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
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$67.5M |
| 2 |
Palantir
PLTR
|
+$64.7M |
| 3 |
PARA
Paramount Global Class B
PARA
|
+$31.5M |
| 4 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$30.7M |
| 5 |
Carnival Corporation Ltd
CCL
|
+$25.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
Tesla
TSLA
|
+$53.7M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 4 |
Invesco QQQ Trust
QQQ
|
+$37.6M |
| 5 |
AutoZone
AZO
|
+$28.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.65% |
| 2 | Consumer Discretionary | 0.49% |
| 3 | Healthcare | 0.32% |
| 4 | Financials | 0.3% |
| 5 | Industrials | 0.29% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
IGAC
1801
PUT
DELISTED
IG Acquisition Corp. Class A Common Stock
IGAC
| $1.69M | ﹤0.01% |
+1,714
| New | +$17.7K |
|
|
CRON
1802
CALL
Cronos Group
CRON
$1.05B
| $1.69M | ﹤0.01% |
+1,789
| New | +$18.9K |
|
1803
CALL
Telus
TU
$16B
| $1.69M | ﹤0.01% |
849
+825
| +3,438% | +$17.1K |
|
|
AYX
1804
DELISTED
Alteryx Inc
AYX
| $1.69M | ﹤0.01% |
20,401
+12,795
| +168% | +$1.36M |
|
|
STOR
1805
CALL
DELISTED
STORE Capital Corporation
STOR
| $1.69M | ﹤0.01% |
505
+186
| +58% | +$6.05K |
|
1806
PUT
Welltower
WELL
$178B
| $1.69M | ﹤0.01% |
236
-169
| -42% | -$11.3K |
|
|
SKX
1807
CALL
DELISTED
Skechers
SKX
| $1.69M | ﹤0.01% |
405
-192
| -32% | -$7.25K |
|
1808
CALL
Noodles & Co
NDLS
$90.5M
| $1.69M | ﹤0.01% |
204
+175
| +603% | +$13.6K |
|
1809
CALL
Bionano Genomics
BNGO
$12.7M
| $1.69M | ﹤0.01% |
+3
| New | +$16.9K |
|
1810
C3.ai
AI
$1.27B
| $1.68M | ﹤0.01% |
25,537
+23,300
| +1,042% | +$2.71M |
|
1811
CALL
Fidelity National Financial
FNF
$13.9B
| $1.68M | ﹤0.01% |
431
-137
| -24% | -$5.2K |
|
1812
Teucrium Soybean Fund
SOYB
$57.2M
| $1.68M | ﹤0.01% |
+77,867
| New | +$1.61M |
|
1813
Pan American Silver
PAAS
$18.6B
| $1.68M | ﹤0.01% |
56,032
-18,010
| -24% | -$585K |
|
1814
CALL
Gartner
IT
$9.41B
| $1.68M | ﹤0.01% |
92
-165
| -64% | -$28.7K |
|
|
DADA
1815
CALL
DELISTED
Dada Nexus
DADA
| $1.68M | ﹤0.01% |
618
+617
| +61,700% | +$23.5K |
|
1816
CALL
Philips
PHG
$25.4B
| $1.68M | ﹤0.01% |
363
+254
| +233% | +$11.5K |
|
|
DMTK
1817
CALL
DELISTED
DermTech, Inc. Common Stock
DMTK
| $1.68M | ﹤0.01% |
330
-138
| -29% | -$7.22K |
|
1818
CALL
Leidos
LDOS
$14.1B
| $1.68M | ﹤0.01% |
174
+44
| +34% | +$4.45K |
|
|
VISN
1819
Vistance Networks Inc
VISN
$2.66B
| $1.67M | ﹤0.01% |
+109,011
| New | +$1.63M |
|
1820
iQIYI
IQ
$1.18B
| $1.67M | ﹤0.01% |
100,739
-75,332
| -43% | -$1.74M |
|
1821
PUT
Whirlpool
WHR
$2.42B
| $1.67M | ﹤0.01% |
+76
| New | +$15.1K |
|
|
NOVA
1822
CALL
DELISTED
Sunnova Energy
NOVA
| $1.67M | ﹤0.01% |
410
+221
| +117% | +$9.81K |
|
1823
S&P Global
SPGI
$126B
| $1.67M | ﹤0.01% |
+4,740
| New | +$1.58M |
|
1824
CALL
Helmerich & Payne
HP
$3.53B
| $1.67M | ﹤0.01% |
620
+116
| +23% | +$3.21K |
|
1825
PUT
United Microelectronic
UMC
$48.9B
| $1.67M | ﹤0.01% |
1,835
+1,220
| +198% | +$11.3K |
|
Similar funds
Simplex Trading's Q1 2021 Portfolio in Review
As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading withdrew a net $23.5B in Q1 2021, closing 1,706 positions and reducing 3,151 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $38.1M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.65% of assets, up from 0.37% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Pfizer worth $16.8M.
- Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
- Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
- Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
- Simplex Trading opened 2,258 new positions and closed 1,706 in Q1 2021.
- Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.
Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.