2026 Q1 Portfolio Activity
In 2026 Q1, CSS LLC/IL maintained a portfolio of 1297 distinct positions. The most significant new addition was PENUMBRA INC, now representing 0.59% of the total fund value. They heavily accumulated shares in LUMENTUM HLDGS INC, increasing the position by 381635.8%. Conversely, CSS LLC/IL completely exited their position in ECHOSTAR CORP.
Position History
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Total Positions
1297
Quarter
2026 Q1
Top Holding
N/A (10.4%)
Top 10 Concentration
32.0%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-50 of 1297
CSS LLC/IL Full Holdings List — 2026 Q1
| Stock | History | Sector / Type | Port % | Prev % | Rank / Prev | Conviction | Change | % Change | Influence | Shares | Mkt Value | Avg Cost | Price Held | 1st Owned | Source | Source Date | Date Reported | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
N/A
LUMENTUM HLDGS ...
|
|
Bond/Debt | 10.37% | 5.11% |
#1
1
Prev: #2
|
7.0 |
—
|
no change | no change |
P
S
|
40,464,000 | $216,503,522 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
ECHOSTAR CORP
|
|
Bond/Debt | 7.02% | 5.62% |
#2
1
Prev: #1
|
6.3 |
—
|
3,100,000 | 8.2% |
P
S
|
40,925,753 | $146,553,443 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
JAZZ INVESTMENT...
|
|
Bond/Debt | 3.06% | 3.35% |
#3
Prev: #3
|
2.7 |
—
|
-12,500,000 | -19.2% |
P
S
|
52,574,000 | $63,947,544 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
LIVE NATION ENT...
|
|
Bond/Debt | 2.39% | 2.12% |
#4
4
Prev: #8
|
2.5 |
—
|
no change | no change |
P
S
|
32,756,000 | $49,867,734 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
TRANSOCEAN INC
|
|
Unknown | 2.37% | 1.67% |
#5
7
Prev: #12
|
1.9 |
—
|
-2,915,000 | -10.7% |
P
S
|
24,418,000 | $49,511,793 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
PEABODY ENGR CO...
|
|
Bond/Debt | 1.81% | 2.26% |
#6
Prev: #6
|
0.7 |
—
|
-9,606,000 | -31.7% |
P
S
|
20,662,000 | $37,835,117 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
GME
PUT
GAMESTOP CORP
|
PUT Option | 1.34% | 1.30% |
#7
8
Prev: #15
|
1.0 |
—
|
-243,500 | -16.7% |
P
S
|
1,214,000 | $27,970,560 | 2019 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
N/A
NEXTERA ENERGY ...
|
|
Unknown | 1.30% | — |
#8
Prev: #—
|
4.0 |
—
|
540,739 | — |
NEW
|
540,739 | $27,225,938 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
CENTERPOINT ENE...
|
|
Bond/Debt | 1.19% | — |
#9
Prev: #—
|
4.0 |
—
|
21,000,000 | — |
NEW
|
21,000,000 | $24,889,368 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
ALNYLAM PHARMAC...
|
|
Bond/Debt | 1.14% | — |
#10
Prev: #—
|
4.0 |
—
|
18,563,000 | — |
NEW
|
18,563,000 | $23,857,743 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
RSP
INVESCO EXCHANG...
|
Unknown | 0.95% | 0.81% |
#11
10
Prev: #21
|
2.4 |
—
|
8,640 | 9.1% |
P
S
|
103,482 | $19,860,265 | 2023 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
VOO
VANGUARD INDEX ...
|
ETF | 0.92% | 0.88% |
#12
7
Prev: #19
|
0.9 |
—
|
560 | 1.8% |
P
S
|
32,210 | $19,247,086 | 2023 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
N/A
EQUINOX GOLD CO...
|
|
Bond/Debt | 0.92% | 1.97% |
#13
4
Prev: #9
|
0.4 |
—
|
-11,000,000 | -58.1% |
P
S
|
7,936,000 | $19,124,006 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
CORZW
CORE SCIENTIFIC...
|
Unknown | 0.87% | 0.76% |
#14
8
Prev: #22
|
0.8 |
—
|
51,168 | 2.5% |
P
S
|
2,083,119 | $18,206,460 | 2024 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
ALB/PRA
ALBEMARLE CORP
|
Unknown | 0.86% | 0.13% |
#15
119
Prev: #134
|
3.3 |
—
|
200,578 | 402.4% |
P
S
|
250,421 | $17,933,023 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
N/A
AKAMAI TECHNOLO...
