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 | |
|---|---|---|---|---|---|---|
|
SBNY
7501
CALL
DELISTED
Signature Bank
SBNY
| $11K | ﹤0.01% |
65,300
+1,900
| +3% | +$229K |
|
7502
Achieve Life Sciences
ACHV
$634M
| $10K | ﹤0.01% |
1,527
+1,458
| +2,113% | +$6.93K |
|
|
ACR
7503
PUT
ACRES Commercial Realty
ACR
$129M
| $10K | ﹤0.01% |
+1,100
| New | +$10.4K |
|
7504
PUT
ADT
ADT
$5.38B
| $10K | ﹤0.01% |
1,500
-117,200
| -99% | -$956K |
|
7505
Ameren
AEE
$31.1B
| $10K | ﹤0.01% |
+123
| New | +$10.5K |
|
7506
CALL
America Movil
AMX
$77.2B
| $10K | ﹤0.01% |
500
+400
| +400% | +$8.2K |
|
7507
CALL
Ashland
ASH
$3.11B
| $10K | ﹤0.01% |
100
-500
| -83% | -$51.9K |
|
7508
CALL
AXIS Capital
AXS
$8.79B
| $10K | ﹤0.01% |
200
-3,600
| -95% | -$209K |
|
7509
abrdn Bloomberg All Commodity Strategy K-1 Free ETF
BCI
$2.92B
| $10K | ﹤0.01% |
484
-4,766
| -91% | -$100K |
|
7510
Bioceres Crop Solutions
BIOX
$20.6M
| $10K | ﹤0.01% |
934
-1,830
| -66% | -$21.5K |
|
7511
CALL
Smartbird Inc
BIRD
$21M
| $10K | ﹤0.01% |
425
+110
| +35% | +$5.07K |
|
|
BLCN
7512
PUT
DELISTED
Siren ETF Trust Siren NexGen Economy ETF
BLCN
| $10K | ﹤0.01% |
+500
| New | +$10.9K |
|
|
BRDG
7513
CALL
DELISTED
Bridge Investment Group
BRDG
| $10K | ﹤0.01% |
900
+200
| +29% | +$2.7K |
|
|
BRKL
7514
CALL
DELISTED
Brookline Bancorp
BRKL
| $10K | ﹤0.01% |
1,000
+900
| +900% | +$11.3K |
|
7515
PUT
Betterware México
BWMX
$643M
| $10K | ﹤0.01% |
900
+600
| +200% | +$5.55K |
|
7516
PUT
Cadre Holdings
CDRE
$1.43B
| $10K | ﹤0.01% |
500
-100
| -17% | -$2.16K |
|
|
CDTX
7517
CALL
DELISTED
Cidara Therapeutics
CDTX
| $10K | ﹤0.01% |
+425
| New | +$12.1K |
|
7518
PUT
CION Investment
CION
$306M
| $10K | ﹤0.01% |
1,100
-11,600
| -91% | -$122K |
|
7519
CALL
Clene
CLNN
$63.8M
| $10K | ﹤0.01% |
455
-130
| -22% | -$3.37K |
|
7520
PUT
Torrid Holdings
CURV
$271M
| $10K | ﹤0.01% |
2,300
-7,800
| -77% | -$24.7K |
|
7521
CALL
Ducommun
DCO
$2.68B
| $10K | ﹤0.01% |
200
+100
| +100% | +$5.45K |
|
7522
CALL
Digi International
DGII
$2.53B
| $10K | ﹤0.01% |
300
-700
| -70% | -$23.9K |
|
7523
CALL
1stdibs.com
DIBS
$146M
| $10K | ﹤0.01% |
2,600
+2,400
| +1,200% | +$12.2K |
|
|
DOCU
7524
DocuSign
DOCU
$10.7B
| $10K | ﹤0.01% |
177
-36,732
| -100% | -$2.19M |
|
7525
Enanta Pharmaceuticals
ENTA
$367M
| $10K | ﹤0.01% |
250
| – | – |
|
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.