Thomas Richard Kassberg - Mar 1, 2022 Form 4 Insider Report for Ultragenyx Pharmaceutical Inc. (RARE)

Role: CBO & EVP
Signature: /s/ Karah Parschauer, attorney-in-fact
Stock symbol: RARE
Transactions as of: Mar 1, 2022
Transactions value $: -$158,156
Form type: 4
Date filed: 3/3/2022, 05:07 PM
Previous filing: Feb 1, 2022
Next filing: Mar 15, 2022

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	RARE	Common Stock	Sale	-$158K	-2.37K	-1.1%	$66.62	214K	Mar 1, 2022	Direct	F1
transaction	RARE	Common Stock	Award	$0	+14K	+6.55%	$0.00	228K	Mar 1, 2022	Direct	F2, F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	RARE	Stock Option (Right to Buy)	Award	$0	+24.9K		$0.00	24.9K	Mar 1, 2022	Common Stock	24.9K	$67.37	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents shares sold to pay required tax withholdings due to the vesting of Restricted Stock Units ("RSUs").
F2	Award of RSUs under the Company's 2014 Incentive Plan. The RSUs shall vest with respect to 1/4th of the underlying shares on each anniversary of the grant date, such that the RSUs are fully vested on the fourth anniversary of the grant date.
F3	Includes previously reported shares of common stock underlying RSUs granted to the Reporting Person, which are subject to certain vesting conditions.
F4	On the first anniversary of the grant date of the option (the "Option Anniversary Date"), 1/4th of the shares initially subject to the option shall vest; thereafter, 1/48th of the shares initially subject to the option shall vest on each month as measured from the Option Anniversary Date.