undamentalytics Newsletter
Sign in

Sakys John: insider trades

Chief financial officer at Mesa Laboratories Inc. No open-market purchases and 10 sales not made under a pre-set plan, reported from November 17, 2016 to June 18, 2025.

What happened after Sakys John’s sales?

After their sales, the shares moved −22.1% against the index over 12 months on average (a negative figure means selling was the right call); 90% trailed it.

With 296 insiders tested, some will look skilled or unskilled by chance alone: when we replaced each insider’s stocks with random companies bought on the same days, about 5.7 cleared the bar ahead and 23.3 behind. One record on its own proves little.

Trade by trade

MeasuredTrades countedAverage vs S&P 500MedianWent the right wayYearst-statisticp-valueEvidence
Purchases, 3 months after the report 0 — — — — — — Not enough years
Purchases, 6 months after the report 0 — — — — — — Not enough years
Purchases, 12 months after the report 0 — — — — — — Not enough years
Purchases, 12 months after the trade 0 — — — — — — Not enough years
Sales, 3 months after the report 10 −5.9% −4.6% 60% 6 −1.17 0.29 No reliable evidence
Sales, 12 months after the report 10 −22.1% −19.3% 90% 6 −3.26 0.022 Some evidence: seller right
Sales, 12 months after the trade 10 −21.9% −20.9% 90% 6 −3.44 0.018 Some evidence: seller right

“Average vs S&P 500” is the stock’s return including dividends minus the index’s over the same dates, from the close on the first trading day after the report, or from the close on the trade date. Only windows that have finished are counted. For sales, a negative figure means the stock lagged after it was sold, so selling was the right call (green). “Went the right way” is the share of purchases that beat the index, or of sales that trailed it. The t-statistic uses one average per year of reports, because one person’s trades bunch into the same stock and weeks, and needs trades in at least four different years; the p-value comes from the t distribution with that number of years (with four years, a t of 2 has p = 0.14). “Some evidence” means p under 5%, “strong evidence” p under 1% over at least six years.

Companies traded

CompanyTitle on the latest filingPurchasesSalesFirst reportLatest report
Mesa Laboratories Inc MLAB CFO010November 17, 2016June 18, 2025

Trades and what followed

Moves are against the S&P 500; green means the trade went the insider’s way.

ReportedTradedCompanyTradeValue3 months after report12 months after report12 months after trade
June 18, 2025June 16, 2025 MLAB Sale $62,351 −35.5%−28.1%−24.8%
August 17, 2022August 15, 2022 MLAB Sale $401,135 −0.9%−34.9%−34.2%
June 22, 2022June 21, 2022 MLAB Sale $135,895 −26.5%−51.4%−48.5%
November 12, 2021November 11, 2021 MLAB Sale $317,120 −11.7%−24.8%−29.6%
July 6, 2021July 1, 2021 MLAB Sale $267,040 +9.6%−16.7%−12.9%
June 17, 2021June 16, 2021 MLAB Sale $541,765 +13.8%−16.9%−18.1%
March 15, 2021March 12, 2021 MLAB Sale $659,600 −8.4%−14.2%−14.6%
August 17, 2020August 14, 2020 MLAB Sale $244,000 +11.7%−18.8%−23.7%
August 15, 2018August 15, 2018 MLAB Sale $203,500 +1.9%+4.4%+3.1%
November 17, 2016November 15, 2016 MLAB Sale $127,140 −13.0%−19.8%−16.1%

Open-market purchases and sales of at least $10,000 in companies we cover, from SEC Form 4 filings; sales made under a pre-set Rule 10b5-1 plan are not shown. “Not yet” means the window has not finished or the share price was under $5 at entry. These are the shares’ moves after each trade: they say nothing about why Sakys John traded and do not suggest the use of non-public information. How every insider compares · the insider trading backtest.