RARE · Ultragenyx Pharmaceutical Inc.

Track RARE — free

$26.49 +0.11 (+0.42%) At close · Aug 14

Market Cap

$2.61B

98.59M

Options Chain

Underlying $26.49 · at close Aug 14, 2026 Options Calculator

Positioning

Aug 21, 2026 · 4 days to expiry · 40 contracts · mixed snapshot sessions · Feb 20, 2026–Aug 14, 2026; 9 unknown

Put / call OI

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dated and unknown snapshot sessions

Open interest

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dated and unknown snapshot sessions

Volume

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dated and unknown snapshot sessions

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 4d Sep 18 32d Oct 16 60d Nov 20 95d Dec 18 123d Jan 15 151d Feb 19 186d Jan 21 522d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
1	2	—	—	$24.62		—	—	—	—	0
Call · $2.5 In the money Snapshot session Jun 17, 2026 Last $24.62 Breakeven $27.12 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 Model this call Put · $2.5 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	—	—	—		—	—	—	—	0
Call · $5 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $5 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
6	2	—	—	$16.98		$0.40	—	—	1	2
Call · $7.5 In the money Snapshot session Jun 12, 2026 Last $16.98 Breakeven $24.48 Implied vol — Delta — Gamma — Theta — Vega — Open interest 6 Model this call Put · $7.5 Snapshot session Mar 30, 2026 Last $0.40 Breakeven $7.10 Implied vol — Delta — Gamma — Theta — Vega — Open interest 2 Model this put
5	5	—	—	$13.42		$0.05	-0.026	528.2%	1	6
Call · $10 In the money Snapshot session Feb 20, 2026 Last $13.42 Breakeven $23.42 Implied vol — Delta — Gamma — Theta — Vega — Open interest 5 Model this call Put · $10 Snapshot session Aug 11, 2026 Last $0.05 Breakeven $9.95 Implied vol 528.2% Delta -0.026 ≈3% ITM Gamma 0.004 Theta -0.103 Vega 0.002 Open interest 6 Model this put
0	—	—	—	—		$0.10	-0.056	514.1%	3	3
Call · $12.5 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $12.5 Snapshot session May 12, 2026 Last $0.10 Breakeven $12.40 Implied vol 514.1% Delta -0.056 ≈6% ITM Gamma 0.007 Theta -0.187 Vega 0.003 Open interest 3 Model this put
7	1	—	—	$18.20		$0.75	-0.108	544.4%	1	16
Call · $15 In the money Snapshot session Jul 2, 2026 Last $18.20 Breakeven $33.20 Implied vol — Delta — Gamma — Theta — Vega — Open interest 7 Model this call Put · $15 Snapshot session May 18, 2026 Last $0.75 Breakeven $14.25 Implied vol 544.4% Delta -0.108 ≈11% ITM Gamma 0.011 Theta -0.327 Vega 0.006 Open interest 16 Model this put
7	4	—	—	$5.94		$0.25	-0.09	321.8%	10	534
Call · $17.5 In the money Snapshot session Jun 8, 2026 Last $5.94 Breakeven $23.44 Implied vol — Delta — Gamma — Theta — Vega — Open interest 7 Model this call Put · $17.5 Snapshot session Jul 28, 2026 Last $0.25 Breakeven $17.25 Implied vol 321.8% Delta -0.09 ≈9% ITM Gamma 0.017 Theta -0.171 Vega 0.004 Open interest 534 Model this put
8	1	—	—	$13.20		$0.08	-0.132	259.3%	1	300
