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Thaeder John M: insider trades

Officer at Artesian Resources Corp. No open-market purchases and 13 sales not made under a pre-set plan, reported from November 12, 2010 to August 29, 2025.

What happened after Thaeder John M’s sales?

After their sales, the shares moved −5.0% against the index over 12 months on average (a negative figure means selling was the right call); 62% 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 13 −4.5% −6.1% 77% 6 −0.79 0.46 No reliable evidence
Sales, 12 months after the report 13 −5.0% −9.2% 62% 6 −0.62 0.56 No reliable evidence
Sales, 12 months after the trade 13 −5.5% −8.3% 62% 6 −0.60 0.57 No reliable evidence

“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
Artesian Resources Corp ARTNA Senior Vice President013November 12, 2010August 29, 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
August 29, 2025August 28, 2025 ARTNA Sale $33,370 −10.3%−7.8%−9.1%
August 25, 2025August 22, 2025 ARTNA Sale $33,490 −9.0%−9.9%−10.1%
August 22, 2025August 21, 2025 ARTNA Sale $32,920 −7.9%−10.3%−8.3%
December 18, 2023December 14, 2023 ARTNA Sale $109,525 −25.8%−48.8%−50.8%
September 22, 2023September 20, 2023 ARTNA Sale $22,935 −11.5%−47.1%−46.3%
September 16, 2015September 14, 2015 ARTNA Sale $137,166 +11.4%+19.8%+14.1%
September 1, 2015August 31, 2015 ARTNA Sale $16,566 +11.5%+13.6%+18.5%
December 23, 2014December 22, 2014 ARTNA Sale $88,248 −3.7%+31.2%+31.9%
November 20, 2014November 18, 2014 ARTNA Sale $13,349 −0.7%+19.1%+11.9%
May 20, 2014May 16, 2014 ARTNA Sale $54,616 −6.1%−10.4%−11.7%
March 24, 2014March 21, 2014 ARTNA Sale $64,400 −4.1%−13.7%−14.3%
March 20, 2012March 16, 2012 ARTNA Sale $104,105 +7.2%+8.2%+6.0%
November 12, 2010November 10, 2010 ARTNA Sale $88,790 −9.0%−9.2%−2.6%

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 Thaeder John M traded and do not suggest the use of non-public information. How every insider compares · the insider trading backtest.