Theodore Alan Huizenga is VP & Controller at Ultragenyx Pharmaceutical Inc. (RARE). They have made 32 open-market trades across 1 company since 2015, most recently 2026-09-15.
CIK 0001603347
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 32 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| RARE | 67,863 | $987K |
Shares reported on the most recent Form 4, priced at the 2026-09-15 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| RARE | SELL | 2026-09-15 | 2026-09-15 | $13.57 | $17K | +10.2% | +15.3% | — |
| RARE | SELL | 2026-09-03 | 2026-09-08 | $13.99 | $2K | -3.0% | +2.1% | — |
| RARE | SELL | 2026-03-02 | 2026-03-03 | $22.80 | $37K | -3.3% | +1.7% | +3.6% |
| RARE | SELL | 2025-12-29 | 2025-12-30 | $34.38 | $3K | +8.3% | +7.9% | -14.2% |
| RARE | SELL | 2025-09-18 | 2025-09-19 | $29.17 | $2K | +6.3% | +21.9% | +16.4% |
| RARE | SELL | 2025-09-05 | 2025-09-08 | $31.39 | $3K | -7.7% | -2.1% | +15.6% |
| RARE | SELL | 2025-03-03 | 2025-03-04 | $42.10 | $41K | -4.0% | -14.3% | -11.9% |
| RARE | SELL | 2024-09-03 | 2024-09-05 | $56.19 | $5K | +3.4% | -7.3% | -16.7% |
| RARE | SELL | 2024-03-01 | 2024-03-05 | $53.76 | $18K | -7.9% | -8.4% | -20.0% |
| RARE | SELL | 2023-09-07 | 2023-09-11 | $40.80 | $88K | -9.9% | -10.8% | -0.0% |
| RARE | SELL · 10b5-1 | 2023-09-01 | 2023-09-06 | $37.15 | $36K | -5.3% | -8.1% | +9.6% |
| RARE | SELL | 2023-03-01 | 2023-03-03 | $45.65 | $5K | -10.2% | -10.8% | +9.3% |
| RARE | SELL · 10b5-1 | 2023-02-28 | 2023-03-02 | $43.40 | $28K | -4.3% | -4.5% | +16.5% |
| RARE | SELL | 2022-12-21 | 2022-12-22 | $43.96 | $179K | +6.0% | -3.9% | -16.3% |
| RARE | SELL | 2022-04-16 | 2022-04-19 | $84.55 | $11K | -10.1% | -40.3% | -22.4% |
| RARE | SELL | 2022-03-01 | 2022-03-03 | $66.62 | $112K | +1.0% | +23.9% | -26.8% |
| RARE | SELL | 2021-10-14 | 2021-10-18 | $81.14 | $11K | +8.5% | -0.8% | -13.4% |
| RARE | SELL | 2021-05-06 | 2021-05-10 | $113.67 | $16K | +7.5% | -9.3% | -13.5% |
| RARE | SELL | 2021-03-08 | 2021-03-09 | $120.69 | $362K | -2.3% | -16.5% | -25.2% |
| RARE | SELL | 2021-03-01 | 2021-03-03 | $138.17 | $202K | +3.2% | -9.5% | -20.3% |
| RARE | SELL | 2021-01-07 | 2021-01-08 | $140.65 | $563K | -11.8% | +10.0% | -29.4% |
| RARE | SELL | 2020-10-14 | 2020-10-16 | $87.98 | $13K | +2.6% | +28.2% | +51.1% |
| RARE | SELL | 2020-07-08 | 2020-07-10 | $91.00 | $240K | -4.8% | -2.3% | +8.3% |
| RARE | SELL | 2020-07-01 | 2020-07-06 | $81.00 | $211K | -2.5% | -4.3% | +2.4% |
| RARE | SELL · 10b5-1 | 2020-05-26 | 2020-05-27 | $74.93 | $19K | -1.6% | +6.6% | +21.2% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.