IIDigital MarketingGuide
Co-Marketing With Partners: Webinars, Articles, Referrals
Two businesses with the same customers and different services reach more people together than each does alone. But each also takes on a piece of the other's reputation.
Key takeaways
- Partner marketing means two independent businesses promote together, for example with a webinar, a specialist article or mutual referrals. Each contributes its contacts and its knowledge.
- Joint appearances rub off. Simonin and Ruth (1998) showed that attitudes toward a brand alliance shape the later image of both partners, more strongly for the less familiar partner.
- Whether it works depends on fit: do the services complement each other, and do the businesses match in reputation and attitude? Poor fit can harm both.
- The fit test checks three questions before the start: same customers without competition, complementary services, similar attitude. Then tasks, data and evaluation are agreed in writing.
Why joint marketing makes sense for small businesses
A small business has a limited number of contacts: its customers, its newsletter, its network. A partner who serves the same customers with a different service has a similar number, but different names. A tax office and a software provider for trade businesses, an architecture firm and a building services engineer, a machine builder and a provider of maintenance contracts: they all address the same people without competing with each other. Joint marketing makes sense and is nevertheless rarely pursued systematically.
Put simply, the question is: When is joint marketing with partners worthwhile, which formats suit small businesses, and what needs to be agreed beforehand? To answer it, we first clarify the terms and a model from brand research that explains why joint appearances rub off. Then we weigh up opportunities and risks and go through the three most common formats.
The article setting up sales partnerships describes partnerships in which businesses sell together or pass orders to each other. This article covers a lighter form: becoming visible together without selling together.
Whoever appears together borrows the other's reputation. That is the gain, and it is the risk.
What is partner marketing?
By partner marketing, also called co-marketing, I mean joint marketing activities of two independent businesses that have the same target customers but offer different services. Each partner contributes its contacts, expertise and name, and both benefit from the greater reach. Unlike in a sales partnership, there are usually no commissions, and each partner remains responsible for its own customers.
| Form | How it works | Effort | Commitment |
|---|---|---|---|
| Joint webinar or talk | Both partners speak on a topic, each invites its contacts | medium | medium |
| Joint specialist article or guide | Both write one part, both publish and distribute | medium | medium |
| Article swap | Each writes a guest article for the other's website or newsletter | low | low |
| Mutual referral | Partners name each other on the website, in proposals or in conversation | low | low to medium |
| Joint case study | A customer project both were involved in is described together | medium | high |
| Joint event | A customer evening, an open workshop day, a booth at a regional trade show | high | high |
The thinking model: joint appearances rub off
Why a joint appearance is more than the sum of two audiences is explained by a model from brand research. Simonin and Ruth (1998) studied brand alliances, joint appearances of two brands. In a main study with 350 participants and two replications with 150 and 210 participants, they showed three things. First, attitudes toward the alliance shape the later image of each partner. They called this a spillover effect. Second, the evaluation of the alliance depends on whether the products fit together, product fit, and whether the brands fit together in reputation and image, brand fit. Third, the partners are not affected equally.
The third point is the most important for small businesses. According to Simonin and Ruth, an alliance has a stronger effect on less familiar brands than on familiar ones, because little is yet established about them. A small business appearing with a well-known partner therefore gains more than it gives. The reverse also applies: an appearance that fails shapes the image of the smaller partner more strongly. Schnittka and colleagues (2017) broke down spillover effects further and showed that partners can also rub off on each other directly, not only through the joint offer, and that the type of fit plays a role.
Source: Simonin and Ruth (1998)
For a business this means: a joint webinar is not just a route to new contacts. It is a statement about whom the business wants to be mentioned in the same breath with. That statement should be made deliberately.
Opportunity or risk: two views
The first view emphasizes the opportunity. Partner marketing almost doubles reach at almost no cost, because each partner invites its own contacts. A prospect who trusts one partner transfers part of that trust to the other. For a small, little-known business, this is even especially valuable according to the findings of Simonin and Ruth. In an experiment with co-branded credit cards, Chen and Lien (2018) also found that an alliance of a weaker host brand and a strong partner was rated better than the reverse combination. In addition, two experts with different perspectives on a topic often deliver better content than one alone.
The second view emphasizes the risk. Appearing together means giving up some control: over tone, over the quality of the talk, over how inquiries are handled. A partner who bombards participants with advertising after the webinar or does not respond to inquiries harms both. And partnerships often fail not at the start, but because nobody takes responsibility for the second date after the first.
I consider both views accurate and derive a sequence from them: first check fit, then start small, then evaluate. An article swap costs little and shows how reliably a partner works. Only after that is a joint webinar or event worthwhile. This matches the finding in the article setting up sales partnerships that trust is not the starting capital of a partnership but its return, as the commitment-trust theory of Morgan and Hunt (1994) suggests.
The fit test: three questions before the first joint appearance
From the brand alliance model I derive a check that I call the fit test. It consists of three questions. Only if all three are answered with yes is the joint appearance worthwhile.
Same customers without competition?
Do both businesses address the same target customers without competing for the same order? Those who share customers but not services have a good basis. Those who offer the same service are competitors, not partners.
Complementary services?
Do the two services make sense together from the customer's point of view, for example because they are needed one after the other in the same project? This corresponds to product fit in Simonin and Ruth.
Similar attitude?
Do the businesses match in reputation, quality standards and treatment of customers? Would you recommend the partner to a good customer without hesitation? This corresponds to brand fit.
The third question is the hardest because it cannot be answered from documents. Three checks help: read the partner's reviews and references, talk to a shared customer, and experience the partner once in a small task, for example an article swap.