Call · $20 In the money Snapshot session Jul 1, 2026 Last $13.20 Breakeven $33.20 Implied vol — Delta — Gamma — Theta — Vega — Open interest 8 Model this call Put · $20 Snapshot session Aug 14, 2026 Last $0.08 Breakeven $19.92 Implied vol 259.3% Delta -0.132 ≈13% ITM Gamma 0.028 Theta -0.179 Vega 0.007 Open interest 300 Model this put
17	1	—	—	$4.02		$0.35	-0.135	144.9%	10	808
Call · $22.5 In the money Snapshot session Aug 3, 2026 Last $4.02 Breakeven $26.52 Implied vol — Delta — Gamma — Theta — Vega — Open interest 17 Model this call Put · $22.5 Snapshot session Aug 6, 2026 Last $0.35 Breakeven $22.15 Implied vol 144.9% Delta -0.135 ≈14% ITM Gamma 0.051 Theta -0.102 Vega 0.007 Open interest 808 Model this put
430	5	54.6%	0.845	$2.17		$0.45	-0.273	97.5%	10	84
Call · $25 In the money Snapshot session Aug 13, 2026 Last $2.17 Breakeven $27.17 Implied vol 54.6% Delta 0.845 ≈85% ITM Gamma 0.146 Theta -0.044 Vega 0.008 Open interest 430 Model this call Put · $25 Snapshot session Aug 12, 2026 Last $0.45 Breakeven $24.55 Implied vol 97.5% Delta -0.273 ≈27% ITM Gamma 0.115 Theta -0.104 Vega 0.01 Open interest 84 Model this put
Underlying $26.49
1k	1.1k	80.4%	0.367	$0.95		$1.15	-0.569	125.5%	1	74
Call · $27.5 Snapshot session Aug 14, 2026 Last $0.95 Breakeven $28.45 Implied vol 80.4% Delta 0.367 ≈37% ITM Gamma 0.16 Theta -0.1 Vega 0.011 Open interest 1k Model this call Put · $27.5 In the money Snapshot session Aug 12, 2026 Last $1.15 Breakeven $26.35 Implied vol 125.5% Delta -0.569 ≈57% ITM Gamma 0.106 Theta -0.159 Vega 0.012 Open interest 74 Model this put
2.1k	406	124.1%	0.212	$0.30		$3.80	-0.748	146.2%	1	90
Call · $30 Snapshot session Aug 10, 2026 Last $0.30 Breakeven $30.30 Implied vol 124.1% Delta 0.212 ≈21% ITM Gamma 0.079 Theta -0.117 Vega 0.008 Open interest 2.1k Model this call Put · $30 In the money Snapshot session Aug 14, 2026 Last $3.80 Breakeven $26.20 Implied vol 146.2% Delta -0.748 ≈75% ITM Gamma 0.075 Theta -0.152 Vega 0.008 Open interest 90 Model this put
163	7	170.7%	0.168	$0.45		$8.70	-0.847	163.3%	20	14
Call · $32.5 Snapshot session Aug 10, 2026 Last $0.45 Breakeven $32.95 Implied vol 170.7% Delta 0.168 ≈17% ITM Gamma 0.05 Theta -0.14 Vega 0.009 Open interest 163 Model this call Put · $32.5 In the money Snapshot session Jul 31, 2026 Last $8.70 Breakeven $23.80 Implied vol 163.3% Delta -0.847 ≈85% ITM Gamma 0.049 Theta -0.125 Vega 0.006 Open interest 14 Model this put
990	1	209.1%	0.145	$0.50		$6.30	-0.908	173.8%	8	92
Call · $35 Snapshot session Aug 14, 2026 Last $0.50 Breakeven $35.50 Implied vol 209.1% Delta 0.145 ≈14% ITM Gamma 0.037 Theta -0.155 Vega 0.006 Open interest 990 Model this call Put · $35 In the money Snapshot session Jul 13, 2026 Last $6.30 Breakeven $28.70 Implied vol 173.8% Delta -0.908 ≈91% ITM Gamma 0.032 Theta -0.091 Vega 0.006 Open interest 92 Model this put
146	10	241.5%	0.129	$0.12		$6.60	-0.933	192.1%	3	3
