Marzetti just closed the best fiscal year in its history, and a microscopic parasite may have already started erasing the proof.

The Columbus, Ohio food company, best known for salad dressings and dipping sauces but increasingly the owner of faster-growing brands, reported a fourth consecutive year of record net sales and gross profit in fiscal 2026. Gross margin hit 24.5%, the twelfth straight quarter it improved. Operating cash flow reached $283.8 million, a record. The company raised its dividend for the 63rd consecutive year. By almost any internal measure, this was a company that had figured something out.

Then came the Cyclospora outbreak.

What the outbreak actually means

Cyclospora is a foodborne parasite that causes intestinal illness. It does not appear in Marzetti's products themselves, but outbreaks create a gravitational pull on consumer behavior: people get cautious about fresh or prepared foods broadly, retailers get nervous, and foodservice buyers delay orders. Management expects the outbreak to shave roughly 250 basis points (about 2.5 percentage points) off first-quarter net sales across both retail and foodservice. That may sound small, but it arrives precisely when Marzetti was compounding strength on strength.

CFO Tom Pigott said the company does "not expect to be able to grow our margins" in the first quarter. Guidance points to a roughly 15% decline in first-quarter operating income. For context: Marzetti had been growing adjusted operating income at 17.5% in the quarter just reported. A 15% drop in one quarter does not undo a year of gains, but it does illustrate how quickly an external event can invert a clean trend.

The company is modeling its recovery on a similar 2018 Cyclospora episode. That one took about four months to fade. If history holds, the damage is temporary and contained.

The business underneath the scare

The reason this matters beyond one bad quarter is what Marzetti had built going into it.

The headline quarterly sales number actually fell 2.2% to $465 million, but that drop traces entirely to the planned expiration of a temporary supply agreement. Strip that out and the underlying business grew. More importantly, the growth is shifting toward newer, faster-moving brands.

Bachan's, a Japanese-style barbecue sauce brand Marzetti acquired mid-year, added $15.4 million in sales in its first two months alone, with distribution points up 16.6% and household penetration climbing. Management is now pushing the brand into mayonnaise (a category it estimates at $3.4 billion in potential) and into wing sauce made at its Kentucky plant. Texas Roadhouse branded dinner rolls grew 76% for the full year to $58 million, selling nearly twice as fast per distribution point as the category average. New York Bakery took its share of the crouton market to 45.5%, a leading position.

This is not a company riding one legacy product. It is actively remaking its portfolio around brands that are gaining ground, not losing it.

The pattern worth watching

Marzetti's situation captures something broader about how food companies compete right now. Sustained margin improvement, in twelve straight quarters of it, comes from grinding operational work: procurement changes, manufacturing efficiency, network consolidation. It is slow and hard to replicate. But it can be interrupted almost instantly by something entirely outside a company's control, whether that's a parasite outbreak, a supply chain disruption, or a commodity price spike.

The 2018 precedent is mildly encouraging. Four months is a long quarter, but it is not a broken business. If the recovery tracks that timeline, Marzetti enters fiscal 2027 with its brands intact, its cash generation strong, and the streak technically paused rather than ended.

The parasite is real. So is what was built before it arrived.