Insider · CIK 0001603347
Theodore Alan Huizenga
Files at RARE (Ultragenyx Pharmaceutical Inc.). First filing Mar 4, 2025, latest Sep 15, 2026.
Theodore Alan Huizenga files SEC Form 4 as officer at RARE (Ultragenyx Pharmaceutical Inc.). Since Mar 4, 2025, Theodore Alan Huizenga has reported 0 open-market buys worth $0 and 7 open-market sells worth $105k, the latest filed on Sep 15, 2026.
A track record needs three past buys with six months of prices behind them; Theodore Alan Huizenga has 0, so none is measured yet.
The newest scored trade: sold $17k of RARE on Sep 15, 2026, filed Sep 15, 2026, scored 0 (weak), under a 10b5-1 plan. In the last 12 months: 0 buys worth $0 and 4 sells worth $60k.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
RARE: Ultragenyx Pharmaceutical Inc.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 0Weak | Ultragenyx Pharmaceutical Inc. | $17k 1,283 shares | -2% | - | |
| 15Weak | RAREsell Ultragenyx Pharmaceutical Inc. | $2,252 161 shares | -0% | - | |
| 36Weak | Ultragenyx Pharmaceutical Inc. | $37k 1,632 shares | -3% | +17% from low-44% from high | |
| 23Weak | Ultragenyx Pharmaceutical Inc. | $2,922 85 shares | -0% | 0% from low-57% from high | |
| 23Weak | Ultragenyx Pharmaceutical Inc. | $1,867 64 shares | -0% | +11% from low-50% from high | |
| 23Weak | Ultragenyx Pharmaceutical Inc. | $2,637 84 shares | -0% | +21% from low-46% from high | |
| 36Weak | Ultragenyx Pharmaceutical Inc. | $41k 967 shares | -2% | - |
Transactions
Every row this insider has filed, 14 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 15, 2026 | RARE Ultragenyx Pharmaceutical Inc. | SOpen-market sale Common Stock10b5-1 | -1,283 | $13.57 | $17k | 67,863 | 28 d ago |
| Sep 3, 2026 | RARE Ultragenyx Pharmaceutical Inc. | SOpen-market sale Common Stock | -161 | $13.99 | $2,252 | 69,146 | 35 d ago |
| Apr 22, 2026 | RARE Ultragenyx Pharmaceutical Inc. | AGrant or award Common Stock | +20,241 | $0.00 | $0 | 68,911 | Apr 24, 2026 |
| Apr 22, 2026 | RARE Ultragenyx Pharmaceutical Inc. | AGrant or award Stock Option (Right to Buy)derivative | +7,348 | $0.00 | $0 | 7,348 | Apr 24, 2026 |
| Mar 2, 2026 | RARE Ultragenyx Pharmaceutical Inc. | FTax withholding Common Stock | -148 | $23.39 | $3,462 | 50,302 | Mar 3, 2026 |
| Mar 2, 2026 | RARE Ultragenyx Pharmaceutical Inc. | SOpen-market sale Common Stock | -1,632 | $22.80 | $37k | 48,670 | Mar 3, 2026 |
| Dec 29, 2025 | RARE Ultragenyx Pharmaceutical Inc. | SOpen-market sale Common Stock | -85 | $34.38 | $2,922 | 50,450 | Dec 30, 2025 |
| Sep 18, 2025 | RARE Ultragenyx Pharmaceutical Inc. | SOpen-market sale Common Stock | -64 | $29.17 | $1,867 | 50,242 | Sep 19, 2025 |
| Sep 5, 2025 | RARE Ultragenyx Pharmaceutical Inc. | SOpen-market sale Common Stock | -84 | $31.39 | $2,637 | 50,306 | Sep 8, 2025 |
| Mar 1, 2025 | RARE Ultragenyx Pharmaceutical Inc. | AGrant or award Common Stock | +9,392 | $0.00 | $0 | 51,232 | Mar 4, 2025 |
| Mar 3, 2025 | RARE Ultragenyx Pharmaceutical Inc. | SOpen-market sale Common Stock | -967 | $42.10 | $41k | 50,265 | Mar 4, 2025 |
| Mar 3, 2025 | RARE Ultragenyx Pharmaceutical Inc. | FTax withholding Common Stock | -141 | $42.92 | $6,052 | 50,124 | Mar 4, 2025 |
| Mar 1, 2025 | RARE Ultragenyx Pharmaceutical Inc. | AGrant or award Stock Option (Right to Buy)derivative | +5,632 | $0.00 | $0 | 5,632 | Mar 4, 2025 |
| Dec 10, 2024 | RARE Ultragenyx Pharmaceutical Inc. | GGift Common Stock | -648 | $0.00 | $0 | 41,840 | Dec 11, 2024 |
Questions about Theodore Alan Huizenga
Answered from the filings on this page, as of the latest one.
Is Theodore Alan Huizenga buying or selling?
In the last 12 months Theodore Alan Huizenga reported 0 open-market buys worth $0 and 4 open-market sells worth $60k on SEC Form 4; the latest was sold $17k of RARE on Sep 15, 2026. Grants, option exercises and tax withholding are not counted.
How did Theodore Alan Huizenga's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Theodore Alan Huizenga has 0.
Where does Theodore Alan Huizenga file Form 4?
Theodore Alan Huizenga has filed Form 4 at RARE (Ultragenyx Pharmaceutical Inc.) as SVP, Chief Accounting Officer. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
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.