Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| 1 |
NVIDIA
NVDA
|
+$114M |
| 2 |
Citigroup
C
|
+$77M |
| 3 |
Broadcom
AVGO
|
+$53M |
| 4 |
Pinduoduo
PDD
|
+$49.7M |
| 5 |
Intel
INTC
|
+$44.5M |
Top Sells
| 1 |
Energy Select Sector SPDR Fund
XLE
|
+$92.5M |
| 2 |
Pfizer
PFE
|
+$67.5M |
| 3 |
Boeing
BA
|
+$66.7M |
| 4 |
Direxion Daily Semiconductor Bull 3X Shares
SOXL
|
+$44.9M |
| 5 |
PayPal
PYPL
|
+$44.4M |
Sector Composition
| 1 | Technology | 27.91% |
| 2 | Consumer Discretionary | 14.92% |
| 3 | Healthcare | 10.74% |
| 4 | Financials | 10.11% |
| 5 | Materials | 6.23% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
926
C4 Therapeutics
CCCC
$188M
| $194K | ﹤0.01% |
42,101
-7,168
| -15% | -$33K |
|
927
ProShares Ether Strategy ETF
EETH
$114M
| $194K | ﹤0.01% |
+2,752
| New | +$194K |
|
928
FerroAtlántica
GSM
$780M
| $194K | ﹤0.01% |
36,302
-53,253
| -59% | -$285K |
|
929
RenaissanceRe
RNR
$11.2B
| $194K | ﹤0.01% |
868
-5,087
| -85% | -$1.14M |
|
|
ALTM
930
DELISTED
Arcadium Lithium plc
ALTM
| $194K | ﹤0.01% |
57,797
-49,169
| -46% | -$165K |
|
|
CAN
931
Canaan Creative
CAN
$384M
| $193K | ﹤0.01% |
193,649
-220,588
| -53% | -$220K |
|
932
TriplePoint Venture Growth BDC
TPVG
$269M
| $192K | ﹤0.01% |
23,969
+21,122
| +742% | +$169K |
|
933
iRhythm Technologies
IRTC
$5.85B
| $191K | ﹤0.01% |
1,783
-2,128
| -54% | -$228K |
|
934
Seadrill
SDRL
$2.02B
| $191K | ﹤0.01% |
3,714
+3,098
| +503% | +$159K |
|
935
ProShares Ultra Dow30
DDM
$452M
| $190K | ﹤0.01% |
2,296
-7,920
| -78% | -$655K |
|
936
Applied Optoelectronics
AAOI
$1.67B
| $189K | ﹤0.01% |
22,908
-24,766
| -52% | -$204K |
|
937
Marriott International Class A Common Stock
MAR
$71.2B
| $189K | ﹤0.01% |
+782
| New | +$189K |
|
938
Comtech Telecommunications
CMTL
$68.2M
| $187K | ﹤0.01% |
61,814
+31,760
| +106% | +$96.1K |
|
939
Corsair Gaming
CRSR
$929M
| $187K | ﹤0.01% |
+17,022
| New | +$187K |
|
940
Brunswick
BC
$4.36B
| $186K | ﹤0.01% |
+2,564
| New | +$186K |
|
|
EXK
941
Endeavour Silver
EXK
$1.78B
| $186K | ﹤0.01% |
52,988
-13,082
| -20% | -$45.9K |
|
942
LGI Homes
LGIH
$1.41B
| $186K | ﹤0.01% |
+2,087
| New | +$186K |
|
943
Toyota
TM
$257B
| $186K | ﹤0.01% |
912
-169
| -16% | -$34.5K |
|
944
Cantaloupe
CTLP
$789M
| $185K | ﹤0.01% |
28,085
+7,436
| +36% | +$49K |
|
945
iShares S&P GSCI Commodity-Indexed Trust
GSG
$992M
| $185K | ﹤0.01% |
8,396
+2,175
| +35% | +$47.9K |
|
946
Integral Ad Science
IAS
$1.44B
| $185K | ﹤0.01% |
19,075
+8,481
| +80% | +$82.3K |
|
|
ACCD
947
DELISTED
Accolade, Inc. Common Stock
ACCD
| $185K | ﹤0.01% |
51,772
+27,695
| +115% | +$99K |
|
|
TBCH
948
Turtle Beach Corporation Common Stock
TBCH
$297M
| $184K | ﹤0.01% |
12,865
-35,845
| -74% | -$513K |
|
949
Ceragon Networks
CRNT
$180M
| $180K | ﹤0.01% |
72,053
+67,100
| +1,355% | +$168K |
|
950
Shutterstock
SSTK
$715M
| $179K | ﹤0.01% |
4,646
+205
| +5% | +$7.9K |
|