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 | |
|---|---|---|---|---|---|---|
6326
CALL
Construction Partners
ROAD
$5.88B
| $39K | ﹤0.01% |
900
+800
| +800% | +$32.8K |
|
6327
PUT
Rogers Corp
ROG
$2.09B
| $39K | ﹤0.01% |
300
| – | – |
|
|
ECHO
6328
PUT
EchoStar
ECHO
$24.3B
| $39K | ﹤0.01% |
2,400
-3,000
| -56% | -$38.6K |
|
6329
CALL
Standard Motor Products
SMP
$902M
| $39K | ﹤0.01% |
+1,000
| New | +$35.7K |
|
|
UDMY
6330
CALL
DELISTED
Udemy
UDMY
| $39K | ﹤0.01% |
2,700
+800
| +42% | +$9.96K |
|
6331
US Treasury 10 Year Note ETF
UTEN
$287M
| $39K | ﹤0.01% |
883
+753
| +579% | +$32.6K |
|
|
INVX
6332
PUT
Innovex International
INVX
$1.8B
| $39K | ﹤0.01% |
+1,700
| New | +$39.9K |
|
|
PRFT
6333
CALL
DELISTED
Perficient Inc
PRFT
| $39K | ﹤0.01% |
600
-500
| -45% | -$30.8K |
|
|
DMTK
6334
CALL
DELISTED
DermTech, Inc. Common Stock
DMTK
| $39K | ﹤0.01% |
22,800
-1,700
| -7% | -$2.48K |
|
6335
AdaptHealth
AHCO
$1.47B
| $38K | ﹤0.01% |
5,345
-38,484
| -88% | -$303K |
|
|
EFOR
6336
PUT
Everforth Inc
EFOR
$960M
| $38K | ﹤0.01% |
400
-1,000
| -71% | -$87.3K |
|
|
AZEK
6337
PUT
DELISTED
The AZEK Co
AZEK
| $38K | ﹤0.01% |
1,000
+600
| +150% | +$18.7K |
|
6338
CALL
Smartbird Inc
BIRD
$19.5M
| $38K | ﹤0.01% |
1,555
-755
| -33% | -$14.9K |
|
|
BRY
6339
CALL
DELISTED
Berry Corp
BRY
| $38K | ﹤0.01% |
5,500
-1,800
| -25% | -$13.5K |
|
|
BRY
6340
DELISTED
Berry Corp
BRY
| $38K | ﹤0.01% |
+5,524
| New | +$41.4K |
|
|
CMBM
6341
DELISTED
Cambium Networks
CMBM
| $38K | ﹤0.01% |
6,366
+6,011
| +1,693% | +$29.6K |
|
6342
Global X FinTech ETF
FINX
$170M
| $38K | ﹤0.01% |
1,525
-729
| -32% | -$15.7K |
|
6343
CALL
Holley
HLLY
$335M
| $38K | ﹤0.01% |
8,000
-7,800
| -49% | -$34.4K |
|
6344
PUT
Innodata
INOD
$1.81B
| $38K | ﹤0.01% |
4,700
-11,000
| -70% | -$87.1K |
|
6345
Keros Therapeutics
KROS
$197M
| $38K | ﹤0.01% |
+969
| New | +$30.4K |
|
6346
PUT
Lands' End
LE
$378M
| $38K | ﹤0.01% |
4,000
+3,500
| +700% | +$26K |
|
6347
CALL
Lindsay Corp
LNN
$1.14B
| $38K | ﹤0.01% |
300
-100
| -25% | -$12.3K |
|
6348
CALL
LSI Industries
LYTS
$834M
| $38K | ﹤0.01% |
2,700
+1,900
| +238% | +$26.9K |
|
6349
CALL
Mama's Creations
MAMA
$846M
| $38K | ﹤0.01% |
+7,900
| New | +$31.2K |
|
6350
CALL
Monro
MNRO
$414M
| $38K | ﹤0.01% |
1,300
+800
| +160% | +$22.5K |
|
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.