Electrical Buying Groups: IMARK, Affiliated Distributors

An electrical buying group is a member organization of independent distributors that negotiates rebate programs with manufacturers on behalf of all of them at once. IMARK and Affiliated Distributors (AD) are the two names you will hear most. If your supply house is independent rather than a branch of a national chain, it almost certainly belongs to one of them, and that membership shapes what it pays for the material it sells you.

NAED belongs in the same conversation for a different reason. It is the National Association of Electrical Distributors, a trade association, not a buying group. It does not negotiate anything on your distributor’s behalf. Getting that distinction right saves you from asking your rep a question that has no answer.

This post names the organizations, explains what each one actually does, and is honest about how far down the chain their work reaches before it hits your invoice. The short answer on that last point: further than most contractors realize, but less directly than the phrase “buying group” suggests.

Why independents join a group at all

A single independent distributor buying from a national manufacturer has no leverage. Six hundred of them, buying against one negotiated program, do. That is the whole idea, and it is a large share of the channel: Electrical Wholesaling reports 32.2 percent of total electrical distribution sales flowing through members of buying and marketing groups, and notes that rebates from pooled group purchases are the only profit some distributors see in a downturn.

There is a real distinction between two kinds of group, and the trade defends it. Contracting Business describes buying groups as requiring vendors to meet predetermined discount levels and members to commit purchase volumes, while marketing groups run co-op and promotional programs instead. The same article carries the line that should govern your expectations: “we negotiate rebates, not prices.”

Hold onto that. It is the reason a distributor can belong to a very large group and still quote you an ordinary number.

Affiliated Distributors (AD)

AD is a member-owned group spanning several trades, not just electrical. It reports over 1,000 independent distributor members, more than 9,000 locations and over $100 billion in annual sales across its Electrical, HVAC, Plumbing, PVF and Waterworks divisions, and says it has averaged 100 percent supplier rebate distributions over the last ten years.

That last figure is the one worth understanding, because it is easy to misread. It describes rebate dollars flowing back to member distributors, not a discount flowing to you. It is a statement about how completely the group returns what it collects, which matters to your supplier’s economics and reaches you only through what your supplier chooses to do with better economics.

AD also runs member-facing programs aimed at moving purchases onto contracted suppliers. On the plumbing and HVAC side, PHCP Pros describes AD’s Conversion Campaign alongside other group rebate mechanics. Those campaigns are why your supply house sometimes pushes a particular manufacturer’s line hard for a quarter. It is not arbitrary, and it is not a trick. There is a program behind it.

IMARK

IMARK is the other name on the electrical side, and it is large. Modern Distribution Management reported IMARK Group overall at roughly 2,300 distributors and $28 billion in revenue at the time of its merger coverage.

IMARK is not electrical only. It runs a plumbing division whose rebate mechanics are documented publicly: PHCP Pros describes IMARK Plumbing’s GainShare joint planning program, which sets purchase objectives with suppliers. That structure, objectives agreed up front and rebate earned against them, is a fair mental model for how these programs generally work in any trade.

One practical note for research. IMARK’s own website has been unreliable to reach, so the figures above are cited to trade press coverage rather than to the group directly. If you want current numbers, the trade publications are the better source.

The AD and IMARK Electrical merger

The two largest names in electrical distribution buying groups moved together. MDM reported the AD and IMARK Electrical merger creating the Independent Electrical Supply Division, U.S. (IESD), representing 725 independently owned electrical distributors in the United States.

Consolidation on the group side changes the negotiating math with manufacturers, and the trade discussed it openly at the time. Electrical Trends noted that manufacturers holding a different deal per group face a “highest rebate percentage wins” dynamic, which is exactly the arbitrage that fewer, larger groups remove.

What that means for you is genuinely uncertain, and anyone who tells you otherwise is guessing. A stronger group can win better programs for independents, which helps them compete with national chains on price. A less fragmented group landscape also removes a source of variation that some distributors were quietly exploiting. Both effects are real. Neither shows up labeled on your invoice.

NAED is an association, not a buying group

This is the correction that makes the rest of the picture legible.

NAED is the National Association of Electrical Distributors, providing classes, research, benchmarking and data analytics plus the EPEC and CEP credentials for distributor personnel. It trains and measures the industry. It does not pool purchases and it does not negotiate rebates.

