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 | |
|---|---|---|---|---|---|---|
|
VPU
4001
Vanguard Utilities ETF
VPU
$8.68B
| $260K | ﹤0.01% |
1,769
+1,277
| +260% | +$189K |
|
|
ROVR
4002
CALL
DELISTED
Rover Group, Inc. Class A Common Stock
ROVR
| $260K | ﹤0.01% |
57,500
-34,400
| -37% | -$139K |
|
4003
PUT
DaVita
DVA
$15.4B
| $259K | ﹤0.01% |
3,200
-41,100
| -93% | -$3.29M |
|
|
OPTU
4004
CALL
Optimum Communications Inc
OPTU
$298M
| $258K | ﹤0.01% |
75,600
-176,400
| -70% | -$750K |
|
4005
Kyndryl
KD
$2.94B
| $258K | ﹤0.01% |
17,484
-57,969
| -77% | -$823K |
|
4006
NextDecade
NEXT
$1.63B
| $258K | ﹤0.01% |
51,943
+43,406
| +508% | +$252K |
|
|
OTLY
4007
CALL
Oatly Group
OTLY
$473M
| $258K | ﹤0.01% |
5,335
-3,465
| -39% | -$162K |
|
4008
CALL
Sturm, Ruger & Co
RGR
$611M
| $258K | ﹤0.01% |
4,500
-4,400
| -49% | -$245K |
|
4009
PUT
Astronics
ATRO
$3.37B
| $257K | ﹤0.01% |
23,160
+6,000
| +35% | +$67K |
|
4010
CALL
Kornit Digital
KRNT
$708M
| $257K | ﹤0.01% |
13,300
-56,800
| -81% | -$1.28M |
|
|
HAPN
4011
Happen Inc
HAPN
$2.19B
| $257K | ﹤0.01% |
35,763
-24,705
| -41% | -$220K |
|
4012
PennyMac Financial
PFSI
$4.45B
| $257K | ﹤0.01% |
+4,324
| New | +$268K |
|
4013
CALL
Qiagen
QGEN
$8.72B
| $257K | ﹤0.01% |
5,281
-22,162
| -81% | -$1.13M |
|
4014
Urban One Class A
UONE
$23.6M
| $257K | ﹤0.01% |
3,408
+3,134
| +1,144% | +$206K |
|
|
GRTS
4015
PUT
DELISTED
Gritstone bio, Inc. Common Stock
GRTS
| $257K | ﹤0.01% |
92,700
+78,400
| +548% | +$224K |
|
|
ME
4016
CALL
DELISTED
23andMe Holding Co
ME
| $257K | ﹤0.01% |
5,655
-4,725
| -46% | -$228K |
|
|
BLD
4017
DELISTED
TopBuild
BLD
| $256K | ﹤0.01% |
1,233
+1,127
| +1,063% | +$218K |
|
4018
PUT
Joby Aviation
JOBY
$7.15B
| $256K | ﹤0.01% |
59,100
+6,900
| +13% | +$28.5K |
|
|
KC
4019
PUT
Kingsoft Cloud Holdings
KC
$3.03B
| $256K | ﹤0.01% |
28,800
+800
| +3% | +$3.92K |
|
|
RJET
4020
CALL
Republic Airways Holdings
RJET
$863M
| $256K | ﹤0.01% |
7,213
+7,133
| +8,916% | +$298K |
|
4021
PUT
Rocket Lab Corp
RKLB
$39.9B
| $256K | ﹤0.01% |
63,600
+2,500
| +4% | +$11.2K |
|
4022
PUT
Voyager Therapeutics
VYGR
$184M
| $256K | ﹤0.01% |
33,300
+28,900
| +657% | +$230K |
|
4023
W&T Offshore
WTI
$473M
| $256K | ﹤0.01% |
+50,586
| New | +$283K |
|
4024
PUT
Ardmore Shipping
ASC
$669M
| $255K | ﹤0.01% |
17,200
-2,700
| -14% | -$42.4K |
|
4025
PUT
FIGS
FIGS
$1.73B
| $255K | ﹤0.01% |
41,300
-28,800
| -41% | -$222K |
|
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.