Skip to content
sellWeak cluster of 6

Theodore Alan Huizenga sold $41k of RARE

SVP, Chief Accounting Officer at Ultragenyx Pharmaceutical Inc.. 967 shares at an average of $42.10, traded Mar 3, 2025, filed Mar 4, 2025.

Warning score
36
Value
$41k
967 shares
Holdings after
50,265
-2% from before
From 52-week low
-
no price yet
From 52-week high
-
no price yet

Score components

  • Role
    Officer
    +15
  • Trade size
    $41k at market
    +6
  • Share of holdings sold
    Sold 1.9% of holdings
    0
  • Cluster
    6 insiders selling within 14 days
    +15

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.

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.

RAREOct 9, 2026 · close 15.48
Since filing Mar 4, 2025: -62.3%SPY +37.6% · excess -100.0%

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 0000950170-25-032764, as filed. Open on EDGAR

DateTransactionSharesPriceValueHoldings afterFiled
Mar 1, 2025AGrant or award
Common Stock
+9,392$0.00$051,232Mar 4, 2025
Mar 3, 2025SOpen-market sale
Common Stock
-967$42.10$41k50,265Mar 4, 2025
Mar 3, 2025FTax withholding
Common Stock
-141$42.92$6,05250,124Mar 4, 2025
Mar 1, 2025AGrant or award
Stock Option (Right to Buy)derivative
+5,632$0.00$05,632Mar 4, 2025

Related signals

Other insiders at Ultragenyx Pharmaceutical Inc. and this insider’s other filings.

ScoreCompanyInsiderValueHoldingsFiled
0Weak
RAREsell10b5-1
Ultragenyx Pharmaceutical Inc.
Theodore Alan Huizenga
SVP, Chief Accounting Officer
$17k
1,283 shares
-2%
15Weak
RAREsell
Ultragenyx Pharmaceutical Inc.
Theodore Alan Huizenga
SVP, Chief Accounting Officer
$2,252
161 shares
-0%
20Weak
RAREsell
Ultragenyx Pharmaceutical Inc.
Eric Crombez
EVP and Chief Medical Officer
$29k
762 shares
-1%
45Moderate
RAREsell 6
Ultragenyx Pharmaceutical Inc.
Howard Horn
Chief Financial Officer
$72k
1,785 shares
-2%
51Moderate
RAREsell 6
Ultragenyx Pharmaceutical Inc.
Eric Crombez
EVP and Chief Medical Officer
$377k
8,945 shares
-11%
55Moderate
RAREsell 6
Ultragenyx Pharmaceutical Inc.
Erik Harris
EVP & Chief Commercial Officer
$636k
15,103 shares
-15%
45Moderate
RAREsell 610b5-1
Ultragenyx Pharmaceutical Inc.
Emil D Kakkis
President & CEO
$4.2M
98,434 shares
-5%
43Moderate
RAREsell 6
Ultragenyx Pharmaceutical Inc.
Thomas Richard Kassberg
CBO & EVP
$254k
6,028 shares
-2%
23Weak
RAREsell10b5-1
Ultragenyx Pharmaceutical Inc.
Emil D Kakkis
President & CEO
$495k
11,727 shares
-1%
21Weak
RAREsell10b5-1
Ultragenyx Pharmaceutical Inc.
Emil D Kakkis
President & CEO
$414k
8,273 shares
-0%

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.

Theodore Alan Huizenga sold $41k of RARE | InsiderTell