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 | |
|---|---|---|---|---|---|---|
6101
PUT
VTEX
VTEX
$767M
| $49K | ﹤0.01% |
7,200
-1,000
| -12% | -$6.1K |
|
|
CMBT
6102
CMB.TECH NV
CMBT
$4.52B
| $49K | ﹤0.01% |
2,791
+2,757
| +8,109% | +$48.8K |
|
|
TXNM
6103
PUT
TXNM Energy Inc
TXNM
$6.39B
| $49K | ﹤0.01% |
1,200
+800
| +200% | +$34.3K |
|
|
PTVE
6104
DELISTED
Pactiv Evergreen Inc. Common stock
PTVE
| $49K | ﹤0.01% |
+3,592
| New | +$37.8K |
|
|
CHUY
6105
CALL
DELISTED
Chuy's Holdings, Inc. Common Stock
CHUY
| $49K | ﹤0.01% |
1,300
| – | – |
|
|
CMLS
6106
DELISTED
Cumulus Media Inc. Class A Common Stock
CMLS
| $49K | ﹤0.01% |
9,330
-6,782
| -42% | -$34.3K |
|
|
ENV
6107
DELISTED
ENVESTNET, INC.
ENV
| $49K | ﹤0.01% |
991
+781
| +372% | +$31.9K |
|
6108
PUT
Alto Ingredients
ALTO
$338M
| $48K | ﹤0.01% |
18,200
-31,100
| -63% | -$99K |
|
6109
CALL
Apyx Medical
APYX
$162M
| $48K | ﹤0.01% |
18,600
-2,400
| -11% | -$5.81K |
|
6110
Accuray
ARAY
$27.5M
| $48K | ﹤0.01% |
+17,105
| New | +$46.7K |
|
6111
CALL
Bioventus
BVS
$889M
| $48K | ﹤0.01% |
9,200
+2,900
| +46% | +$11.5K |
|
6112
PUT
Globe Life
GL
$14B
| $48K | ﹤0.01% |
+400
| New | +$47K |
|
6113
CALL
Hancock Whitney
HWC
$6.19B
| $48K | ﹤0.01% |
+1,000
| New | +$40K |
|
|
MOFG
6114
PUT
DELISTED
MidWestOne Financial Group
MOFG
| $48K | ﹤0.01% |
+1,800
| New | +$39.9K |
|
6115
PUT
PennantPark Floating Rate Capital
PFLT
$698M
| $48K | ﹤0.01% |
4,000
+2,600
| +186% | +$28.4K |
|
|
SOHU
6116
CALL
Sohu.com
SOHU
$352M
| $48K | ﹤0.01% |
4,900
+2,000
| +69% | +$17.9K |
|
6117
PUT
Telecom Argentina
TEO
$5.84B
| $48K | ﹤0.01% |
+6,800
| New | +$43.6K |
|
6118
ProShares VIX Short-Term Futures ETF
VIXY
$221M
| $48K | ﹤0.01% |
782
-1,382
| -64% | -$111K |
|
|
GGRP
6119
Glimpse Group
GGRP
$19.5M
| $48K | ﹤0.01% |
43,242
+21,460
| +99% | +$25.9K |
|
|
WPRT
6120
Westport Fuel Systems
WPRT
$31.9M
| $48K | ﹤0.01% |
7,313
+6,953
| +1,931% | +$44K |
|
6121
Achieve Life Sciences
ACHV
$633M
| $47K | ﹤0.01% |
11,560
+11,075
| +2,284% | +$48.2K |
|
6122
CALL
Crane Co
CR
$11.9B
| $47K | ﹤0.01% |
400
+300
| +300% | +$30.2K |
|
6123
CALL
CVRx
CVRX
$131M
| $47K | ﹤0.01% |
1,500
-11,300
| -88% | -$212K |
|
6124
CALL
Definitive Healthcare
DH
$77M
| $47K | ﹤0.01% |
+4,800
| New | +$37.7K |
|
|
GAN
6125
CALL
DELISTED
GAN Ltd
GAN
| $47K | ﹤0.01% |
29,900
-27,000
| -47% | -$36K |
|
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.