · credited against the build

Margin opportunity model — spend base, addressable channels, realistic penetration, contribution across years one to three
Capability and systems gap scan across deal capture, contract management, billing, ledger and planning
Client-agreement review — which agreements already permit principal transactions, which prohibit them, and which require consent before anything is offered
Go / no-go recommendation and a sequenced build roadmap

You receiveReadiness report · margin opportunity model · build roadmap · board-ready recommendation

16–8 weeks

Entity & Operating Model Design

How does a transaction actually flow, and where does finance touch it?

Legal entity, tax and payroll architecture — what sits in the new entity and what stays with the parent
Systems of record map and the integration specification, from deal capture through to planning
Separation architecture: coding and naming conventions, separate ledger, consolidation path
The end-to-end process narrative across all six stages, with both billing paths designed
The decision register — every unresolved treatment, with a named owner and a launch gate

You receiveProcess narrative · systems & integration map · process flow · decision register with recommended starting positions

24–6 weeks

Commercial & Contract Architecture

What do we sign, on both sides, so the margin is real and the risk is capped?

Parallel to Phase 1

Media-owner master term sheet — sequential liability, back-to-back terms, cancellation alignment, make-goods, rate holds, rebate and added-value ownership with the matching client disclosure, audit rights, set-off
Client disclosure and opt-in schedule, in plain language, written to be read and kept by the client
The benefit measurement standard — the baseline every savings figure is measured against, agreed with the client in advance so the figure can be independently verified
The margin waterfall, with every line classified for Finance
Delegation of authority and the exception matrix — named approver and proceed-or-hold rule for each
Media-owner communication standards — who is authorised to commit the entity, and what is confirmed in writing on every buy

You receiveBuy-side term sheet library · opt-in schedule · benefit measurement standard · waterfall model · authority & exception matrix

34 weeks

Financial Controls & Risk

Does this hold under close, under audit, and under a client that does not pay?

Parallel to Phase 2

Gross versus net position paper — whether the risk and control the entity actually retains support gross presentation, documented for the auditor, including how the sequential-liability and payment-release terms bear on that conclusion
Client credit policy — assessment, exposure caps, security ladder, rolling monitoring across concurrent flights
The weekly credit exposure report, built and handed over
Cost, deposit and prepaid treatment matched to actualisation rather than straight-lined
The control set: reconciliation integrity, the payment-release control, the consent gate, and the confidentiality and data-handling standard
Tax readiness brief covering resale taxability and intercompany transfer pricing

You receivePosition paper · credit policy · exposure report · controls framework · tax readiness brief · journal entry set

44–6 weeks

Launch & Enablement

Can the team run it without us?

A pilot deal run end to end, origination through reconciliation, with Rareview alongside
Commercial enablement — how Sales and Client Service present the model, the opt-in and the benefit election, using disclosure language written and approved by Finance and Legal, with Finance available to the client on request. Clear ownership is what stops the disclosure conversation being skipped or improvised.
Billing, RevOps and Accounting training on the codes, the gates and the mixed-estimate rule
Launch gate sign-off against the decision register, then a 90-day review

You receiveCompleted pilot deal · commercial playbook · operations & billing playbook · launch gate sign-off · 90-day review

Ongoing

Principal Governance Retainer

Does it still hold a year in?

Monthly · 12-month term

Quarterly control review and exception audit
Credit exposure and margin review
Buy-side term benchmarking as the entity scales into new channels and owners
Client audit and review readiness — confirming the consent records, baselines, reconciliations and benefit calculations are complete and retrievable before a client asks for them
Standing access for deal-level escalations

§ Operating model

Six stages. Every one has a finance consequence.

This is the spine of the build. The full process narrative documents each stage system by system, with the treatment, the control and the owner at every step.

The six stages of a principal media transaction and the finance treatment at each
Stage	What happens	Finance treatment
1Setup	Entity stood up, coding and naming conventions established, systems configured	New entity in consolidated reporting; separate trial balance and ledger
2Originate & contract	Deal captured and identified as principal; buy-side and client agreements executed	Routed to the entity; credit assessment and exposure limits applied, and client consent documented before the buy
3Procure inventory	The entity buys the media as principal; deposits where the owner requires them	Deposits carried as prepaid and drawn down against each buy as media actualises — not straight-lined
4Sell & bill	Sold to the agency for pass-through clients, or invoiced direct where the entity is the counterparty	Entity on the invoice face; vendor-level detail retained intact and produced under the audit rights on the scope the opt-in schedule sets out
5Recognise	Revenue and media cost recognised on the entity, coded to client and pod	Gross or net per the position paper; where gross, revenue with media cost of goods sold and net margin reporting; attributable in consolidation
6Reconcile & report	Vendor detail matched to the principal code; client benefit applied; results consolidated	Vendor payment released on the terms the buy-side agreement sets, once reconciliation ties out 100%; where those terms leave the entity funding the position, the exposure sits under the credit policy

§ Decision register

Thirty-one decisions stand between you and go-live.

