CSS LLC/IL — 13F Holdings & Portfolio

CIK 1103646 · latest 13F-HR filed 2026-08-14

CSS LLC/IL manages $2.57B in 13F-reported U.S. long-equity assets across 1,001 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are LITE (9.56%), HPEPC (5.81%), ECHO (5.35%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 211 new positions and exited 184; 258 existing positions rose in reported value and 182 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

AUM

$2.57B

Long-equity book

Holdings

1,001

Distinct positions

Period

2026-06-30

Filed 2026-08-14

Q/Q Activity

+211 / −184 / ↑258 / ↓182

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26

LITE10.9% · -7%HPEPC6.6% · +1015%ECHO6.1% · +7%APO3.7% · new BACPL2.8% · +388%WOLF2.4% · +49%SMCIP2.0% · new CORZW2.0% · +13%MCHPP1.9% · new NET1.5% · +95%AKAM1.3% · +58%ALBPA1.2% · +88%CNP1.1% · 0%EQX1.1% · +88%BAPA1.0% · newTRANSOCEAN INC1.0% · -38%EPPC1.0% · +97%RSP1.0% · +1%VOO1.0% · 0%IREN0.9% · new GH0.9% · +72%MARA0.9% · -34%DOCN0.9% · new PTC0.8% · +316%SNOW0.7% · -36%WDC0.7% · -2%GME0.7% · new IAU0.7% · 0%KIMPN0.7% · 0%GOOGN0.6% · new SPY0.6% · new PEN0.5% · +7%BBIO0.5% · -28%IONS0.5% · +92%CELC0.5% · -16%HAE0.5% · +9326%BKD0.5% · 0%ALNY0.5% · -51%TMDX0.5% · new ON0.5% · +19489%OHAC0.5% · new PPL0.5% · +201%FTRA.U0.4% · new GTLS0.4% · +328%BYND0.4% · -18%JHG0.4% · +1012%SPEPC0.4% · +5%LYFT0.4% · +18%GPRE0.4% · 0%STEW0.4% · 0%NEEPV0.4% · -68%USFD0.3% · new TACH0.3% · 0%PEABODY ENGR0.3% · -75%JAZZ0.3% · new EVAC0.3% · +466%WENN0.3% · 0%RVMDW0.3% · +348%GOOGM0.3% · new DBMF0.3% · 0%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 39.9%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

Name	Title / Status	Ownership	Type

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

Top Adds (vs prior quarter)

HEWLETT PACKARD ENTERPRISE C$141.9M +1902.6%
APOLLO GLOBAL MGMT INC$66.5M +408.4%
BANK OF AMER CORP$51.0M +413.5%
WOLFSPEED INC$40.7M +301.2%
LUMENTUM HLDGS INC$29.1M +13.4%

Show all 258 →

Top Trims

PEABODY ENGR CORP-$30.8M -81.5%
TRANSOCEAN INC-$26.0M -52.5%
NEXTERA ENERGY INC-$19.0M -69.7%
ALNYLAM PHARMACEUTICALS INC-$13.0M -54.3%
CHEESECAKE FACTORY INC-$9.6M -71.6%

Show all 182 →

New Positions

Show all 211 →

Exited Positions

JAZZ INVESTMENTS I LTD$63.9M
LIVE NATION ENTERTAINMENT IN$49.9M
STRIDE INC$17.8M
CSG SYS INTL INC$9.1M
HOLOGIC INC$8.9M

Show all 184 →

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#	Issuer	Symbol	CUSIP	Value	Δ

CSS LLC/IL Holdings (2026-06-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