Three formats that suit small businesses
The joint webinar
A joint webinar is the format with the greatest impact if both partners answer part of the customer's question. The process follows the three-act plan from the article webinars and talks: invite, present, follow up. With two partners, one task is added: deciding who follows up with whom. The simplest rule is that each partner follows up with the participants it invited itself and passes on questions concerning the other partner with the participant's consent.
Worked example with freely chosen figures. About half of the 100 registrations come from contacts the other partner would not have reached alone.
The joint specialist article and the article swap
A joint guide in which each partner describes its part of a project shows the reader the whole route. An article swap is even simpler: each writes a guest article for the other's newsletter or website. How guest articles are written and reused is described in the article guest articles in trade media. How one article becomes several formats is described in the article reusing content.
The mutual referral
The simplest form is a deliberate, mutual referral: on the website under partners, in the proposal as a next step, in conversation when a customer needs a service the partner offers. The rules from the article referral marketing apply here: create a clear occasion, make the route easy and say thank you. Bonuses between businesses should be agreed openly and checked.
What should be agreed in writing beforehand
Joint marketing does not need a long contract, but it does need a written one-page agreement. It prevents the most common disputes, which only arise after the joint appearance.
| Item | What is defined | Why |
|---|---|---|
| Goal and figure | What the appearance should bring, for example conversations with suitable prospects | Without a goal, nothing can be evaluated |
| Tasks | Who writes, who designs, who invites, who moderates | Unclear tasks are left undone |
| Data | Who receives which contact data, for what, and how this is disclosed at registration | Data protection and participants' trust |
| Follow-up | Who contacts whom, within what time frame | Duplicate or missing messages harm both |
| Content and approval | Who approves texts and slides, who may use them afterwards | Disputes over rights to joint content |
| Evaluation | When and with which figures the joint evaluation takes place | Otherwise there is no second appearance |
The data item deserves special care. Contact lists are not exchanged between partners. Each partner writes only to its own contacts. If registration data for a joint webinar are to be made available to both partners, this must be stated clearly at registration and requires a legal basis, which for email advertising usually means consent. An overview is given in the article data protection in sales. This is not legal advice.
What follows beyond the individual appearance
Joint marketing is a form of trust that becomes public. Customers see whom a business works with and draw conclusions about its standards. A simple rule follows: partners are selected by the same standards as employees with customer contact. A partnership that sustains several joint appearances is often also the beginning of a sales partnership or joint projects.
The limits of the findings are clear. The studies on brand alliances are based on experiments with consumers and consumer goods brands, not on business customers and small service providers. Whether spillover effects are equally strong in B2B cannot be derived from them. What transfers is the mechanism: what appears together is judged together. How much a joint appearance actually brings a small business is shown only by its own evaluation with the source partner in the inquiry list.
Conclusion and next steps
We set out to ask joint marketing with partners is worthwhile, which formats are suitable and what must be agreed beforehand. The answer: it is worthwhile if both businesses serve the same customers with complementary services and match in reputation and attitude, because joint appearances rub off on both, more strongly on the less familiar partner. For small businesses, article swaps and mutual referrals are suitable first, followed by the joint webinar. Agreed beforehand are the goal, tasks, the handling of data, follow-up and a date for evaluation.
- List three businesses that serve the same customers with a different service.
- Answer the three fit test questions for each.
- Agree an article swap with the best-fitting partner.
- Write the one-page agreement, including data and follow-up.
- Create the source partner with the partner's name in the inquiry list.
- After the first appearance, evaluate together and decide on the second.
You do not find good partners by asking many, but by looking closely at whom your own customers already value.
Frequently asked questions
What is partner marketing?
Partner marketing, also co-marketing, means joint marketing activities of two independent businesses with the same target customers and different services, such as a joint webinar, a joint specialist article or mutual referrals. Each partner contributes its contacts, and both gain reach.
How do I find a suitable marketing partner?
Ask your customers which other providers they work with on the same projects and are satisfied with. Then check three questions: same customers without competition, complementary services, similar attitude. A small first step such as an article swap shows how reliable the partner is.
May I share contact data with a partner?
Generally not without a legal basis. Each partner should write only to its own contacts. If registration data for a joint webinar are to be available to both, this must be stated clearly at registration, and email advertising usually requires consent. This is not legal advice.
Who follows up after a joint webinar?
Most simply, each partner follows up with the participants it invited itself. Questions concerning the other partner are passed on with the participant's consent. The rule should be fixed in writing before the webinar.
Can joint marketing harm my business?
Yes, if the partner does not fit. Studies on brand alliances show that joint appearances rub off on the image of both partners, more strongly on the less familiar one. A partner with a poor reputation or unreliable treatment of customers therefore harms you too.
What is the difference from a sales partnership?
In partner marketing, businesses promote together but sell separately, usually without commissions. In a sales partnership, they win or serve customers together, for example through subcontracting, a joint offer or resale.
Sources
- Simonin, B. L.; Ruth, J. A. (1998): Is a Company Known by the Company It Keeps? Assessing the Spillover Effects of Brand Alliances on Consumer Brand Attitudes. Journal of Marketing Research, 35(1), 30-42.
- Schnittka, O.; Johnen, M.; Völckner, F. et al. (2017): The impact of different fit dimensions on spillover effects in brand alliances. Journal of Business Economics, 87(7), 899-925.
- Chen, C.-W.; Lien, N.-H. (2018): Consumer evaluations of service co-branding. Service Industries Journal, 38(13/14), 995-1016.
- Morgan, R. M.; Hunt, S. D. (1994): The Commitment-Trust Theory of Relationship Marketing. Journal of Marketing, 58(3), 20-38.
Note. The legal notes describe the situation as of November 2026 in simplified form and are not legal advice.
