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 | |
|---|---|---|---|---|---|---|
726
PUT
Electronic Arts
EA
$52.4B
| $14.5M | 0.01% |
120,600
-56,200
| -32% | -$6.6M |
|
727
CALL
Unilever
UL
$133B
| $14.5M | 0.01% |
247,644
+46,666
| +23% | +$2.65M |
|
|
FISV
728
PUT
Fiserv Inc
FISV
$26.8B
| $14.4M | 0.01% |
127,200
+35,500
| +39% | +$3.91M |
|
729
PUT
Alnylam Pharmaceuticals
ALNY
$35.6B
| $14.3M | 0.01% |
71,600
+11,800
| +20% | +$2.48M |
|
730
PUT
Floor & Decor
FND
$5.86B
| $14.3M | 0.01% |
145,900
+127,400
| +689% | +$11.4M |
|
731
CALL
Aflac
AFL
$62.9B
| $14.3M | 0.01% |
222,000
-22,500
| -9% | -$1.54M |
|
732
FedEx
FDX
$75.9B
| $14.3M | 0.01% |
62,644
+34,635
| +124% | +$7.03M |
|
|
B
733
Barrick Mining
B
$62.8B
| $14.3M | 0.01% |
769,372
-436,035
| -36% | -$7.84M |
|
734
CALL
Stryker
SYK
$119B
| $14.3M | 0.01% |
50,000
+13,000
| +35% | +$3.45M |
|
|
735
PUT
Stryker
SYK
$119B
| $14.2M | 0.01% |
49,900
+5,400
| +12% | +$1.43M |
|
736
ProShares UltraPro Short QQQ
SQQQ
$2.02B
| $14.2M | 0.01% |
+19,396
| New | +$19.1M |
|
737
CALL
Fidelity National Information Services
FIS
$21B
| $14.2M | 0.01% |
262,000
-27,200
| -9% | -$1.77M |
|
738
PUT
C3.ai
AI
$1.27B
| $14.2M | 0.01% |
422,100
+417,400
| +8,881% | +$8.55M |
|
|
MRO
739
PUT
DELISTED
Marathon Oil Corporation
MRO
| $14.2M | 0.01% |
590,900
+55,600
| +10% | +$1.42M |
|
740
CALL
Sunrun
RUN
$2.61B
| $14.1M | 0.01% |
700,300
+205,200
| +41% | +$4.79M |
|
741
PUT
Vale
VALE
$63.2B
| $14.1M | 0.01% |
894,100
-586,200
| -40% | -$9.93M |
|
742
CALL
Idexx Laboratories
IDXX
$43B
| $14.1M | 0.01% |
28,200
-8,500
| -23% | -$4.07M |
|
743
CrowdStrike
CRWD
$192B
| $14.1M | 0.01% |
410,024
+409,724
| +136,575% | +$11.8M |
|
744
CALL
Enterprise Products Partners
EPD
$84.1B
| $14.1M | 0.01% |
542,700
+123,900
| +30% | +$3.18M |
|
|
KRTX
745
CALL
DELISTED
Karuna Therapeutics, Inc. Common Stock
KRTX
| $14M | 0.01% |
77,300
+58,400
| +309% | +$11.2M |
|
746
PUT
Toll Brothers
TOL
$13.9B
| $14M | 0.01% |
233,800
+82,000
| +54% | +$4.73M |
|
747
CALL
Fortinet
FTNT
$114B
| $14M | 0.01% |
211,000
-111,800
| -35% | -$6.36M |
|
748
PUT
Ralph Lauren
RL
$23B
| $14M | 0.01% |
119,800
+29,500
| +33% | +$3.48M |
|
749
CALL
Dell
DELL
$285B
| $14M | 0.01% |
347,000
-31,700
| -8% | -$1.28M |
|
|
TYNS
750
PUT
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $13.9M | 0.01% |
240,700
+186,500
| +344% | +$10.8M |
|
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.