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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5701
PUT
Hexcel
HXL
$7.79B
| $73K | ﹤0.01% |
1,000
+800
| +400% | +$54.1K |
|
5702
International Money Express
IMXI
$357M
| $73K | ﹤0.01% |
3,346
-4,934
| -60% | -$94.7K |
|
5703
Sana Biotechnology
SANA
$871M
| $73K | ﹤0.01% |
18,080
+10,913
| +152% | +$40.2K |
|
|
SKE
5704
PUT
Skeena Resources
SKE
$3.3B
| $73K | ﹤0.01% |
15,100
+4,700
| +45% | +$19.8K |
|
|
TWKS
5705
CALL
DELISTED
Thoughtworks Holding, Inc. Common Stock
TWKS
| $73K | ﹤0.01% |
15,200
-81,100
| -84% | -$333K |
|
5706
PUT
ALX Oncology
ALXO
$261M
| $72K | ﹤0.01% |
+4,900
| New | +$46.5K |
|
5707
Atomera
ATOM
$200M
| $72K | ﹤0.01% |
10,358
-18,923
| -65% | -$126K |
|
5708
CALL
Sierra Bancorp
BSRR
$528M
| $72K | ﹤0.01% |
+3,200
| New | +$62.1K |
|
5709
Cardlytics
CDLX
$21.7M
| $72K | ﹤0.01% |
789
-487
| -38% | -$49.5K |
|
5710
PUT
Clean Energy Fuels
CLNE
$427M
| $72K | ﹤0.01% |
19,000
-27,600
| -59% | -$101K |
|
5711
Genesco
GCO
$425M
| $72K | ﹤0.01% |
2,049
-1,040
| -34% | -$32K |
|
5712
PUT
Greif
GEF
$4.92B
| $72K | ﹤0.01% |
1,100
-300
| -21% | -$19.8K |
|
5713
PUT
Gildan
GIL
$10.3B
| $72K | ﹤0.01% |
2,200
-100
| -4% | -$3.24K |
|
5714
PUT
Hims & Hers Health
HIMS
$6.43B
| $72K | ﹤0.01% |
8,200
-63,000
| -88% | -$466K |
|
5715
Ivanhoe Electric
IE
$1.45B
| $72K | ﹤0.01% |
+7,218
| New | +$76.3K |
|
5716
Envista
NVST
$4.44B
| $72K | ﹤0.01% |
3,030
+1,868
| +161% | +$44.6K |
|
5717
PUT
Pembina Pipeline
PBA
$28.4B
| $72K | ﹤0.01% |
2,100
-15,800
| -88% | -$506K |
|
5718
PUT
Palomar
PLMR
$3.55B
| $72K | ﹤0.01% |
1,300
-6,300
| -83% | -$352K |
|
|
TIXT
5719
DELISTED
TELUS International
TIXT
| $72K | ﹤0.01% |
8,434
+4,811
| +133% | +$35K |
|
|
EGLE
5720
CALL
DELISTED
Eagle Bulk Shipping Inc.
EGLE
| $72K | ﹤0.01% |
1,300
-200
| -13% | -$9.03K |
|
5721
PUT
American Financial Group
AFG
$11.8B
| $71K | ﹤0.01% |
600
-1,900
| -76% | -$214K |
|
5722
PUT
Ardagh Metal Packaging
AMBP
$2.83B
| $71K | ﹤0.01% |
18,700
-8,900
| -32% | -$31K |
|
5723
Alpha and Omega Semiconductor
AOSL
$950M
| $71K | ﹤0.01% |
2,761
+2,492
| +926% | +$61.5K |
|
5724
PUT
Consolidated Water Co
CWCO
$467M
| $71K | ﹤0.01% |
2,000
+300
| +18% | +$9.89K |
|
5725
Evergy
EVRG
$19.1B
| $71K | ﹤0.01% |
+1,378
| New | +$69.4K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.