On Holding Co-Founders Buy $4M of ONON in One Day

The co-founders of On, the running shoe brand, just bought $4 million of their own stock in a single day

On August 14, two co-founders of On Holding, the Swiss running shoe company, each bought 65,000 shares of $ONON on the open market for roughly $4 million between them. Co-CEO Caspar Coppetti paid about $2.0 million. Fellow co-founder Olivier Bernhard paid about $2.0 million. Both sets of fills landed at a weighted average of $30.67, right after the stock dropped more than 20% on Q2 earnings. NexusAlert flagged both Form 4 filings the morning they hit EDGAR on August 17, tagged them High severity, and stacked them with insider buy, ceo purchase, and large purchase flags.

What actually happened

On is the sportswear brand behind On running shoes and the Cloud franchise, the label Roger Federer backs and wears courtside. The stock has been a momentum favorite, but a soft Q2 print knocked it more than 20% lower, toward $30 and its 12-month lows. That is the backdrop for these buys.

Caspar Coppetti is one of On’s three founders and became Co-CEO on May 1, 2026. He paid personal cash for 65,000 Class A shares and now holds 2,440,855 $ONON directly. This was a code P open-market purchase. It was not a grant, not an option exercise, and not a 10b5-1 automated plan. Olivier Bernhard, another founder and an executive on the board, bought the same 65,000 shares the same day, and he had already added about $1.9 million more back in May.

Is a founder buy a reliable bottom signal?

Not on its own. Executives sometimes buy for optics, and a single purchase near a low can be a coincidence rather than a call. Healthy skepticism is warranted.

Context is what tips it. This is not one insider nibbling. It is two of the three people who built the company, buying the same size on the same day, in cash, at a price the market just marked down hard. One founder buying is conviction. Two founders buying together is a message.

The misconception this filing exposes

Here is where the insider data can fool you. Pull up On’s activity and one number looks bearish: 15 Form 144 notices, about $43.6 million of planned selling on file. It reads like insiders heading for the exit.

Look closer. A Form 144 is a notice of intent to sell, often routine diversification run through preset plans, and it says little about conviction. The number that captures conviction points the other way. Net insider flow is +$11.4 million, and it is buying, driven by the two founders writing personal checks at the lows.

You can explain away an insider sale a dozen ways. A founder buying at the lows explains itself.

The bigger picture

NexusAlert’s Company Dossier scores On 9.0 out of 10 on Insider Conviction, the top 10 percent of companies it rates. Most of the other pillars are unrated, because On files as a Swiss foreign private issuer with thin US financial disclosure. That gap is exactly where insider-flow detection earns its keep: when the fundamentals screens go dark, a founder’s checkbook is one of the few hard signals left. The Dossier also notes that insider buys like this have a median abnormal return of 2.5 percent across 517 prior cases since November 2025, which describes the past rather than predicting the next move.

The lesson

Read the filing, not the headline number. A scary “$43.6 million of planned selling” line can sit one row above the signal that actually matters: founders buying at the lows, in cash, on the same day. NexusAlert reads every Form 4 the moment it files, classifies the transaction type, and tells you whether it is genuine conviction or just paperwork.

Create a free NexusAlert account and see how it separates the signal from the noise on any ticker you follow.

Sources

• SEC EDGAR: On Holding AG Form 4 filed August 17, 2026 (Caspar Coppetti)
• The Motley Fool: On Holding Founder and Co-CEO Caspar Coppetti Buys the Dip
• The Motley Fool: On Holding Executive Olivier Buys 65,000 Shares for $2.0 Million
• On: Co-Founders to Lead Next Chapter of Growth as Co-CEOs
• On Holding AG (ONON) stock overview, Yahoo Finance

This analysis is for informational purposes only and is not financial advice. Insider transactions cited here come from public SEC filings and reflect lawful, disclosed activity.