Procurement teams are under pressure to cut costs without slowing down business. To hit their goals, many turn to group purchasing organizations (GPOs) to access pre-negotiated pricing and eliminate the administrative burden of vendor negotiations.

Those benefits are appealing, but they're not the whole story. While GPOs work well in some situations, they create new problems in others. Whether they're right for you depends on spend volume, industry, and the amount of control you're willing to trade for convenience.

Evaluating how the GPO model aligns with a mid-market or enterprise purchasing strategy makes it easier to uncover hidden operational limitations, forecast potential cost savings, and determine whether collective buying solves your sourcing challenges. 

Quick answer: 

• A group purchasing organization (GPO) pools the buying power of multiple businesses to negotiate better pricing and improved contract terms.
• GPOs aren't just for small businesses. Vertical GPOs are common in mid-market and enterprise organizations, especially in healthcare, where specialized versions are the norm rather than the exception.
• GPO savings and value depend heavily on participation fee structure, contract relevance, and on-contract spend.
• As your company grows, GPO contracts often become less flexible and harder to enforce, which is why many mid-market and enterprise teams pair a GPO with a platform that gives them more visibility and control.
• Order.co gives procurement and finance teams the pricing benefits of a GPO without vendor lock-in, minimums, or blind spots by combining its 40,000+ vendor network, sourcing algorithm that finds better prices and backorder alternatives, and full spend visibility.

Download the free ebook: The Modern Guide to GPOs–What They Are & Why They're Not Enough

What is a group purchasing organization?

A group purchasing organization (GPO) is a buying group that combines the purchasing power of many businesses, often within the same industry, to secure better pricing and contract terms than any single member could access on its own.

A GPO isn't a vendor itself. It's an intermediary that negotiates on behalf of its members, before giving those members access to the resulting contracts. In exchange, participants typically pay a membership fee, agree to route a share of their spend through the GPO's approved supplier network, or both.

GPOs differ from other collective buying models in a few ways. Unlike a purchasing cooperative, where members have voting rights and a direct say in vendor selection, a GPO is usually run by a centralized team that negotiates contracts with limited member input. And unlike simply asking your own vendors for a volume discount, a GPO's leverage comes from combining demand across dozens or hundreds of organizations.

Membership tends to attract businesses that want predictable, pre-negotiated pricing without building out a full internal procurement or sourcing function. That includes mid-market companies and, in some industries, large enterprises. Healthcare procurement is a good example, as many health systems, including large ones, rely on specialized, vertical GPOs to manage supply costs across hospitals and facilities.

What a GPO is not: 4 common myths

Despite their appeal, misconceptions about GPOs can result in missed savings or operational inefficiencies. Clearing up the following myths helps clarify a GPO's value:

Myth: GPOs make your procurement department unnecessary.

Reality: GPOs support your procurement process by providing access to pre-negotiated prices and suppliers. Since they aren't involved in your day-to-day purchasing decisions, they don't replace your team. You still need to evaluate contract terms and nurture vendor relationships.

Myth: GPOs are only for small businesses or large enterprises.

Reality: Neither is accurate. GPOs serve organizations of all sizes, and in industries like healthcare, verticalized GPOs are especially common among mid-market and enterprise organizations. What varies is how much control you keep over strategic sourcing decisions and how well the GPO's contracts match what your business buys.

Myth: Once you commit to a GPO, you can only buy through them.

Reality: Joining a GPO doesn't automatically limit you to their contracts, unless the terms specify otherwise. Read all agreements closely to ensure they fit your standards, budget, and needs.

Myth: GPOs are expensive and slow to show ROI.

Reality: Some GPOs charge low membership fees and can deliver savings quickly if managed well. However, long-term value depends heavily on supplier performance and market shifts, both of which are largely outside your control.

Ebook

The Modern Guide to GPOs: What They Are & Why They're Not Enough

Traditionally, GPOs have been a valuable tool for saving costs. But in the modern era of procurement automation, are GPOs still the best option? Read the ebook to find out.

Download the ebook

Types of group purchasing organizations

GPOs typically fall into three categories: vertical, horizontal, and master.