|
|
Bond/Debt | 0.86% | 0.68% |
#16
10
Prev: #26
|
0.8 |
—
|
173,000 | 1.1% |
P
S
|
15,678,000 | $17,867,088 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
STRIDE INC
|
|
Bond/Debt | 0.85% | 0.63% |
#17
13
Prev: #30
|
1.3 |
—
|
no change | no change |
P
S
|
10,300,000 | $17,763,298 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
IAU
ISHARES GOLD TR
|
ETF | 0.84% | 0.71% |
#18
5
Prev: #23
|
0.8 |
—
|
2,780 | 1.4% |
P
S
|
200,040 | $17,635,527 | 2023 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
N/A
BRIDGEBIO PHARM...
|
|
Bond/Debt | 0.82% | — |
#19
Prev: #—
|
3.8 |
—
|
10,100,000 | — |
NEW
|
10,100,000 | $17,139,669 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
GLD
PUT
SPDR GOLD TR
|
PUT Option | 0.78% | 1.09% |
#20
4
Prev: #16
|
0.3 |
—
|
-24,000 | -38.7% |
P
S
|
38,000 | $16,351,020 | 2013 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
APO/PRA
APOLLO GLOBAL M...
|
Unknown | 0.78% | 0.04% |
#21
319
Prev: #340
|
3.3 |
—
|
264,653 | 2089.6% |
P
S
|
277,318 | $16,287,607 | 2024 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
N/A
SNOWFLAKE INC
|
|
Bond/Debt | 0.76% | — |
#22
Prev: #—
|
3.8 |
—
|
13,000,000 | — |
NEW
|
13,000,000 | $15,878,577 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
CLOUDFLARE INC
|
|
Bond/Debt | 0.75% | — |
#23
Prev: #—
|
3.8 |
—
|
13,412,000 | — |
NEW
|
13,412,000 | $15,707,800 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
CELCUITY INC
|
|
Bond/Debt | 0.74% | 0.41% |
#24
21
Prev: #45
|
2.8 |
—
|
2,100,000 | 49.9% |
P
S
|
6,310,000 | $15,426,386 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
SPY
CALL
STATE STR SPDR ...
|
CALL Option | 0.70% | 2.20% |
#25
18
Prev: #7
|
0.3 |
—
|
-50,200 | -69.1% |
P
S
|
22,500 | $14,632,650 | 2014 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
KIM/PRN
KIMCO REALTY CO...
|
Unknown | 0.68% | 0.52% |
#26
11
Prev: #37
|
2.3 |
—
|
36,941 | 18.5% |
P
S
|
237,114 | $14,185,511 | 2024 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
MSTR
PUT
STRATEGY INC
|
PUT Option | 0.68% | 1.90% |
#27
17
Prev: #10
|
0.3 |
—
|
-167,800 | -59.6% |
P
S
|
113,600 | $14,177,280 | 2021 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
N/A
MARA HOLDINGS I...
|
|
Bond/Debt | 0.67% | 0.61% |
#28
3
Prev: #31
|
0.8 |
—
|
-500,000 | -2.9% |
P
S
|
16,500,000 | $13,989,937 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
WOLFSPEED INC
|
|
Bond/Debt | 0.65% | 0.45% |
#29
12
Prev: #41
|
2.8 |
—
|
2,434,940 | 35.7% |
P
S
|
9,256,940 | $13,506,199 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
CHEESECAKE FACT...
|
|
Bond/Debt | 0.64% | — |
#30
Prev: #—
|
3.8 |
—
|
13,194,000 | — |
NEW
|
13,194,000 | $13,429,711 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
HOLX
PUT
HOLOGIC INC
|
PUT Option | 0.61% | 0.08% |
#31
151
Prev: #182
|
3.2 |
—
|
144,700 | 588.2% |
P
S
|
169,300 | $12,797,387 | 2015 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
BAC/PRL
BANK AMERICA CO...