Call · $37.5 Snapshot session Aug 14, 2026 Last $0.12 Breakeven $37.62 Implied vol 241.5% Delta 0.129 ≈13% ITM Gamma 0.029 Theta -0.165 Vega 0.006 Open interest 146 Model this call Put · $37.5 In the money Snapshot session Jul 1, 2026 Last $6.60 Breakeven $30.90 Implied vol 192.1% Delta -0.933 ≈93% ITM Gamma 0.023 Theta -0.078 Vega 0.004 Open interest 3 Model this put
2.5k	3	362.2%	0.212	$0.15		—	-0.915	245.4%	—	0
Call · $40 Snapshot session Aug 6, 2026 Last $0.15 Breakeven $40.15 Implied vol 362.2% Delta 0.212 ≈21% ITM Gamma 0.027 Theta -0.341 Vega 0.01 Open interest 2.5k Model this call Put · $40 In the money Snapshot session Unknown Last — Breakeven — Implied vol 245.4% Delta -0.915 ≈91% ITM Gamma 0.022 Theta -0.123 Vega 0.004 Open interest 0 Model this put
22	17	315.8%	0.127	$0.20		—	-0.944	243.4%	—	0
Call · $42.5 Snapshot session Aug 3, 2026 Last $0.20 Breakeven $42.70 Implied vol 315.8% Delta 0.127 ≈13% ITM Gamma 0.022 Theta -0.212 Vega 0.007 Open interest 22 Model this call Put · $42.5 In the money Snapshot session Unknown Last — Breakeven — Implied vol 243.4% Delta -0.944 ≈94% ITM Gamma 0.016 Theta -0.085 Vega 0.004 Open interest 0 Model this put
44	20	335.1%	0.112	$0.20		—	-0.948	266.9%	—	0
Call · $45 Snapshot session Aug 3, 2026 Last $0.20 Breakeven $45.20 Implied vol 335.1% Delta 0.112 ≈11% ITM Gamma 0.019 Theta -0.207 Vega 0.007 Open interest 44 Model this call Put · $45 In the money Snapshot session Unknown Last — Breakeven — Implied vol 266.9% Delta -0.948 ≈95% ITM Gamma 0.014 Theta -0.089 Vega 0.004 Open interest 0 Model this put
10	8	360.6%	0.106	$0.20		—	-0.951	289.1%	—	0
Call · $47.5 Snapshot session Aug 3, 2026 Last $0.20 Breakeven $47.70 Implied vol 360.6% Delta 0.106 ≈11% ITM Gamma 0.017 Theta -0.216 Vega 0.007 Open interest 10 Model this call Put · $47.5 In the money Snapshot session Unknown Last — Breakeven — Implied vol 289.1% Delta -0.951 ≈95% ITM Gamma 0.012 Theta -0.092 Vega 0.004 Open interest 0 Model this put
72	42	384.9%	0.102	$0.15		—	-0.943	322.4%	—	0
Call · $50 Snapshot session Aug 3, 2026 Last $0.15 Breakeven $50.15 Implied vol 384.9% Delta 0.102 ≈10% ITM Gamma 0.016 Theta -0.225 Vega 0.007 Open interest 72 Model this call Put · $50 In the money Snapshot session Unknown Last — Breakeven — Implied vol 322.4% Delta -0.943 ≈94% ITM Gamma 0.012 Theta -0.116 Vega 0.004 Open interest 0 Model this put

About this data

Each contract's last price, volume, greeks, implied volatility and open interest belongs to the snapshot session shown in its details; unknown means the provider omitted the timestamp. This chain has mixed snapshot sessions · Feb 20, 2026–Aug 14, 2026; 9 unknown. Cross-contract positioning totals are shown only when every returned row has the same known session. Bid and ask are not included on this plan.

In-the-money strikes are tinted, deepening toward the money, and the bar beside each open-interest figure scales to the heaviest strike shown.

Key facts CIK 1515673 CUSIP 90400D108 13F (30d) 325 filings 291 filers Visit website Investor relations