• Vertical GPOs are industry-specific groups formed by organizations that purchase similar products or services within a defined sector. They're common in healthcare, hospitality, and public institutions like school districts or municipal governments, with mid-market and enterprise organizations in these industries joining them to increase purchasing volume and gain access to more favorable contracts.
• Horizontal GPOs operate across multiple industries at the regional or national level, serving businesses of varying sizes. While these arrangements can meet the needs of companies looking for volume discounts, vendor selection is often less targeted than what you'd get with a vertical GPO.
• Master purchasing organizations (MPOs) are formed by large corporations to aggregate purchasing across subsidiaries, divisions, or related entities. This internal consolidation helps enterprise-level businesses standardize procurement and maximize their corporate purchasing power.

Examples of group purchasing organizations

Some of the largest and most established GPOs operate within specific industries:

• Vizient ranks among the largest healthcare GPOs in the US, serving thousands of hospitals and health systems.
• Premier Inc. is another major player in the healthcare sector, representing health systems and alliance members nationwide.
• HealthTrust Purchasing Group serves hospitals and healthcare facilities, largely within the HCA Healthcare network.
• E&I Cooperative Services focuses on higher education and nonprofit research institutions.
• OMNIA Partners operates as a horizontal GPO, serving public sector, education, and private-sector organizations across a wide range of categories.

How a GPO works

A group purchasing organization handles the heavy lifting of sourcing by managing the entire vendor lifecycle on behalf of its members:

1. GPOs negotiate contracts with suppliers on behalf of their members to secure favorable pricing, terms, and service levels.
2. GPOs simplify ordering by providing access to these pre-negotiated contracts for goods and services through the GPO's centralized platform. This eliminates redundant tasks, which reduces administrative work and improves sourcing efficiency.
3. Many GPOs also offer value-added services, such as electronic invoicing, cost-savings reports, trend analysis, and budgeting features to help members make more strategic purchasing decisions.

How do GPOs make money?

Most GPOs generate revenue by charging a membership fee, taking a percentage of member spend, or collecting contract fees from suppliers based on sales volume. Because GPOs may use one or a combination of these methods, it's essential to evaluate a GPO's total cost structure before selecting one as a partner.

Advantages of a group purchasing organization

A reputable GPO can offer real benefits, including better pricing, reduced purchasing barriers, and faster access to essential supplies:

• Access to volume discounts. GPOs pool demand across many organizations, which gives members access to better pricing than they'd likely negotiate on their own. This is often the primary reason companies join.
• Group buying power. Some vendors set order minimums that a single company can't easily meet, and GPOs pool member purchases to clear those thresholds. However, some contracts also require members to buy a minimum quantity during the contract term, so buying outside the GPO can affect compliance or savings.
• Curated selection. GPOs offer access to pre-vetted vendors with negotiated contracts. Buying from a curated catalog reduces time spent comparing pricing or vetting vendors manually, simplifying sourcing while supporting cost savings.

Average cost savings of GPOs

Although you should always weigh potential savings against opportunity costs, a GPO's financial impact can be significant. For example, a 2025 study published in the Journal of Public Economics found that when hospitals moved from a smaller-scale GPO to a much larger one, their supply expenses per discharge dropped by 4.8%. For the average hospital, that amounted to about $85 per discharge and over $1.2 million annually. 

However, your actual ROI depends heavily on spend volume, fee structure, and contract relevance. Horizontal GPO members, in particular, may see different returns based on the range and availability of goods within their contract.

Ask these questions to assess whether a GPO fits your procurement strategy:

• What are the ongoing membership fees?
• Are there any order minimums?
• Does the GPO generate revenue through administrative fees or other sources?
• How much of our total spend will be on contract?
• How will we source items that aren't covered by the GPO?
• How will we prevent off-contract and rogue spend?

Disadvantages of a group purchasing organization

The GPO model has real limitations worth considering before you commit:

• Unavailable on-contract goods. GPOs serve the collective needs of the group, which can limit flexibility for individual members. If a specific item isn't covered under the GPO's contracts, you may have to settle for an alternative or buy off-contract and lose your negotiated pricing.
• Loss of free market opportunities. Review how a GPO contract affects outside purchases before you sign. If the GPO under-negotiates an item's pricing or doesn't offer what you need, staying compliant with the contract could limit your ability to seek better deals elsewhere.
• Lack of transparency. Not all GPOs are upfront about how they make money or structure vendor relationships. Ask detailed questions about fees, revenue sources, and supplier terms. Due diligence here is essential to avoid a partnership that doesn't align with your procurement goals.

What others don't tell you about GPOs

Many GPOs operate as for-profit organizations that generate revenue from both members and suppliers. There's nothing inherently wrong with that model, but it's worth approaching the relationship with a clear understanding of how it affects your bottom line.

