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 |
SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$32.1M |
| 2 |
PARA
Paramount Global Class B
PARA
|
+$23.3M |
| 3 |
Pinduoduo
PDD
|
+$17.3M |
| 4 |
Pfizer
PFE
|
+$16.8M |
| 5 |
American Airlines Group
AAL
|
+$14.5M |
Top Sells
| 1 |
Amazon
AMZN
|
+$64.4M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 3 |
AutoZone
AZO
|
+$32.2M |
| 4 |
SPDR S&P 500 ETF Trust
SPY
|
+$25.3M |
| 5 |
Apple
AAPL
|
+$22.5M |
Sector Composition
| 1 | Technology | 20.25% |
| 2 | Consumer Discretionary | 15.22% |
| 3 | Healthcare | 10.03% |
| 4 | Financials | 9.2% |
| 5 | Industrials | 9.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
1776
Transact Technologies
TACT
$46.9M
| $42K | ﹤0.01% |
3,922
+384
| +11% | +$4.11K |
|
1777
Cardlytics
CDLX
$81.5M
| $41K | ﹤0.01% |
375
| – | – |
|
1778
Collegium Pharmaceutical
COLL
$1.12B
| $41K | ﹤0.01% |
+1,759
| New | +$41K |
|
1779
Gartner
IT
$19B
| $41K | ﹤0.01% |
+227
| New | +$41K |
|
1780
MiMedx Group
MDXG
$1.03B
| $41K | ﹤0.01% |
4,028
-4,217
| -51% | -$42.9K |
|
1781
Quanterix
QTRX
$245M
| $41K | ﹤0.01% |
708
+508
| +254% | +$29.4K |
|
1782
RH
RH
$4.32B
| $41K | ﹤0.01% |
70
| – | – |
|
1783
SandRidge Energy
SD
$431M
| $41K | ﹤0.01% |
10,635
-1,785
| -14% | -$6.88K |
|
1784
Soleno Therapeutics
SLNO
$2.64B
| $41K | ﹤0.01% |
2,192
+1,074
| +96% | +$20.1K |
|
1785
Suburban Propane Partners
SPH
$1.21B
| $41K | ﹤0.01% |
2,827
-7,877
| -74% | -$114K |
|
1786
Build-A-Bear
BBW
$980M
| $40K | ﹤0.01% |
+5,927
| New | +$40K |
|
1787
California Water Service
CWT
$2.68B
| $40K | ﹤0.01% |
+716
| New | +$40K |
|
1788
iShares Core Dividend Growth ETF
DGRO
$34B
| $40K | ﹤0.01% |
+849
| New | +$40K |
|
|
ELME
1789
Elme Communities
ELME
$1.5B
| $40K | ﹤0.01% |
+1,844
| New | +$40K |
|
1790
FuelCell Energy
FCEL
$219M
| $40K | ﹤0.01% |
93
-415
| -82% | -$178K |
|
1791
Genie Energy
GNE
$395M
| $40K | ﹤0.01% |
6,359
+5,360
| +537% | +$33.7K |
|
1792
iShares Genomics Immunology and Healthcare ETF
IDNA
$114M
| $40K | ﹤0.01% |
878
+734
| +510% | +$33.4K |
|
1793
iShares Europe ETF
IEV
$2.29B
| $40K | ﹤0.01% |
802
+71
| +10% | +$3.54K |
|
1794
MINISO
MNSO
$7.58B
| $40K | ﹤0.01% |
1,700
-12,020
| -88% | -$283K |
|
1795
Nomura Holdings
NMR
$22.1B
| $40K | ﹤0.01% |
7,510
+7,509
| +750,900% | +$40K |
|
|
ORKA
1796
Oruka Therapeutics, Inc. Common Stock
ORKA
$558M
| $40K | ﹤0.01% |
927
+898
| +3,097% | +$38.7K |
|
|
ME
1797
DELISTED
23andMe Holding Co. Class A Common Stock
ME
| $40K | ﹤0.01% |
200
-5,048
| -96% | -$1.01M |
|
|
CONE
1798
DELISTED
CyrusOne Inc Common Stock
CONE
| $40K | ﹤0.01% |
602
-2,769
| -82% | -$184K |
|
1799
Clean Harbors
CLH
$12.6B
| $39K | ﹤0.01% |
+474
| New | +$39K |
|
1800
California Resources
CRC
$4.69B
| $39K | ﹤0.01% |
+1,640
| New | +$39K |
|