Every one gets an owner, a launch gate and a recommended starting position — the default you run with unless Legal, Tax or Accounting says otherwise. Nothing sits unassigned. A sample:

Decision	Owner	Gate
Gross versus net recognition given media cost of goods sold	Technical Accounting	Blocker
Whether the risk and control retained under the sequential-liability terms support gross presentation	Legal + Technical Accounting	Blocker
Sales tax treatment under a principal resale model	Tax	Blocker
Media-owner master agreement template	Legal	Blocker
Client credit policy, exposure limits and security requirements	Finance / Credit	Before first opt-in
Rebate and added-value ownership, disclosure and client sharing	Finance + Legal	Before first opt-in
Back-to-back payment terms and float policy — where the entity funds the position, how it is priced and approved	Finance	Before first IO
Cancellation window alignment, buy side against sell side	Legal	Before first IO
How client benefit is captured, recognised and credited	Finance	Before first invoice
Transfer pricing between the entity and the parent	Tax	Before month-end close
Foreign exchange treatment for non-USD inventory	Accounting	Next phase

Eleven of thirty-one shown. The full register, the recommended positions and the reasoning behind each are part of the engagement.

§ Track record

Built from the inside.

DJ Martin has founded, run and scaled principal-based media businesses inside two of the largest holding companies in the industry. This is operator experience, not a practice area.

Agyle AdvantageDentsu International — Founder

Built a principal-based media investment business from nothing.

As Group Chief Commercial Officer, harmonised pricing and contracting across the group's agency brands — the commercial architecture a principal entity depends on.

Entity build
Pricing & contracting
Group commercial

OMnetOmnicom Media Group — Managing Director

Scaled a principal buying business through deal structure and supplier partnership.

Served simultaneously as Chief Procurement Officer, launching Omnicom's first Procurement Center of Excellence.

Principal deal structure
Supplier partnership
Procurement CoE

ICON InternationalOmnicom Group

Rebuilt a legacy sourcing division into a unified procurement platform.

Supplier and category transformation inside a business built on principal economics.

Turnaround
Category transformation

Extreme ReachGlobal Chief Commercial Officer

Recruited by private-equity ownership to strengthen commercial governance.

Pricing, contracting and profitability governance across a global software and payments platform.

PE value creation
Pricing & contracting
Working capital

Most recently, Rareview designed the end-to-end operating model, control framework and buy-side term architecture for an independent agency's new principal entity; reference available under NDA. Named as an “Agency Innovator” by The Internationalist for pioneering procurement-led investment models. MBA, Thunderbird School of Global Management. Fuller background →

§ Fit

Who this is built for.

→Independent and mid-market agencies with $75M or more in managed media and a finance function that can absorb a second entity
→Agency groups and roll-ups where a principal entity forms part of the value-creation plan
→Private-equity-backed agencies where a durable principal capability forms part of the long-term operating plan
→Media owners and platforms building a principal sell-side motion

×Below roughly $75M in managed media the entity overhead tends to exceed the margin. We will tell you that in Phase 0 rather than after.
×If your largest clients' agreements prohibit principal, the only route is a renegotiation those clients enter with full information. If you are not prepared to have that conversation openly, this is not the right time.

Also available

Principal Media Audit & Defense

For advertisers, CFOs and private-equity sponsors sitting on the other side of the table. Is the disclosure defensible? Are the contract provisions actually there? Is the benefit substantiated against a real baseline? Is the margin what you think it is?

Same discipline, opposite seat. We do not act on both sides of the same entity: where Rareview has advised on a build we decline audit or defence work against it, and any current or prior agency relationship is disclosed before an advertiser engagement is accepted.

Enquire →

§ Next step

Start with the readiness conversation.

Thirty minutes. We will tell you roughly what principal is worth against your spend base, what your current client agreements already allow, and whether a build is the right call this year. No deck required.

If it is not the right call, we will say so — that answer is worth more to you than a proposal.

Emaildj.martin@rareviewadvisorygroup.com Direct475 266 9708 LinkedInDJ Martin →

FounderDJ Martin

Principal media,built on the record.