Here are a few realities you likely won't find in a GPO's promotional materials:

GPOs may encourage unnecessary spending

Volume is a key part of the GPO model, so representatives conducting procurement audits may recommend buying more than you actually need. Review GPO suggestions carefully to check whether they align with your current requirements.

GPO value can shrink as you grow

GPOs serve organizations of all sizes, but the math changes as your company scales. As your volume needs and negotiation power increase, the pricing advantage a GPO provides often narrows. For growing mid-market and enterprise organizations, that means a GPO that made sense a few years ago may offer diminishing returns today. 

GPOs can't help you control shadow spend

Partnering with a GPO can save money — if you can get your team to stay on contract. But without a centralized purchasing platform to track spending, it's hard to identify off-contract purchases. Employees accustomed to buying exactly what they want may bypass GPO agreements, reducing the financial benefit and creating hidden costs.

Alternatives to GPOs and when to use them

GPOs can be helpful in some cases, but you'll want to weigh your company's size, resources, and needs before deciding. In many situations, alternative approaches address specific challenges more effectively.

Strategic sourcing

Building an internal procurement strategy lets you negotiate customized deals and competitive pricing by selecting and leveraging beneficial partnerships. However, strategic sourcing takes time and expertise, and you'll need sufficient purchase volume to have real negotiating power.

Procurement software can close that gap, and platforms like Order.co go a step further. Its sourcing algorithm helps you find the best price or identify alternatives when goods are backordered, and its customized workflows and catalogs simplify the entire process.

Purchasing cooperatives

A purchasing cooperative is a member-owned organization where similar businesses work together to negotiate better deals. Members typically pay a fee to join and share in the cost savings. This can be a practical choice if you need industry-specific contracts and more influence over procurement decisions than a GPO typically allows.

While co-ops may sound similar to GPOs, the two have key distinctions:

Aspect	GPO	Co-op
Governance	Managed by a legal entity (nonprofit or for-profit) that negotiates on behalf of its members	Members have voting rights and a say in operations
Goal	The entity negotiates discounts and services, with profits flowing back to the GPO	Members leverage maximum collective buying power, with profits going back to the people
Leadership model	A centralized team determines strategy and negotiates contracts with limited member input	Members democratically shape contract terms, vendor choices, and policies through committees

Centralized procurement by a parent organization

Another alternative to a GPO is centralizing procurement under a parent company or umbrella organization. This model organizes purchasing decisions under one coordinated function that supports all departments, teams, or business entities.

If you run an enterprise organization with multiple branches or subsidiaries, this approach can work well. Consolidating purchasing lets you leverage company-wide volume to negotiate more favorable contracts, improve vendor relationships, and increase procurement efficiency.

Ebook

The Modern Guide to GPOs: What They Are & Why They're Not Enough

Traditionally, GPOs have been a valuable tool for saving costs. But in the modern era of procurement automation, are GPOs still the best option? Read the ebook to find out.

Download

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Order.co as a GPO alternative or complement

While GPOs sometimes offer real advantages, they don't replace your procurement process. GPOs typically lack automated spend controls, multi-vendor intelligence, and integrated payment and invoicing workflows, all of which matter for modern, cost-effective purchasing.

Order.co gives you many of the benefits of a GPO while adding visibility and control that most GPOs don't offer:

• A 40,000+ vendor network for access to competitive pricing and automatic substitutions when goods are backordered or unavailable. You're also free to bring your own vendors into the platform.
• Centralized procurement software with curated item catalogs and role-based spending guardrails, so purchasing stays within budget and aligned with company goals. Control starts at the catalog level: Only pre-approved products and vendors are visible to buyers, so the compliant choice is also the easy one.
• Spend management and reporting features that help you track spend, spot rogue purchasing, and make faster decisions.
• A sourcing algorithm that finds better prices and backorder alternatives across the vendor network, helping businesses realize hard-dollar savings of 5-8% on average, without being locked into a single set of contracts.
• Automated ordering and fulfillment. Order.co generates purchase orders, sends approved purchases to vendors, and places the order, so requests move straight from approval to fulfillment instead of stalling in a queue.

If you're already in a GPO, Order.co can complement that relationship by filling gaps in automation, oversight, and supplier access. If you aren't using one, Order.co can help you unlock measurable cost savings without order minimums or contract restrictions.

Curious what you'd save by pairing or replacing your GPO with a platform that isn't locked to one vendor list? Schedule a demo of Order.co to find out.

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