Usually, trademark fights follow a predictable shape. The big, famous brand sues the small upstart for trading on its name. This one runs the other way. The University of Indianapolis — a private school of about 4,700 students — has sued Indiana University, a public system with more than 90,000 students across its campuses, over three letters: “IU.” And UIndy’s argument isn’t that IU is too small to be confused with. It’s that IU is too big not to be.

What Happened

On August 11, 2026, UIndy filed suit against IU in the U.S. District Court for the Southern District of Indiana, alleging trademark infringement, unfair competition, and false designation of origin. The dispute traces back to July 1, 2024, when Indiana University and Purdue University dissolved their joint IUPUI campus and split it into two separate schools: IU Indianapolis and Purdue in Indianapolis. In rebranding its half of the split, IU began using “IU Indy” across its website, promotional materials, and athletic uniforms.

One problem: UIndy has owned a federal registration for “UINDY” since 2003 — more than two decades of exclusive use before IU Indy existed. IU actually filed its own trademark application for “IU Indy” in February 2024, months before the split took effect. UIndy opposed that application in 2025, and the opposition never resolved. Now it’s a lawsuit.

The two names are separated by one letter. “UIndy.” “IU Indy.” Say them out loud and the difference nearly disappears.

The Legal Theory: Reverse Confusion

Here’s where the doctrine gets interesting, and where most people’s intuition about trademark law breaks down.

The classic trademark infringement story is “forward confusion”: a small, unknown company uses a name close to a famous brand’s, and consumers assume the small company is affiliated with — or is somehow riding the coattails of — the famous one. Think of a no-name soda calling itself “Coca-Cola Classic Plus.” The little guy is trying to borrow the big guy’s reputation.

UIndy isn’t making that argument, because it can’t. UIndy is the older, smaller, less nationally known name here. So instead, UIndy is alleging “reverse confusion” — a less common but well-established theory where the roles flip. In reverse confusion, a larger, more powerful junior user (IU, in this case) adopts a mark so close to a smaller senior user’s mark that the market starts to assume the senior user — the one who had the name first — is the newcomer, copycat, or unauthorized affiliate. The senior trademark holder doesn’t need the big guy’s fame to make its case. It needs the opposite: it needs to show the big guy’s fame is drowning it out.

In other words, UIndy isn’t worried that people will think it’s associated with IU. UIndy is worried that thirty years of brand-building around “UIndy” will simply be swallowed by an institution nine times its size using a nearly identical name, until the public assumes IU Indy came first and UIndy is the one riding coattails — even though the registration timeline says the exact opposite.

Why UIndy’s Case Isn’t Just Theoretical

Trademark law doesn’t protect a name because a company likes it. It protects a name because consumer confusion causes real, measurable harm — misdirected customers, diluted goodwill, lost sales. UIndy’s complaint leans on exactly that kind of evidence, not just the abstract unfairness of a bigger school using a smaller school’s near-identical name.

UIndy President Tanuja Singh pointed to a concrete example: mistaken deliveries — including deliveries intended for prospective students — showing up at the wrong campus. “It’s not hurting just us,” Singh said. “It’s hurting them as well.” That’s a notable admission threaded into UIndy’s own argument: reverse confusion, done right, is bad for both sides, not just the smaller one. When your name and mine are one letter apart, every mixed-up FedEx package, misdirected campus tour, and confused prospective-student inquiry is evidence for a lawsuit.

UIndy is also alleging harm to merchandise sales — arguing that revenue from IU gear bearing the disputed name represents profits UIndy should be able to recover.

What UIndy Is Asking For

The relief sought tells you how seriously UIndy is treating this: a permanent injunction blocking IU’s use of the “IU Indy” marks, cancellation of IU’s pending trademark applications, disgorgement of IU’s profits tied to the disputed name, and punitive damages and attorney’s fees on top of it. That’s not a cease-and-desist letter dressed up as a lawsuit. That’s a full request to unwind IU’s rebrand.

IU, for its part, isn’t saying much. A university spokesman offered the standard line: “The university does not comment on litigation.” UIndy’s spokesman struck a more conciliatory tone, saying the school will “allow the legal process to proceed and remain hopeful that this matter can be resolved.”

The Takeaway for Business Owners

You don’t need a university’s budget to learn something from this case. Three things are worth taking away, regardless of what industry you’re in.

First, registering your name early matters — and it matters for longer than you’d think. UIndy’s registration dates to 2003. Twenty-plus years later, that registration is the entire foundation of its case against an institution roughly twenty times its size by enrollment. If you’re pitching it, you should be protecting it, and the earlier you file, the stronger the ground you’re standing on when a much bigger competitor eventually shows up next door.

Second, size cuts both ways in a trademark dispute. Most founders assume the danger is a small company copying a big one’s name. Reverse confusion is the reminder that the danger also runs the other direction: a much larger competitor adopting something close to your name can erase your market identity even without any intent to trade on your goodwill. If a bigger player enters your space with a name that echoes yours, that’s not a coincidence to shrug off — it’s a trademark problem to evaluate immediately.

Third, oppositions don’t resolve themselves. UIndy opposed IU’s trademark application back in 2025. That opposition sat unresolved until UIndy escalated to federal court. If you’ve filed an opposition and it’s stalled, stalling isn’t neutral — it’s time your competitor gets to keep building brand recognition around the name you’re disputing.

How Martin IP Law Group Can Help

Watching for confusingly similar marks — before they cost you customers, merchandise revenue, or years of brand equity — is exactly what proactive trademark counsel is for. Whether you’re the university that’s been using a name since 2003 or the growing company that just noticed a much bigger competitor edging into your name space, the time to act is before the misdirected deliveries start piling up, not after.

If you’re concerned about a name that’s a little too close to yours — in either direction — we’d welcome the conversation.