undamentalytics Newsletter
Sign in

Peterson Michael: insider trades

Officer at SEI Investments Co. No open-market purchases and 12 sales not made under a pre-set plan, reported from July 31, 2023 to September 1, 2026.

What happened after Peterson Michael’s sales?

After their sales, the shares moved −9.8% against the index over 12 months on average (a negative figure means selling was the right call); 100% 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 11 −3.4% −3.3% 82% 4 −0.31 0.78 No reliable evidence
Sales, 12 months after the report 8 −9.8% −11.6% 100% 3 — — Not enough years
Sales, 12 months after the trade 8 −9.2% −11.4% 100% 3 — — Not enough years

“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
SEI Investments Co SEIC Executive Vice President012July 31, 2023September 1, 2026

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
September 1, 2026August 28, 2026 SEIC Sale $4,181,625 not yetnot yetnot yet
July 30, 2026July 28, 2026 SEIC Sale $2,551,250 −1.5%not yetnot yet
April 23, 2026April 23, 2026 SEIC Sale $900,000 +11.2%not yetnot yet
November 13, 2025November 12, 2025 SEIC Sale $2,105,250 −2.2%not yetnot yet
August 8, 2025August 7, 2025 SEIC Sale $627,731 −11.0%−0.7%−1.6%
August 6, 2025August 5, 2025 SEIC Sale $60,664 −12.6%−1.6%−3.1%
August 4, 2025July 31, 2025 SEIC Sale $418,387 −17.0%−3.1%−1.5%
May 16, 2025May 15, 2025 SEIC Sale $4,213,500 −4.2%−18.7%−16.7%
November 8, 2024November 6, 2024 SEIC Sale $791,400 0.0%−11.3%−11.8%
October 29, 2024October 25, 2024 SEIC Sale $1,864,759 +9.8%−12.0%−11.6%
September 21, 2023September 19, 2023 SEIC Sale $1,532,250 −3.3%−18.7%−16.1%
July 31, 2023July 28, 2023 SEIC Sale $632,000 −6.1%−12.0%−11.2%

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