Huizenga Theodore Alan, SVP and Chief Accounting Officer of Ultragenyx Pharmaceutical Inc. ($RARE), made four open market sales of company shares over the last year, totaling $44,636. His most recent sale occurred on March 2, 2026. These transactions rank 10,506th among 11,678 insiders in the database by sale value, well below the average of $8.6 million across 6.4 transactions per insider. He reported no open market purchases.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 2, 2026 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | F | Common Stock | 148 | $23.39 | 50,302.0000 | 98,600,000 | 0.29% | 0.00% |
| March 2, 2026 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | S | Common Stock | 1632 | $22.80 | 48,670.0000 | 98,600,000 | 3.24% | 0.00% |
| Dec. 29, 2025 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | S | Common Stock | 85 | $34.38 | 50,450.0000 | 99,771,297 | 0.17% | 0.00% |
| Sept. 18, 2025 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | S | Common Stock | 64 | $29.17 | 50,242.0000 | 90,538,118 | 0.13% | 0.00% |
| Sept. 5, 2025 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | S | Common Stock | 84 | $31.39 | 50,306.0000 | 90,538,118 | 0.17% | 0.00% |
| March 1, 2025 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | A | Common Stock | 9392 | $0.00 | 51,232.0000 | 90,538,118 | 22.45% | 0.01% |
| March 3, 2025 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | S | Common Stock | 967 | $42.10 | 50,265.0000 | 90,538,118 | 1.89% | 0.00% |
| March 3, 2025 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | F | Common Stock | 141 | $42.92 | 50,124.0000 | 90,538,118 | 0.28% | 0.00% |
| March 1, 2025 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | A | Stock Option (Right to Buy) | 5632 | $0.00 | 5,632.0000 | 90,538,118 | 9999.99% | 0.01% |
| Dec. 10, 2024 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | G | Common Stock | 648 | $0.00 | 41,840.0000 | 95,493,996 | 1.53% | 0.00% |
| Sept. 16, 2024 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | A | Common Stock | 700 | $0.00 | 42,251.0000 | 73,543,862 | 1.68% | 0.00% |
| Sept. 3, 2024 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | S | Common Stock | 91 | $56.19 | 41,551.0000 | 73,543,862 | 0.22% | 0.00% |
| April 16, 2024 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | F | Common Stock | 14 | $42.31 | 41,366.0000 | 73,543,862 | 0.03% | 0.00% |
| March 1, 2024 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | A | Common Stock | 13950 | $0.00 | 41,842.0000 | 73,543,862 | 50.01% | 0.02% |
| March 1, 2024 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | F | Common Stock | 121 | $53.69 | 41,721.0000 | 73,543,862 | 0.29% | 0.00% |
| March 1, 2024 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | S | Common Stock | 341 | $53.76 | 41,380.0000 | 73,543,862 | 0.82% | 0.00% |
| March 1, 2024 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | A | Stock Option (Right to Buy) | 8200 | $0.00 | 8,200.0000 | 73,543,862 | 9999.99% | 0.01% |
| March 1, 2024 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | A | Stock Option (Right to Buy) | 2351 | $0.00 | 2,351.0000 | 73,543,862 | 9999.99% | 0.00% |
| Jan. 2, 2024 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | M | Stock Option (Right to Buy) | 3000 | $0.00 | 0.0000 | 73,543,862 | 100.00% | 0.00% |
| Dec. 20, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | A | Common Stock | 1000 | $0.00 | 24,614.0000 | 69,914,225 | 4.23% | 0.00% |
| Jan. 2, 2024 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | M | Common Stock | 3000 | $21.00 | 27,892.0000 | 73,543,862 | 12.05% | 0.00% |
| Sept. 27, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | A | Stock Option (Right to Buy) | 2351 | $0.00 | 2,351.0000 | 69,914,225 | 9999.99% | 0.00% |
| Sept. 7, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | M | Stock Option (Right to Buy) | 2000 | $0.00 | 3,000.0000 | 69,914,225 | 40.00% | 0.00% |
| Sept. 7, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | S | Common Stock | 163 | $38.34 | 23,614.0000 | 69,914,225 | 0.69% | 0.00% |
| Sept. 7, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | S | Common Stock | 2000 | $41.00 | 23,777.0000 | 69,914,225 | 7.76% | 0.00% |
| Sept. 7, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | M | Common Stock | 2000 | $21.00 | 25,777.0000 | 69,914,225 | 8.41% | 0.00% |
| Sept. 1, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | S | Common Stock | 883 | $37.04 | 23,864.0000 | 69,914,225 | 3.57% | 0.00% |
| Sept. 1, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | S | Common Stock | 87 | $38.23 | 23,777.0000 | 69,914,225 | 0.36% | 0.00% |
| May 9, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | M | Stock Option (Right to Buy) | 3000 | $0.00 | 5,000.0000 | 69,914,225 | 37.50% | 0.00% |
| May 9, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | M | Common Stock | 3000 | $21.00 | 30,747.0000 | 69,914,225 | 10.81% | 0.00% |
| April 16, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | D | Common Stock | 181 | $38.20 | 27,520.0000 | 69,914,225 | 0.65% | 0.00% |
| April 16, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | F | Common Stock | 14 | $38.20 | 27,701.0000 | 69,914,225 | 0.05% | 0.00% |
| March 1, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | A | Common Stock | 7590 | $0.00 | 23,148.0000 | 69,914,225 | 48.79% | 0.01% |
| March 1, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | D | Common Stock | 1333 | $45.65 | 21,715.0000 | 69,914,225 | 5.78% | 0.00% |
| March 1, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | A | Stock Option (Right to Buy) | 10120 | $0.00 | 10,120.0000 | 69,914,225 | 9999.99% | 0.01% |
| March 1, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | S | Common Stock | 100 | $45.65 | 23,048.0000 | 69,914,225 | 0.43% | 0.00% |
| Feb. 28, 2023 | Ultragenyx Pharmaceutical Inc. | $RARE | Huizenga Theodore Alan | SVP, Chief Accounting Officer | S | Common Stock | 639 | $43.40 | 15,558.0000 | 69,914,225 | 3.95% | 0.00% |