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 |
Walmart Inc
WMT
|
+$43.6M |
| 2 |
Apple
AAPL
|
+$40.9M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$37.7M |
| 4 |
Citigroup
C
|
+$34.2M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$32.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$189M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 3 |
NVIDIA
NVDA
|
+$115M |
| 4 |
Tesla
TSLA
|
+$52M |
| 5 |
Meta Platforms (Facebook)
META
|
+$49M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.42% |
| 2 | Consumer Discretionary | 0.2% |
| 3 | Healthcare | 0.17% |
| 4 | Industrials | 0.15% |
| 5 | Communication Services | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2101
iShares S&P 500 Value ETF
IVE
$48.9B
| $1.66M | ﹤0.01% |
+10,919
| New | +$1.65M |
|
2102
PUT
United Therapeutics
UTHR
$26.3B
| $1.66M | ﹤0.01% |
7,400
+4,300
| +139% | +$1.06M |
|
2103
UiPath
PATH
$5.62B
| $1.66M | ﹤0.01% |
+94,311
| New | +$1.43M |
|
2104
CALL
Ameriprise Financial
AMP
$46.8B
| $1.66M | ﹤0.01% |
5,400
-11,500
| -68% | -$3.77M |
|
2105
PUT
Teradata
TDC
$2.68B
| $1.66M | ﹤0.01% |
41,100
+1,700
| +4% | +$63.2K |
|
2106
Aramark
ARMK
$15B
| $1.65M | ﹤0.01% |
+63,947
| New | +$1.82M |
|
2107
CALL
Monolithic Power Systems
MPWR
$65.5B
| $1.65M | ﹤0.01% |
3,300
-2,700
| -45% | -$1.24M |
|
2108
CALL
Old Republic International
ORI
$10.3B
| $1.65M | ﹤0.01% |
66,000
-24,000
| -27% | -$604K |
|
|
NATI
2109
CALL
DELISTED
National Instruments Corp
NATI
| $1.65M | ﹤0.01% |
31,400
-70,400
| -69% | -$3.53M |
|
2110
PUT
Doximity
DOCS
$3.67B
| $1.64M | ﹤0.01% |
50,800
-77,500
| -60% | -$2.57M |
|
2111
CALL
Array Technologies
ARRY
$818M
| $1.64M | ﹤0.01% |
75,100
-100,500
| -57% | -$2.06M |
|
2112
CALL
Bath & Body Works
BBWI
$4.01B
| $1.64M | ﹤0.01% |
44,900
-166,300
| -79% | -$6.97M |
|
2113
CALL
Leggett & Platt
LEG
$1.52B
| $1.64M | ﹤0.01% |
51,500
| – | – |
|
2114
CALL
Liberty Energy
LBRT
$2.83B
| $1.64M | ﹤0.01% |
128,000
+59,600
| +87% | +$882K |
|
2115
PUT
Aehr Test Systems
AEHR
$2.48B
| $1.64M | ﹤0.01% |
52,800
+16,100
| +44% | +$519K |
|
2116
Alphabet (Google) Class A
GOOGL
$3.91T
| $1.64M | ﹤0.01% |
15,789
-316,085
| -95% | -$30.3M |
|
2117
CALL
Goodyear
GT
$2.07B
| $1.64M | ﹤0.01% |
148,600
-231,100
| -61% | -$2.56M |
|
2118
CALL
iRhythm Holdings
IRTC
$3.59B
| $1.64M | ﹤0.01% |
13,200
+2,900
| +28% | +$315K |
|
2119
PUT
Trane Technologies
TT
$106B
| $1.64M | ﹤0.01% |
8,900
+8,700
| +4,350% | +$1.58M |
|
2120
PUT
Rocket Companies
RKT
$36.9B
| $1.64M | ﹤0.01% |
180,600
-322,400
| -64% | -$2.78M |
|
|
PRVB
2121
CALL
DELISTED
Provention Bio, Inc. Common Stock
PRVB
| $1.64M | ﹤0.01% |
67,900
-61,100
| -47% | -$767K |
|
2122
PUT
Celanese
CE
$5.09B
| $1.63M | ﹤0.01% |
15,000
+11,600
| +341% | +$1.34M |
|
2123
PUT
H&R Block
HRB
$5.18B
| $1.63M | ﹤0.01% |
46,300
-41,400
| -47% | -$1.53M |
|
|
JMIA
2124
PUT
Jumia Technologies
JMIA
$726M
| $1.63M | ﹤0.01% |
496,100
+433,300
| +690% | +$1.56M |
|
|
ARNC
2125
PUT
DELISTED
Arconic Corporation
ARNC
| $1.63M | ﹤0.01% |
62,200
+50,100
| +414% | +$1.23M |
|
Similar funds
Simplex Trading's Q1 2023 Portfolio in Review
As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.
By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.
- Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
- Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
- Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
- Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
- Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
- Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
- Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.
Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.