Thomas Richard Kassberg - Sep 30, 2021 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: Sep 30, 2021
Transactions value $: $34,018
Form type: 4
Date filed: 10/1/2021, 12:57 PM
Previous filing: May 10, 2021
Next filing: Oct 18, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	RARE	Common Stock	Options Exercise	$34K	+110K	+102.73%	$0.31^*	217K	Sep 30, 2021	Direct	F1

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)	Options Exercise	$0	-110K	-100%	$0.00^*	0	Sep 30, 2021	Common Stock	110K	$0.31	Direct	F2

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

Explanation of Responses:

Id	Content
F1	Includes previously reported shares of common stock underlying RSUs granted to the Reporting Person, which are subject to certain vesting conditions.
F2	The option vested with respect to 1/4th of the shares on the first anniversary of the grant date of the option and 1/48th of the shares thereafter such that the option fully vested on the fourth anniversary of the grant date.