#	Issuer	Symbol	CUSIP	Value	Weight	Shares	Type
1	LUMENTUM HLDGS INC	LITE	55024UAF6	$245.6M	9.56%	37,554,000	PRN
2	HEWLETT PACKARD ENTERPRISE C	HPEPC	42824C208	$149.3M	5.81%	1,276,322	SH
3	ECHOSTAR CORP	ECHO	278768AB2	$137.4M	5.35%	43,925,753	PRN
4	APOLLO GLOBAL MGMT INC	APO	03769M304	$82.8M	3.22%	1,361,499	SH
5	BANK OF AMER CORP	BACPL	060505682	$63.3M	2.46%	50,372	SH
6	WOLFSPEED INC	WOLF	977852AP7	$54.2M	2.11%	13,773,940	PRN
7	SUPER MICRO COMPUTER INC	SMCIP	86800U500	$45.3M	1.76%	878,227	SH
8	CORE SCIENTIFIC INC NEW	CORZW	21874A114	$44.2M	1.72%	2,351,492	SH
9	MICROCHIP TECHNOLOGY INC.	MCHPP	595017302	$43.0M	1.67%	558,552	SH
10	CLOUDFLARE INC	NET	18915MAC1	$33.5M	1.31%	26,112,000	PRN
11	AKAMAI TECHNOLOGIES INC	AKAM	00971TAN1	$29.6M	1.15%	24,797,000	PRN
12	GAMESTOP CORP Put	GME	36467W109	$27.2M	1.06%	1,230,200	SH
13	ALBEMARLE CORP	ALBPA	012653200	$26.1M	1.02%	470,583	SH
14	CENTERPOINT ENERGY INC	CNP	15189TBD8	$25.3M	0.98%	21,000,000	PRN
15	EQUINOX GOLD CORP	EQX	29446YAC0	$25.1M	0.98%	14,895,000	PRN
16	BOEING CO	BAPA	097023204	$23.6M	0.92%	349,354	SH
17	TRANSOCEAN INC	—	893830BW8	$23.5M	0.91%	15,168,000	PRN
18	EL PASO ENERGY CAP TR I	EPPC	283678209	$22.6M	0.88%	446,461	SH
19	INVESCO EXCHANGE TRADED FD T	RSP	46137V357	$22.1M	0.86%	104,072	SH
20	VANGUARD INDEX FDS	VOO	922908363	$22.1M	0.86%	32,210	SH
21	KINDER MORGAN INC DEL Put	KMI	49456B101	$21.7M	0.85%	678,900	SH
22	IREN LIMITED	IREN	46270CAD1	$21.2M	0.83%	6,000,000	PRN
23	DIGITALOCEAN HLDGS INC	DOCN	25402DAB8	$19.5M	0.76%	17,243,000	PRN
24	PTC THERAPEUTICS INC	—	69366JAD3	$18.6M	0.73%	12,002,000	PRN
25	SNOWFLAKE INC	SNOW	833445AD1	$16.5M	0.64%	9,300,000	PRN
26	XEROX HOLDINGS CORP Put	—	98421M956	$16.0M	0.62%	5,100,000	SH
27	WESTERN DIGITAL CORP	WDC	958102105	$15.9M	0.62%	24,933	SH
28	GAMESTOP CORP	GME	36467WAG4	$15.2M	0.59%	14,944,000	PRN
29	ISHARES GOLD TR	IAU	464285204	$15.1M	0.59%	200,040	SH
30	KIMCO REALTY CORP	KIMPN	49446R687	$15.0M	0.58%	237,147	SH
31	STATE STR SPDR S&P 500 ETF T Call	SPY	78462F103	$14.2M	0.55%	19,000	SH
32	ALPHABET INC	GOOGN	02079K602	$13.4M	0.52%	266,589	SH
33	STATE STR SPDR S&P 500 ETF T	SPY	78462F103	$12.9M	0.50%	17,269	SH
34	PENUMBRA INC	PEN	70975L107	$12.2M	0.48%	38,740	SH
35	IONIS PHARMACEUTICALS INC	IONS	462222100	$12.1M	0.47%	152,289	SH
36	BRIDGEBIO PHARMA INC	BBIO	10806XAJ1	$12.1M	0.47%	7,175,000	PRN
37	CELCUITY INC	CELC	15102KAA8	$11.9M	0.46%	5,310,000	PRN
38	HAEMONETICS CORP MASS	HAE	405024AD2	$11.6M	0.45%	11,500,000	PRN
39	PENUMBRA INC Put	PEN	70975L107	$11.4M	0.44%	36,100	SH
40	GUARDANT HEALTH INC	GH	40131MAD1	$11.3M	0.44%	4,514,000	PRN
41	MARA HOLDINGS INC	MARA	565788AD8	$11.1M	0.43%	10,000,000	PRN
42	BROOKDALE SR LIVING INC	BKD	112463AC8	$11.0M	0.43%	5,632,000	PRN
43	ALNYLAM PHARMACEUTICALS INC	ALNY	02043QAB3	$10.9M	0.42%	9,063,000	PRN
44	TRANSMEDICS GROUP INC	TMDX	89377MAB5	$10.9M	0.42%	10,000,000	PRN
45	ON SEMICONDUCTOR CORP	ON	682189AU9	$10.4M	0.40%	8,619,000	PRN
46	OCEANHAWK ACQUISITION CORP	OHAC	G6722R107	$10.3M	0.40%	1,038,610	SH
47	PPL CAP FDG INC	PPLC	69352PAS2	$10.2M	0.40%	8,988,000	PRN
48	FUTURECORP SPACE ACQUISITION	FTRA.U	G37307124	$10.1M	0.39%	1,000,000	SH
49	ELECTRONIC ARTS INC Put	EA	285512109	$9.8M	0.38%	47,800	SH
50	MARA HOLDINGS INC	MARA	565788AF3	$9.5M	0.37%	9,467,000	PRN

Filing History

Period	Filed	AUM	Holdings	Accession
2026-06-30	2026-08-14	$2.57B	1,001	0001103646-26-000012
2026-03-31	2026-05-15	$2.09B	961	0001103646-26-000009
2025-12-31	2026-02-17	$2.25B	999	0001103646-26-000003
2025-09-30	2025-11-13	$2.23B	985	0001103646-25-000009

Filer Information

Address

1 NORTH WACKER DRIVE
SUITE 3075
CHICAGO, IL 60606

Phone

(312) 542-8515

Filing Manager

CSS LLC/IL

CHICAGO, IL

Signatory

Mitchel Bialek

CCO