Batchmate Co-Marketing: Growth from Your Accelerator

Co-marketing with accelerator batchmates means teaming up with the two to five companies in your own YC, Techstars, or 500 cohort whose buyers overlap yours, and trading access to each other's audience through shared launches, newsletters, webinars, and bundled offers. It is the cheapest distribution asset you will ever have, and almost no one in your batch uses it.

TL;DR

• Your batch is a pre-qualified partner pool: founders you trust, similar stage, similar buyer, zero cold outreach required.
• Pick 3-5 batchmates with overlapping ICP, non-competing products, similar list size, and a founder who actually ships.
• Start with low-effort formats like swapped newsletters and joint launch days, not a quarter-long campaign.
• Track every campaign with unique UTM links and one agreed metric per side, reviewed on a fixed date.
• Most failures come from audience mismatch, one-sided effort, and zero tracking - all preventable in a one-page brief.

What Is Batchmate Co-Marketing and Why Does It Work at Pre-Seed?

Batchmate co-marketing is a partnership motion where two or more companies from the same accelerator cohort promote each other to their respective audiences. It is a specific, high-trust subset of partner marketing, and it works for one reason: you already have what every cold partnership program spends months trying to buy.

You have trust. You shared the same application, the same demo day pressure, the same group chats. That shared history lowers the activation energy for a joint campaign to almost zero. You also have timing alignment - every company in your batch is trying to grow at the same moment, with the same constraints and roughly the same audience size. That makes reciprocity natural in a way it rarely is with a larger, more established partner.

At pre-seed this matters because you have no brand and a thin budget. Paid acquisition asks you to buy attention; a batchmate asks only that you trade it. A swapped newsletter mention reaches a warm, relevant list for the cost of a few hours of writing.

How Do You Pick Which Batchmates to Co-Market With?

Do not co-market with your five favorite people. Co-market with the five companies whose audiences you would pay to reach. Score each batchmate against these criteria.

• ICP overlap: would a meaningful share of their customers also buy from you? If not, skip them regardless of how friendly you are.
• Non-competing adjacency: the best partners sell to the same buyer but solve a different problem. Two devtools that both sell to platform engineers are adjacent; two that both sell log analysis are competitors.
• Similar list size: a swap only feels fair when the audiences are roughly equal. If one side has 10,000 subscribers and the other has 300, the exchange is not reciprocal, and it will silently decay.
• Someone who ships: pick the founder who has been posting and launching, not the one who has been quiet since orientation. Effort asymmetry is the number one killer of these campaigns.

Build a short list of 3-5 and stop there. Two well-run campaigns with the right companies beat a scattergun of ten half-hearted swaps.

Which Co-Marketing Formats Work Best in a 12-Week Batch?

Not every format fits a pre-seed team. The table below ranks the formats that are realistic to ship inside a single batch cycle, ordered roughly from lowest to highest effort.

Start with the top two rows. A swapped mention and a joint launch day prove the audience responds before you invest a month in a co-authored report.

How Do You Pitch a Batchmate on a Joint Campaign?

The pitch should take less than a minute to read and make saying yes trivial. Keep it to a short template rather than a deck.

1. Name the overlap: "We sell to [shared ICP]. You sell to [shared ICP]. We do not compete."
2. Propose one concrete, low-effort format: a swapped newsletter mention, not a vague partnership.
3. Lead with what they get: audience size, list quality, and a specific number or segment if you have it.
4. Do the work for them: attach draft copy and a pre-made tracking link so their cost is an approve-click.
5. Put a date on it: "Send Thursday, I send Thursday, we check numbers next Friday."

The founding insight is that you are not asking for a favor - you are offering a fair trade between peers. State it that way.

How Do You Run a Batchmate Campaign in One Week?

A week is enough for the formats that matter at pre-seed. Here is a working sequence.

1. Day 1: pick the partner, agree on the format and the one metric each side cares about, and write a one-page brief.
2. Day 2: draft both sides' copy and creative. Doing the drafting yourself is how you guarantee the thing ships.
3. Day 3: generate unique UTM links for each direction so results are separable later.
4. Day 4: send assets for review, agree on the send or publish time, and coordinate any announcement posts.
5. Day 5: launch, share on your own channels, and agree on the reporting date (typically one week out).

Resist scope creep. Every added asset or extra channel is another week of delay and another chance the partner drops off.

How Do You Track Results So It Is Not Vibes?

The difference between a co-marketing campaign and a nice hangout is whether you can point to a number. Instrument it before launch.

• Unique UTMs: every mention, link, and QR carries source, medium, campaign, and partner parameters. See our UTM tracking guide for the exact scheme.
• A shared sheet: one lightweight doc where both sides log clicks, sign-ups, and any booked demos or revenue, so there is no disagreement about what happened.
• One metric each: agree on a single primary number per company before you start, so success is defined in advance rather than argued about after.
• A fixed reporting date: schedule the check-in when you launch. Campaigns that never get a review date never get reviewed.

Compare partner-sourced sign-ups against your other channels. If a batchmate's audience converts better than your paid traffic, that is a signal to double down on the relationship.

What Are the Failure Modes of Batch Co-Marketing?

These four problems account for almost every batchmate campaign that quietly dies.

All four are preventable with the selection and tracking rules above. The common thread is that they are diagnosed late because nobody wrote down the plan.

How Do You Keep the Relationship Producing After Demo Day?

Demo day is the peak of batch energy, not the end of it. The companies worth co-marketing with are worth a post-batch cadence, and it requires almost no maintenance if you set it once.

Agree on a recurring lightweight ritual: a monthly swapped mention, a quarterly joint webinar, or a standing "who is launching this month" check-in. Log every campaign's results in the shared sheet so the next one starts from evidence rather than memory. Fold the best partners into your broader post-accelerator growth plan instead of treating them as a one-off demo day stunt.

Batchmates are also your fastest route into new networks after the program ends, because each one brings their own alumni, investors, and customers. Nurture the three that actually convert, and let the rest stay friendly on the group chat.

Frequently Asked Questions

Is Batchmate Co-Marketing Worth It If Our Products Barely Overlap?

No. The entire mechanism depends on ICP overlap, so forcing a campaign with a batchmate whose buyers do not resemble yours wastes both sides' time. Pick a different batchmate or a different motion. For the broader accelerator marketing context, our marketing guide for accelerator startups covers the channels that work when a tight co-marketing partner is not available in your batch.

How Many Batchmates Should We Co-Market with at Once?

Aim for two or three active campaigns at a time, and run them properly rather than starting ten. Each campaign has real coordination cost - briefs, copy, tracking, follow-up - and the returns diminish fast once you stretch past a handful. Prioritize the three batchmates with the strongest audience overlap and shipping cadence, and add more only after one of those campaigns pays out.

Should We Co-Market with a Batchmate Before or After Demo Day?

Before, if you can. The weeks around Demo Day concentrate attention, so a joint launch in that window reaches a warmer, more engaged audience. But the relationship matters far more after Demo Day, when most of the batch goes quiet. Use demo day marketing for the announcement spike, then keep the recurring cadence running into the post-batch months.

What If a Batchmate Is Clearly Not Pulling Their Weight?

Stop feeding the relationship, politely. One gentle nudge is fine, but if you are drafting, scheduling, and promoting while they only approve, the asymmetry will not fix itself. Let the campaign finish, log the results, and quietly move your effort to a partner who ships. Effort symmetry matters more than raw audience size in these campaigns.

If you want a hand running your first batchmate campaigns, our take on turning accelerator networks into traction is the natural next read.