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 | |
|---|---|---|---|---|---|---|
6026
Nerdy
NRDY
$108M
| $53K | ﹤0.01% |
+15,518
| New | +$47.6K |
|
6027
PUT
Insight Enterprises
NSIT
$3.85B
| $53K | ﹤0.01% |
300
+200
| +200% | +$31.1K |
|
|
NTST
6028
CALL
NETSTREIT Corp
NTST
$2.13B
| $53K | ﹤0.01% |
3,000
+2,700
| +900% | +$42.3K |
|
|
OBE
6029
Obsidian Energy
OBE
$656M
| $53K | ﹤0.01% |
7,933
-96,986
| -92% | -$747K |
|
6030
CALL
D-Wave Quantum Inc. Common Stock
QBTS
$5.99B
| $53K | ﹤0.01% |
60,800
+13,000
| +27% | +$11.5K |
|
6031
CALL
Rigetti Computing
RGTI
$4.39B
| $53K | ﹤0.01% |
54,300
-34,600
| -39% | -$39.4K |
|
6032
PUT
SkinHealth Systems
SKIN
$83.4M
| $53K | ﹤0.01% |
17,200
+11,700
| +213% | +$43.9K |
|
|
SUPV
6033
CALL
Grupo Supervielle
SUPV
$823M
| $53K | ﹤0.01% |
13,300
-64,700
| -83% | -$177K |
|
6034
PUT
Vuzix
VUZI
$178M
| $53K | ﹤0.01% |
25,800
+11,800
| +84% | +$32.2K |
|
6035
PUT
Wolverine World Wide
WWW
$1.68B
| $53K | ﹤0.01% |
6,000
-2,600
| -30% | -$22.1K |
|
|
DAY
6036
PUT
DELISTED
Dayforce
DAY
| $53K | ﹤0.01% |
34,800
+33,400
| +2,386% | +$2.28M |
|
|
TBCH
6037
PUT
Turtle Beach Corp
TBCH
$238M
| $53K | ﹤0.01% |
4,900
-43,800
| -90% | -$429K |
|
|
CHUY
6038
PUT
DELISTED
Chuy's Holdings, Inc. Common Stock
CHUY
| $53K | ﹤0.01% |
1,400
+1,000
| +250% | +$35K |
|
6039
PUT
Pathward Financial
CASH
$1.88B
| $52K | ﹤0.01% |
+1,000
| New | +$49.1K |
|
|
DSL
6040
PUT
DoubleLine Income Solutions Fund
DSL
$1.22B
| $52K | ﹤0.01% |
4,300
+1,100
| +34% | +$12.7K |
|
6041
CALL
Emergent Biosolutions
EBS
$379M
| $52K | ﹤0.01% |
21,900
+4,900
| +29% | +$11.5K |
|
|
ESSA
6042
CALL
DELISTED
ESSA Bancorp
ESSA
| $52K | ﹤0.01% |
2,600
-900
| -26% | -$15K |
|
6043
PUT
Fomento Económico Mexicano
FMX
$41.2B
| $52K | ﹤0.01% |
400
-900
| -69% | -$107K |
|
6044
PUT
Intrepid Potash
IPI
$476M
| $52K | ﹤0.01% |
2,200
-300
| -12% | -$6.34K |
|
6045
CALL
KLX Energy Services
KLXE
$43.1M
| $52K | ﹤0.01% |
4,700
-2,400
| -34% | -$24.3K |
|
6046
PUT
LifeMD
LFMD
$176M
| $52K | ﹤0.01% |
6,300
+2,200
| +54% | +$15.8K |
|
6047
CALL
MasterCraft Boat Holdings
MCFT
$596M
| $52K | ﹤0.01% |
2,300
-1,600
| -41% | -$34.4K |
|
6048
PUT
Nordson
NDSN
$16.4B
| $52K | ﹤0.01% |
200
-2,000
| -91% | -$464K |
|
6049
CALL
Ocugen
OCGN
$403M
| $52K | ﹤0.01% |
90,600
-5,200
| -5% | -$2.08K |
|
6050
PUT
QuickLogic
QUIK
$211M
| $52K | ﹤0.01% |
3,800
+2,900
| +322% | +$31.3K |
|
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.