If you've spent any time around a corporate supplier diversity program, you've heard the terms Tier 1 and Tier 2. They get thrown around in RFPs, scorecards, and annual reports as if everyone already knows the difference. Plenty of people don't, including diverse suppliers who are leaving money on the table because they only chase one of the two.
Here's the short version. Tier 1 is what a corporation buys directly from you. Tier 2 is what that corporation's suppliers buy from you on their behalf. Both count toward a company's diversity spend numbers. They count in very different ways, and they open very different doors.
This matters for two audiences. If you run a diverse business, Tier 2 is a second front door into companies whose Tier 1 contracts are already locked up by incumbents. If you manage a supplier diversity program, Tier 2 is how your reported impact stretches past the vendors you pay directly. Let's break down both.
Tier 1: the spend you can see on an invoiceTier 1 diverse spend is the value of goods and services a corporation buys directly from certified diverse suppliers: minority-owned, women-owned, veteran-owned, LGBTQ-owned, and disability-owned businesses. The corporation signs the contract, the corporation cuts the check, and the dollars show up in its own accounts payable and ERP systems.
That last part is why Tier 1 is the cleaner, more trusted number. It's auditable. A supplier diversity team can pull a report from the AP system, filter for vendors flagged as diverse, and produce a defensible total. When you read that a company spent "$2.3 billion with diverse suppliers last year," that headline figure is almost always Tier 1.
It's also the number that carries the most weight in industry recognition. The Billion Dollar Roundtable, the group of corporations that spend at least $1 billion annually with diverse suppliers, sets its membership threshold on certified Tier 1 spend. Tier 2 doesn't currently count toward the billion-dollar bar, though the organization has said it's exploring how to include it in future criteria. For now, when a company wants the prestige, Tier 1 is what gets it there.
Tier 2: your suppliers' suppliersTier 2 diverse spend is indirect. It's the money a corporation's Tier 1 suppliers, its prime vendors, spend with diverse businesses while delivering goods and services to that corporation.
Walk it through. A bank hires a large facilities-management firm to run its buildings. That firm isn't minority-owned, so it doesn't count as Tier 1 diverse spend. But the firm subcontracts janitorial work to a Latina-owned cleaning company, buys supplies from a Black-owned distributor, and uses a woman-owned staffing agency. Those subcontracts are Tier 2 diverse spend for the bank. The bank never pays those three businesses directly. It still gets to claim a share of that spend as part of its diversity impact, because its procurement decisions made it possible.
This is why large programs lean on Tier 2. A Fortune 500 company can only place so many contracts directly with diverse firms before it runs into category limits, incumbent relationships, and scale problems. Tier 2 lets the company push diversity goals down through its primes and count the result.
How Tier 2 actually gets countedThere are two methods, and the difference is worth understanding because it changes how much credit you generate as a sub.
Direct Tier 2 ties a specific dollar to a specific project. A prime working on the bank's contract buys from a certified diverse sub specifically to deliver that contract, and reports that exact amount. It's traceable back to a project and a supplier. It's the more precise and more credible of the two.
Indirect Tier 2, the more common method, uses allocation. The prime reports its total spend with diverse businesses across its whole company, then attributes a portion to the corporation based on that corporation's share of the prime's overall revenue. If the bank represents 8% of the facilities firm's annual sales, the bank gets credited with roughly 8% of that firm's total diverse spend. Indirect Tier 2 distributes existing diverse spend rather than driving new dollars to diverse suppliers, which is why some programs treat it as the softer number.
Both show up in supplier diversity reports. Sophisticated buyers track them separately and weight direct Tier 2 more heavily, because it reflects real demand created by their business rather than a statistical allocation.
Why a diverse supplier should care about Tier 2If you only pursue Tier 1, you're competing for the contracts a corporation awards directly, and those are often held by entrenched incumbents on multi-year terms. Tier 2 gives you a second route in.
Many large companies put Tier 2 requirements into their prime contracts. A prime bidding on a major corporate account may be expected to report Tier 2 diverse spend, or to hit a target for it. That creates active demand: the prime needs certified diverse subs to satisfy its customer's program. You become useful not just for what you sell, but for the diversity credit you let the prime report upstream.
The practical move is to stop thinking of the corporation as your only customer. Find out who its primes are: the big facilities firms, IT integrators, staffing agencies, logistics providers, and marketing shops that hold its direct contracts. Those primes are your Tier 2 buyers. Many run their own supplier diversity outreach precisely because their corporate customers require it. Our corporate program directory is a starting point for mapping which companies run formal programs and who sits in their supply chains.
Certification is the gate for both tiersNone of this counts unless you're certified. Tier 1 and Tier 2 both depend on a third-party certification verifying that your business is at least 51% owned, operated, and controlled by individuals in a recognized diverse category. The relevant ones are NMSDC for minority-owned, WBENC for women-owned, NaVOBA for veteran-owned, NGLCC for LGBTQ-owned, and Disability:IN for disability-owned businesses.
For Tier 2 specifically, certification does extra work. When a prime allocates or reports Tier 2 spend, it has to back up every dollar with proof the sub is genuinely diverse. Self-identification rarely survives an audit. A current certification with one of those bodies is what lets a prime credit your spend with confidence, and many primes won't count uncertified subs at all. If you're weighing which certifications to pursue, CertifyAll handles the filing across the bodies that matter so you're eligible across more programs at once.
A worked exampleSay you run a certified woman-owned printing company. You bid directly to a national insurer's marketing department and lose; their print contract has been with the same vendor for six years. That's a closed Tier 1 door.
So you go to the insurer's primary marketing agency, the one holding the direct contract. That agency has a Tier 2 reporting obligation to the insurer and is short on certified diverse subs. You become their print supplier for the insurer's campaigns. The agency reports your invoices as direct Tier 2 spend, tied to the insurer's account. You got the revenue, the agency hit its target, and the insurer counts the spend. Three parties, one certification, and a contract you'd never have reached through the front door.
What to do with thisIf you're a supplier: get and keep your certification current, then map the primes sitting between you and the corporations you want to reach. Pursue Tier 2 with the same seriousness as Tier 1. To be discoverable by both corporate buyers and their primes, list your business in our supplier directory so the people allocating spend can find you.
If you manage a program: be honest about your direct versus indirect Tier 2 split, and weight them accordingly. Allocation math inflates a number without moving a dollar to a new diverse supplier. The companies building real influence are the ones writing Tier 2 expectations into prime contracts and tracking direct, project-tied spend. For where corporate programs are heading on this, see our take on corporate supplier diversity in 2026.
