CSS LLC/IL

Position in GOSS — Gossamer Bio, Inc.

CIK 1103646 CHICAGO, IL

Back to GOSS Full portfolio

Position in GOSS

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$4,950

-$4,920 QoQ

Shares Held

30,000

0.0% QoQ

Ownership

0.006%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

#106

of 168 holders

Holding Since

Mar 2020

5 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Common Shares in GOSS Over Time

Shares Held

Position Value (USD)

Derivatives in GOSS

reported options exposure · as of Mar 31, 2026

CallValue

$822

CallShares

2,500

PutValue

PutShares

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 Jun 30, 2026

CSS LLC/IL holds $23,787,576 across 16 Biotechnology names. GOSS ranks #10 (0.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	IONS	Ionis Pharmaceuticals Inc	152,289	$12,074,994
2	JAZZ	Jazz Pharmaceuticals plc	29,041	$6,998,009
3	BMRN	Biomarin Pharmaceutical Inc	22,580	$1,292,027
4	REGN	Regeneron Pharmaceuticals, Inc.	1,820	$1,134,842
5	HALO	Halozyme Therapeutics, Inc.	6,520	$510,320
6	TVTX	Travere Therapeutics, Inc.	8,470	$481,180
7	EXEL	Exelixis, Inc.	8,709	$473,856
8	INCY	Incyte Corp	3,856	$437,116

All Filings in GOSS

Export CSV

9 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$4,950	30,000	0.0%	Shares	Sole	2026-08-14
2026-03-31	$822	2,500	-91.1%	Call	Sole	2026-05-15
2026-03-31	$9,870	30,000	+199.7%	Shares	Sole	2026-05-15
2022-09-30	$337,836	28,200	-2.1%	Call	Sole	2022-11-14
2022-09-30	$47,920	4,000	-86.2%	Put	Sole	2022-11-14
2022-06-30	$241,056	28,800	+5.1%	Call	Sole	2022-08-15
2020-03-31	$293,335	28,900	—	Put	Sole	2020-05-15
2020-03-31	$278,110	27,400	—	Call	Sole	2020-05-15
2020-03-31	$101,601	10,010	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.