Skip to content
sellWeak cluster of 510b5-1 plan

Mark Frichtl sold $838k of OUST

Chief Technology Officer at Ouster, Inc.. 40,000 shares at an average of $20.94, traded Mar 25, 2026, filed Mar 27, 2026.

Warning score
18
Value
$838k
40,000 shares
Holdings after
636,882
-6% from before
From 52-week low
+206%
low $6.61, close $20.22
From 52-week high
-45%
high $37.08, as of Mar 25, 2026

Score components

  • Role
    Officer
    +15
  • Trade size
    $838k at market
    +23
  • Share of holdings sold
    Sold 5.9% of holdings
    0
  • Cluster
    5 insiders selling within 14 days
    +15
  • Exercise and sell
    Shares came from an option exercise in the same filing
    -15
  • 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 +59.8%, 3m +137.9%, 6m +147.6%.

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.

OUSTOct 12, 2026 · close 37.27
Since filing Mar 27, 2026: +111.0%SPY +23.3% · excess +87.7%

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 0001193125-26-129505, as filed. Open on EDGAR

DateTransactionSharesPriceValueHoldings afterFiled
Mar 25, 2026MOption exercise
Common Stock10b5-1
+40,000$2.13$85k676,882Mar 27, 2026
Mar 25, 2026SOpen-market sale
Common Stock10b5-1
-40,000$20.94$838k636,882Mar 27, 2026
Mar 25, 2026MOption exercise
Non-Qualified Stock Optionderivative10b5-1
-40,000$0.00$0276,434Mar 27, 2026

Related signals

Other insiders at Ouster, Inc. and this insider’s other filings.

ScoreCompanyInsiderValueHoldingsFiled
26Weak
OUSTsell 610b5-1
Ouster, Inc.
Megan Chung
General Counsel and Secretary
$390k
11,484 shares
-6%
30Weak
OUSTsell 610b5-1
Ouster, Inc.
Mark Frichtl
Chief Technology Officer
$638k
18,778 shares
-6%
35Weak
OUSTsell 610b5-1
Ouster, Inc.
Kenneth P. Gianella
Chief Financial Officer
$533k
15,686 shares
-6%
44Moderate
OUSTsell 6
Ouster, Inc.
Cyrille Jacquemet
Chief Revenue Officer
$302k
8,896 shares
-8%
45Moderate
OUSTsell 610b5-1
Ouster, Inc.
Charles Angus Pacala
President and CEO
$1.0M
30,385 shares
-3%
32Weak
OUSTsell 610b5-1
Ouster, Inc.
Darien Spencer
Chief Operating Officer
$435k
12,808 shares
-4%
47Moderate
OUSTsell 310b5-1
Ouster, Inc.
Kenneth P. Gianella
Chief Financial Officer
$1.8M
40,000 shares
-13%
23Weak
OUSTsell 310b5-1
Ouster, Inc.
Stephen A Skaggs
director
$228k
5,000 shares
-8%
40Moderate
OUSTsell 310b5-1
Ouster, Inc.
Darien Spencer
Chief Operating Officer
$1.4M
30,000 shares
-9%
19Weak
OUSTsell 710b5-1
Ouster, Inc.
Ted L Tewksbury III
director
$80k
1,695 shares
-1%

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.

Mark Frichtl sold $838k of OUST | InsiderTell