Skip to content
sellWeak10b5-1 plan

Mike Slessor sold $2.6M of FORM

CEO at FORMFACTOR INC. 39,606 shares at an average of $65.00, traded Jan 6, 2026, filed Jan 6, 2026.

Warning score
30
Value
$2.6M
39,606 shares
Holdings after
485,995
-8% from before
From 52-week low
+176%
low $23.18, close $64.00
From 52-week high
0%
high $64.00, as of Jan 6, 2026

Score components

  • Role
    CEO
    +25
  • Trade size
    $2.6M at market
    +25
  • Share of holdings sold
    Sold 7.5% of holdings
    0
  • Cluster
    No other insider selling within 14 days
    0
  • 10b5-1 plan
    Pre-scheduled under a 10b5-1 plan
    -20

What happened after comparable sells

Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.

This signal so far: 1m +31.0%, 3m +64.3%, 6m +65.7%.

Price around the trade, and since

From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.

FORMOct 12, 2026 · close 130.28
Since filing Jan 6, 2026: +103.6%SPY +13.4% · excess +90.2%

Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™

Rows in this filing

Every transaction in Form 4 0001628280-26-001019, as filed. Open on EDGAR

DateTransactionSharesPriceValueHoldings afterFiled
Jan 6, 2026SOpen-market sale
Common Stock10b5-1
-39,606$65.00$2.6M485,995Jan 6, 2026

Related signals

Other insiders at FORMFACTOR INC and this insider’s other filings.

ScoreCompanyInsiderValueHoldingsFiled
38Weak
FORMsell 210b5-1
FORMFACTOR INC
Mike Slessor
CEO
$1.8M
17,510 shares
-4%
35Weak
FORMsell 2
FORMFACTOR INC
Kelley Steven-Waiss
director
$202k
2,100 shares
-8%
30Weak
FORMsell10b5-1
FORMFACTOR INC
Mike Slessor
CEO
$2.1M
16,002 shares
-3%
24Weak
FORMsell10b5-1
FORMFACTOR INC
Mike Slessor
CEO
$560k
4,735 shares
-1%
46Moderate
FORMsell 3
FORMFACTOR INC
Thomas St Dennis
director
$424k
2,800 shares
-9%
45Moderate
FORMsell 310b5-1
FORMFACTOR INC
Mike Slessor
CEO
$1.4M
11,890 shares
-3%
72Notable
FORMsell 5
FORMFACTOR INC
Sheri Rhodes
director
$794k
6,328 shares
-54%
58Moderate
FORMsell 7
FORMFACTOR INC
Rebeca Obregon-Jimenez
director
$484k
3,828 shares
-33%
40Moderate
FORMsell 7
FORMFACTOR INC
Thomas St Dennis
director
$116k
1,000 shares
-3%
56Moderate
FORMsell 7
FORMFACTOR INC
Brian C White
director
$410k
3,250 shares
-27%

Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.

Mike Slessor sold $2.6M of FORM | InsiderTell