Caption Management, LLC

Position in RARE — Ultragenyx Pharmaceutical Inc.

CIK 1706766 OKLAHOMA CITY, OK

Back to RARE Full portfolio

Position in RARE

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$2,304,500

-$2,744,000 QoQ

Shares Held

110,000

-49.9% QoQ

Ownership

0.112%

of shares outstanding

% of Portfolio

0.12%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Jun 2020

20 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Common Shares in RARE Over Time

Shares Held

Position Value (USD)

Derivatives in RARE

reported options exposure · as of Mar 31, 2026

CallValue

$7,123,000

CallShares

340,000

PutValue

$6,075,500

PutShares

290,000

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Biotechnology

Healthcare · as of Mar 31, 2026

Caption Management, LLC holds $195,300,170 across 69 Biotechnology names. RARE ranks #22 (1.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	CGON	CG Oncology, Inc.	378,480	$25,615,526
2	IMCR	Immunocore Holdings plc	661,786	$19,952,847
3	CYTK	Cytokinetics Inc	245,000	$16,147,950
4	ELVN	Enliven Therapeutics, Inc.	370,000	$14,504,000
5	SLNO	Soleno Therapeutics Inc	420,143	$14,066,387
6	CNTA	Centessa Pharmaceuticals plc	274,116	$10,887,887
7	CORT	Corcept Therapeutics Inc	260,000	$10,480,600
8	HRMY	Harmony Biosciences Holdings, Inc.	272,292	$7,626,898

All Filings in RARE

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50 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$6,075,500	290,000	-14.7%	Put	Sole	2026-05-15
2026-03-31	$7,123,000	340,000	+209.1%	Call	Sole	2026-05-15
2026-03-31	$2,304,500	110,000	-55.9%	Shares	Sole	2026-05-15
2025-12-31	$5,740,800	249,600	-38.3%	Call	Sole	2026-02-17
2025-12-31	$9,308,100	404,700	+84.4%	Put	Sole	2026-02-17
2025-12-31	$5,048,500	219,500	-59.2%	Shares	Sole	2026-02-17
2025-09-30	$16,168,000	537,500	+226.7%	Call	Sole	2025-11-14
2025-09-30	$4,948,190	164,501	+9.8%	Shares	Sole	2025-11-14
2025-09-30	$4,505,984	149,800	-84.7%	Put	Sole	2025-11-14
2025-06-30	$35,505,540	976,500	+311.2%	Call	Sole	2025-08-14
2025-06-30	$8,635,500	237,500	-51.9%	Shares	Sole	2025-08-14
2025-06-30	$17,943,660	493,500	+1545.0%	Put	Sole	2025-08-14
2025-03-31	$1,086,300	30,000	-83.2%	Call	Sole	2025-05-15
2025-03-31	$6,475,361	178,828	-39.8%	Shares	Sole	2025-05-15
2025-03-31	$10,754,370	297,000	+152.6%	Put	Sole	2025-05-15
2024-12-31	$4,946,211	117,571	+235.9%	Shares	Sole	2025-02-14
2024-12-31	$1,472,450	35,000	-82.7%	Call	Sole	2025-02-14
2024-12-31	$8,519,175	202,500	+2254.7%	Put	Sole	2025-02-14
2024-09-30	$477,730	8,600	-71.3%	Shares	Sole	2024-11-14
2024-09-30	$1,666,500	30,000	0.0%	Call	Sole	2024-11-14
2024-09-30	$1,666,500	30,000	+27.1%	Put	Sole	2024-11-14
2024-03-31	$1,101,884	23,600	0.0%	Call	Sole	2024-05-15
2024-03-31	$1,101,884	23,600	-21.3%	Put	Sole	2024-05-15
2023-12-31	$1,434,600	30,000	0.0%	Call	Sole	2024-02-14
2023-12-31	$1,434,600	30,000	+33.3%	Put	Sole	2024-02-14
2023-09-30	$802,125	22,500	0.0%	Call	Sole	2023-11-14
2023-09-30	$802,125	22,500	-75.0%	Put	Sole	2023-11-14
2023-06-30	$4,151,700	90,000	0.0%	Call	Sole	2023-08-14
2023-06-30	$4,151,700	90,000	+399.3%	Put	Sole	2023-08-14
2023-03-31	$722,762	18,024	-39.9%	Shares	Sole	2023-05-15
2023-03-31	$1,203,000	30,000	0.0%	Call	Sole	2023-05-15
2023-03-31	$1,203,000	30,000	+445.5%	Put	Sole	2023-05-15
2022-12-31	$254,815	5,500	-72.5%	Shares	Sole	2023-02-14
2022-12-31	$926,600	20,000	0.0%	Call	Sole	2023-02-14
2022-12-31	$926,600	20,000	-61.4%	Put	Sole	2023-02-14
2022-09-30	$2,145,038	51,800	-57.9%	Shares	Sole	2022-11-14
2022-09-30	$5,089,289	122,900	+49.2%	Call	Sole	2022-11-14
2022-09-30	$3,412,184	82,400	-49.4%	Put	Sole	2022-11-14
2022-06-30	$9,718,614	162,900	+0.2%	Call	Sole	2022-08-15
2022-06-30	$9,700,716	162,600	+478135.3%	Put	Sole	2022-08-15
2022-06-30	$2,028	34	-99.9%	Shares	Sole	2022-08-15
2022-03-31	$4,204,698	57,900	+72.8%	Call	Sole	2022-05-13
2022-03-31	$2,432,770	33,500	+210.2%	Put	Sole	2022-05-13
2021-03-31	$1,229,801	10,801	-56.8%	Shares	Sole	2021-05-17
2021-03-31	$2,846,500	25,000	-43.7%	Put	Sole	2021-05-17
2021-03-31	$5,055,384	44,400	+62.0%	Call	Sole	2021-05-17
2020-12-31	$3,792,982	27,400	+1.5%	Call	Sole	2021-02-16
2020-09-30	$2,219,130	27,000	0.0%	Call	Sole	2020-11-16
2020-09-30	$2,219,130	27,000	-52.2%	Put	Sole	2020-11-16
2020-06-30	$4,419,430	56,500	—	Put	Sole	2020-08-14
No filing history on record for this holder in this stock.