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 | |
|---|---|---|---|---|---|---|
4051
Eagle Materials
EXP
$6.86B
| $251K | ﹤0.01% |
+1,713
| New | +$243K |
|
4052
CALL
Lazard
LAZ
$4.21B
| $251K | ﹤0.01% |
7,600
+2,900
| +62% | +$107K |
|
4053
Lear
LEA
$7.45B
| $251K | ﹤0.01% |
+1,803
| New | +$249K |
|
4054
PUT
MINISO
MNSO
$3.73B
| $251K | ﹤0.01% |
14,200
-600
| -4% | -$9.67K |
|
4055
CALL
Yext
YEXT
$564M
| $251K | ﹤0.01% |
26,200
+4,100
| +19% | +$31.6K |
|
4056
CALL
Clean Energy Fuels
CLNE
$421M
| $250K | ﹤0.01% |
57,500
-145,700
| -72% | -$752K |
|
4057
CALL
Highwoods Properties
HIW
$3.71B
| $250K | ﹤0.01% |
10,800
+2,400
| +29% | +$64.6K |
|
4058
Mid-America Apartment Communities
MAA
$15.8B
| $250K | ﹤0.01% |
1,661
+1,102
| +197% | +$175K |
|
4059
CALL
Ingevity
NGVT
$2.59B
| $250K | ﹤0.01% |
+3,500
| New | +$278K |
|
4060
PUT
Global X MSCI Norway ETF
NORW
$85M
| $250K | ﹤0.01% |
12,500
-11,000
| -47% | -$276K |
|
4061
Perma-Fix Environmental Services
PESI
$353M
| $250K | ﹤0.01% |
+21,246
| New | +$138K |
|
4062
SkinHealth Systems
SKIN
$90.5M
| $250K | ﹤0.01% |
19,865
-8,213
| -29% | -$95K |
|
|
ARAV
4063
CALL
DELISTED
Aravive, Inc. Common Stock
ARAV
| $250K | ﹤0.01% |
125,100
-400
| -0.3% | -$751 |
|
4064
PUT
ArcBest
ARCB
$3.33B
| $249K | ﹤0.01% |
2,700
+100
| +4% | +$8.99K |
|
4065
PUT
American Resources Corp
AREC
$184M
| $249K | ﹤0.01% |
166,400
-68,300
| -29% | -$102K |
|
4066
Iridium Communications
IRDM
$4.81B
| $249K | ﹤0.01% |
+4,028
| New | +$241K |
|
4067
PUT
United Bankshares
UBSI
$6.71B
| $249K | ﹤0.01% |
7,100
+2,900
| +69% | +$114K |
|
4068
PUT
United States Gasoline Fund
UGA
$142M
| $249K | ﹤0.01% |
4,100
-7,500
| -65% | -$443K |
|
|
BLUE
4069
CALL
DELISTED
bluebird bio
BLUE
| $248K | ﹤0.01% |
4,050
-825
| -17% | -$94.2K |
|
4070
CALL
Kratos Defense & Security Solutions
KTOS
$9.12B
| $248K | ﹤0.01% |
18,400
-28,500
| -61% | -$340K |
|
4071
Molson Coors Class B
TAP
$7.97B
| $248K | ﹤0.01% |
4,800
-30,201
| -86% | -$1.56M |
|
4072
CALL
Trupanion
TRUP
$1.11B
| $248K | ﹤0.01% |
5,800
+4,200
| +263% | +$227K |
|
|
NEWR
4073
PUT
DELISTED
New Relic, Inc.
NEWR
| $248K | ﹤0.01% |
3,300
-21,300
| -87% | -$1.44M |
|
4074
Boot Barn
BOOT
$4.81B
| $247K | ﹤0.01% |
+3,235
| New | +$248K |
|
4075
Global X Robotics & Artificial Intelligence ETF
BOTZ
$3.17B
| $247K | ﹤0.01% |
9,712
+114
| +1% | +$2.68K |
|
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.