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Grava Nancy L: insider trades

Officer at Vicor Corp. No open-market purchases and 12 sales not made under a pre-set plan, reported from July 31, 2018 to May 28, 2026.

What happened after Grava Nancy L’s sales?

After their sales, the shares moved −11.2% against the index over 12 months on average (a negative figure means selling was the right call); 56% 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 12 −3.1% −11.6% 67% 7 −0.01 1.00 No reliable evidence
Sales, 12 months after the report 9 −11.2% −31.5% 56% 6 −0.18 0.86 No reliable evidence
Sales, 12 months after the trade 9 −14.8% −27.7% 56% 6 −0.42 0.69 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
Vicor Corp VICR VP Human Resources012July 31, 2018May 28, 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
May 28, 2026May 27, 2026 VICR Sale $114,665 −45.9%not yetnot yet
May 7, 2026May 5, 2026 VICR Sale $1,434,180 −23.7%not yetnot yet
February 25, 2026February 24, 2026 VICR Sale $489,192 +56.6%not yetnot yet
October 27, 2025October 23, 2025 VICR Sale $639,912 +90.0%+117.3%+94.3%
May 6, 2024May 3, 2024 VICR Sale $43,303 +8.7%+13.5%+9.9%
July 31, 2023July 27, 2023 VICR Sale $291,648 −46.1%−75.7%−79.8%
October 26, 2021October 25, 2021 VICR Sale $300,000 −38.7%−51.9%−53.0%
August 3, 2021July 30, 2021 VICR Sale $230,180 +22.2%−31.5%−33.1%
March 12, 2021March 10, 2021 VICR Sale $192,000 −10.1%−35.3%−27.7%
December 17, 2020December 15, 2020 VICR Sale $393,665 −13.2%+0.8%+1.3%
September 10, 2020September 9, 2020 VICR Sale $416,900 −7.8%+18.9%+12.8%
July 31, 2018July 26, 2018 VICR Sale $450,000 −29.6%−56.8%−58.4%

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