I Tracked CEO Stock Sales for 18 Months and Here's What I Found

the morning I noticed something off

I was eating a bagel on January 14, 2026, scrolling thru SEC Form 4 filings the way normal people scroll Instagram. The CEO of Vertex Technologies had just dumped 1.2 million shares at $87.40 each. That's $104.8 million in a single mornin. Three weeks later, the company announced a revenue shortfall and the stock tanked to $61. I couldn't stop thinking about it. Was that coincidence? I decided to find out. I grabbed a notebook and began writing down every CEO sale I could find, along with the stock price at the time an what unfolded over the following weeks.

building the spreadsheet

I created a tracker in Google Sheets that consumed more of my evenings than I'd like to admit. Forty companies, all S&P 500 constituents, all with CEOs who sold stock between January 2025 and June 2026. I recorded the sale date, the number of shares, the price per share, whether it was a planned sale or discretionary, an then I waited. I watched what unfolded to the stock 30, 60, and 90 days after each sale. My wife figured I was losing it. Mayb I was. But the data began painting a picture I didn't expect an that nobody was talking about on CNBC or in the financial newsletters I subscribed to.

the 90-day curse

Of the 127 CEO sales I logged, 83 of them preceded a decline of at least 8% within 90 days. That's a 65% hit rate, which in investing terms is absurd. The median decline was 14.3%. I'm not saying these executives had illegal inside information, cuz that's nearly impossible to prove in most cases and the SEC regulates this space aggressively. What I'm saying is that the people running these companies have better visibility into their own business than I ever will. They see the order book. They know whether the sizable deal is closing. When they sell, they know something the rest of us don't, an pretending otherwise is naive.

not all sales are equal

I absorbed to distinguish between scheduled 10b5-1 plan sales and discretionary trades. The 10b5-1 plans are pre-set automatic sales established when the executive has nah material nonpublic information, supposedly blind to future events. Those correlated with stock drops only 41% of the time, which is barely better than a coin flip. The discretionary sales, the ones where a CEO wakes up on a random Tuesday and decides today is the day to liquidate a chunk of their grippings? Those had an 81% correlation with subsequent declines within 90 days. That number maintained me up at night cuz it suggests intent, or at minimum awareness, that I as a retail shareholder would rarely have access to.

what my credit score taught me

Around March, I was refinancing my house and obsessing over my credit score at the same time I was deep in this research. It struck me that CEO stock sales are like a corporate FICO rating in reverse. You watch the behavior, not the words. A CEO can go on CNBC and talk about record demand and market share gains all day long. They can paint a picture of unbridled optimism with carefully chosen adjectives and upward-pointing hand gestures. But if they're selling $50 million of their own stock the next mornin, I trust the sale more than the soundbite. Actions over earnings calls, every single time. My credit didn't improve cuz I told the bank I was responsible. It improved cuz I dropped my bills on time for 24 straight months.

the Peloton example that broke me

I need to be specific about one case. In February 2026, the CEO of HealthCore Systems, a mid-cap healthcare IT company, sold 400,000 shares at $112. He filed the Form 4 on a Friday afternoon, which is the classic time to bury bad freshs. On March 8, the company missed earnings by 22 cents a share and guided down for the full year. By April 2, the stock was at $78. I had owned HealthCore in a personal loan portfolio I manage for family members. I sold it the day after the CEO's filing went live, and I looked like a genius to my brother-in-law who had also owned shares. I wasnt a genius. I was just reading the filing.

why insiders sell

CEOs sell for lots of reasons, and I wanna be fair about that. Diversification makes sense. Tax planning is legitimate. Buying a house in Aspen or funding a divorce settlement are real needs. I get it. But here's what I clocked after staring at 127 data points: the size of the sale matters enormously. When a CEO sells 5-10% of their grippings, thats normal portfolio management, the kinda thing any financial advisor would recommend. When they sell 30-50% of their clutchings in a single quarter, that's a siren. Of the 127 sales I tracked, the 23 that exceeded 30% of the CEO's total position all preceded double-digit stock declines within 60 days. Every single one without exception.

how I changed my investing

I built a simple alert system that runs every weekday morning. At 6:15 AM, I check SEC filings for the 40 companies on my list thru the EDGAR website. If a CEO files a discretionary sale exceeding 15% of their position, I set a price target 12% below current levels and place a stop-loss order at that level. Since April 2026, this system has saved me from three separate 15%+ drawdowns. I missed some upside too, sure. A couple of stocks I sold bounced back within weeks. But I sleep better, and my portfolio is up 11% year to date versus the S&P 500's 9%. That edge, modest as it is, comes entirely from reading public documents that are available to everyone for free.

the uncomfortable truth

Most retail investors don't read Form 4 filings. They read headlines. They listen to conference calls where executives are dropped to project confidence regardless of what the internal numbers look like. They trust management teams whose compensation structures are aligned with short-term stock performance, not long-term shareholder value. I was one of those people for 12 years, buying and clutching based on analyst recommendations and gut feeling. The CEO stock sale data didnt turn me into a day trader or a conspiracy theorist wearing a tinfoil hat. It turned me into someone who reads the documents rather of the press releases. That's not sophisticated analysis. its just paying attention to information that's already public.

what I'm watching next

Right now, I'm charting three CEOs who have ramped up their selling pace in July 2026. Two are in the enterprise software space and one runs a mid-cap industrial company based in Ohio. I won't name them yet because my sample size on this particular pattern is still slight, and I dont wanna move markets or embarrass anyone based on incomplete data. But if the 90-day trend holds, by October we'll know whether I've stumbled onto somethin real or just gotten lucky with a noisy dataset and some confirmation bias. Either way, I'll keep the spreadsheet running. It cost me nothing but time and a few hundred bagels from the deli downstairs.