Its publishing arm is visible to contractors even if the association is not. tED, The Electrical Distributor magazine, is associated with NAED and runs the DistributED podcast covering the electrical supply chain. If you have ever wanted to know what your distributor is being told about margin, that publication is where to look. One tED article on distributor profitability discusses missed rebate and co-op opportunities and the habit of marking up “on the 5’s”, and notes that small accounts are often a thousand basis points more profitable than large ones.

So NAED does affect your price, just indirectly and over a longer horizon: through how well the person quoting you was trained, and through the benchmarks their management is measured against. That is a real influence. It is not a lever you can pull.

Who does what

Organization	What it is	What it negotiates	How it reaches your price
Affiliated Distributors (AD)	Member-owned group across electrical, HVAC, plumbing, PVF, waterworks	Supplier programs and rebates for member distributors	Improves member cost, plus conversion campaigns that steer which brands get pushed
IMARK	Large member group with electrical and plumbing divisions	Supplier programs, joint planning with purchase objectives	Same mechanism, through the member distributor’s economics
IESD	Division formed by the AD and IMARK Electrical merger	Consolidated electrical programs for independents	Fewer, larger programs behind independent distributors
NAED	Trade association	Nothing on your behalf	Training, benchmarking and research that shape distributor practice
tED magazine	NAED-associated publication	Nothing	Visibility into what your distributor reads about margin

How group membership actually reaches your invoice

Trace the path and the limits become obvious.

Step one, the group negotiates a program with a manufacturer. Rebate levels tied to volume commitments across the membership.

Step two, your distributor buys against that program. Its into-stock cost on covered lines improves, some of it immediately and some as a rebate settled later. SPARXiQ estimates that 25 to 50 percent or more of a distributor’s revenue carries vendor cost supports worth roughly 10 to 20 percent against standard into-stock pricing, with variation of 25 percent or more between similar deals.

Step three, the rebate settles after the sale. Which means your distributor sold you the material before it collected. Electrical Trends describes the working capital strain this creates in ship-and-debit programs.

Step four, your price is set locally. By your negotiated multiplier, your account classification, and whatever special pricing agreement is attached to that specific part number. None of that updates automatically because a group won a better program.

Step four is where your leverage lives. The group work happens above your distributor. Your agreement happens with your distributor. Improving your number means working on the second one, which is the subject of negotiating with your supply house and, underneath it, of understanding column pricing at an electrical distributor well enough to know what you are asking for.

What to do with this

Four things are worth doing, and one is not.

Worth doing: find out whether your distributor is independent. If it is, it is likely a group member, and group programs are concentrated on particular manufacturer lines. Asking which lines your distributor is strongest on is a normal question and usually gets a straight answer.

Worth doing: ask which of your regular part numbers sit on a program. Programs lapse, and when they do your price moves without a decision being made. That is the same mechanism as ordinary price creep, just with a specific cause.

Worth doing: notice when a brand gets pushed. A conversion campaign is a legitimate reason your rep suddenly favors a manufacturer. If the substitute genuinely meets spec, there may be room in that price.

Worth doing: keep your own unit price history. Group structures change every few years. Your invoice history is the only record that is continuously yours, and it is what lets you notice that a part you buy monthly quietly repriced. The gap between what you were quoted and what you were billed has its own mechanics in contract price versus counter price.

Not worth doing: asking to see group rebate terms. Those are confidential between the group, the manufacturer and the member. Asking makes the conversation adversarial and gets you nothing. Ask about your own agreement instead, where every question is legitimate.

For the plumbing and HVAC equivalents of these organizations, which are structured differently, see HARDI, ASA and BLUE HAWK. And for the full map of how rebate money moves before it becomes your price, start with where the rebate money goes.

The short version

IMARK and AD are buying groups: member organizations of independent distributors that negotiate manufacturer rebate programs collectively.
AD reports over 1,000 members, 9,000-plus locations and over $100 billion in annual sales across five trade divisions.
AD and IMARK Electrical merged into IESD, representing 725 independent U.S. electrical distributors.
NAED is a trade association, not a buying group. It trains and benchmarks the industry and negotiates nothing on your behalf.
Groups negotiate rebates, not your prices. Membership improves your distributor’s cost. Your price is still set locally.
Your leverage is your own agreement and your own price history, not the group’s programs.