Ultragenyx Pharmaceutical Inc.
A biopharmaceutical company that develops and sells treatments for rare and ultra-rare genetic diseases, many of which had no approved therapy before. Its marketed medicines include CRYSVITA for a bone disorder called X-linked hypophosphatemia and MEPSEVII for a lysosomal storage disease. Founded in 2010 by pediatric geneticist Emil Kakkis, the company's name blends "ultra" (for ultra-rare diseases) with "genyx" (for genetics), and it trades on the stock market under the ticker symbol RARE.
Granted 387.9K · Sold 320.7K
Granted 77.1K · Sold 58.4K
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Granted 85.9K · Sold 28.6K
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Granted 156.2K · Sold 50.5K
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Granted 18.8K · Sold 12.2K
Granted 18.8K
Granted 18.8K · Sold 5.7K
Granted 18.8K · Sold 6.7K
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Kakkis Emil DPresident & CEO, Director · 19 transactions | — | 4.85M | 387.9K | — | 320.7K |
| Kassberg Thomas RichardCBO & EVP · 10 transactions | +5.2% | 265.2Kas of Mar 2025 | 77.1K | — | 58.4K |
| Huang Dennis KarlSee Remarks · 9 transactions | +175.3% | 147.8K | 85.9K | — | — |
| Pinion John RichardSee Remarks · 11 transactions | +78.1% | 133.1K | 85.9K | — | 28.6K |
| Harris ErikEVP & Chief Commercial Officer · 10 transactions | +106.7% | 118.4K | 96.2K | — | 36.4K |
| Crombez EricEVP and Chief Medical Officer · 13 transactions | +330.1% | 111.2K | 97.5K | — | 18.8K |
| Horn HowardChief Financial Officer · 17 transactions | — | 105.7K | 156.2K | — | 50.5K |
| Parschauer Karah HerdmanEVP and Chief Legal Officer · 16 transactions | +81.7% | 94.5K | 91.7K | — | 51.4K |
| Huizenga Theodore AlanSVP, Chief Accounting Officer · 23 transactions | +124.1% | 68.9K | 50.3K | — | 6.4K |
| Narachi MichaelDirector · 3 transactions | +468.8% | 40.4K | 18.8K | — | — |
| Welch Daniel GDirector · 3 transactions | +87.2% | 40.4K | 18.8K | — | — |
| Dunsire DeborahDirector · 3 transactions | +95.5% | 38.6K | 18.8K | — | — |
| Fust Matthew KDirector · 6 transactions | +11% | 33.7K | 18.8K | — | 12.2K |
| Ray AmritDirector · 3 transactions | +153.4% | 31.1K | 18.8K | — | — |
| Suliman ShehnaazDirector · 4 transactions | +88.2% | 28.0K | 18.8K | — | 5.7K |
| Sanders Corazon (Corsee) D.Director · 7 transactions | +134.8% | 21.1K | 18.8K | — | 6.7K |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over the last 3 years: -596.0K shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.