|
Preferred | 0.59% | 1.31% |
#32
18
Prev: #14
|
0.2 |
—
|
-13,347 | -56.4% |
P
S
|
10,314 | $12,323,012 | 2018 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
PEN
PUT
PENUMBRA INC
|
PUT Option | 0.59% | — |
#33
Prev: #—
|
3.7 |
—
|
37,200 | — |
NEW
|
37,200 | $12,215,364 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
PEN
PENUMBRA INC
|
Healthcare | 0.57% | — |
#34
Prev: #—
|
3.7 |
—
|
36,140 | — |
NEW
|
36,140 | $11,867,292 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
N/A
GUARDANT HEALTH...
|
|
Bond/Debt | 0.57% | 0.89% |
#35
17
Prev: #18
|
0.2 |
—
|
-3,986,000 | -36.2% |
P
S
|
7,014,000 | $11,804,885 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
EP/PRC
EL PASO ENERGY ...
|
Preferred | 0.55% | 0.05% |
#36
257
Prev: #293
|
3.2 |
—
|
204,471 | 919.7% |
P
S
|
226,704 | $11,561,927 | 2024 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
N/A
MARA HOLDINGS I...
|
|
Bond/Debt | 0.55% | 0.40% |
#37
9
Prev: #46
|
2.2 |
—
|
1,433,000 | 12.5% |
P
S
|
12,933,000 | $11,514,236 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
TLT
PUT
ISHARES TR
|
PUT Option | 0.54% | — |
#38
Prev: #—
|
3.7 |
—
|
130,000 | — |
NEW
|
130,000 | $11,269,700 | 2013 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
N/A
BEYOND MEAT INC
|
|
Bond/Debt | 0.51% | 0.58% |
#39
7
Prev: #32
|
1.2 |
—
|
no change | no change |
P
S
|
17,118,000 | $10,701,283 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
VISHAY INTERTEC...
|
|
Bond/Debt | 0.47% | 0.13% |
#40
87
Prev: #127
|
3.2 |
—
|
6,729,000 | 200.9% |
P
S
|
10,078,000 | $9,716,129 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
MASI
CALL
MASIMO CORP
|
CALL Option | 0.46% | — |
#41
Prev: #—
|
3.7 |
—
|
53,900 | — |
NEW
|
53,900 | $9,587,193 | 2013 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
N/A
BROOKDALE SR LI...
|
|
Bond/Debt | 0.46% | 0.34% |
#42
14
Prev: #56
|
1.2 |
—
|
no change | no change |
P
S
|
5,632,000 | $9,536,395 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
PUT
XEROX HOLDINGS ...
|
|
PUT Option | 0.44% | — |
#43
Prev: #—
|
3.7 |
—
|
7,160,000 | — |
NEW
|
7,160,000 | $9,236,400 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
CSG SYS INTL IN...
|
|
Bond/Debt | 0.44% | 0.26% |
#44
24
Prev: #68
|
3.2 |
—
|
2,500,000 | 50.0% |
P
S
|
7,500,000 | $9,126,195 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
HOLX
HOLOGIC INC
|
Healthcare | 0.43% | 0.05% |
#45
239
Prev: #284
|
3.2 |
—
|
102,295 | 652.7% |
P
S
|
117,968 | $8,917,201 | 2015 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
SPE/PRC
SPECIAL OPPORTU...
|
Preferred | 0.41% | 0.36% |
#46
7
Prev: #53
|
2.2 |
—
|
21,567 | 6.7% |
P
S
|
344,986 | $8,552,272 | 2022 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
STEW
SRH TOTAL RETUR...
|
Financial Services | 0.38% | 0.38% |
#47
2
Prev: #49
|
1.2 |
—
|
no change | no change |
P
S
|
461,965 | $7,899,602 | 2013 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
N/A
SOUTHERN CO
|
|
Bond/Debt | 0.38% | 0.01% |
#48
763
Prev: #811
|
3.2 |
—
|
6,973,000 | 5405.4% |
P
S
|
7,102,000 | $7,897,048 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
N/A
STRATEGY INC
|
|
Bond/Debt | 0.37% | 0.39% |
#49
1
Prev: #48
|
0.6 |
—
|
-385,000 | -4.9% |
P
S
|
7,500,000 | $7,699,808 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
HPE/PRC
HEWLETT PACKARD...
|
Unknown | 0.36% | 0.05% |
#50
247
Prev: #297
|
3.1 |
—
|
98,217 | 603.2% |
P
S
|
114,501 | $7,456,305 | 2024 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 |
Showing 1-50 of 1297 holdings