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 | |
|---|---|---|---|---|---|---|
1826
PUT
Molina Healthcare
MOH
$10.3B
| $3.65M | ﹤0.01% |
10,100
+1,000
| +11% | +$353K |
|
1827
PUT
Ciena
CIEN
$55.3B
| $3.65M | ﹤0.01% |
81,000
+17,400
| +27% | +$767K |
|
1828
CALL
Mattel
MAT
$4.17B
| $3.65M | ﹤0.01% |
193,100
-44,800
| -19% | -$872K |
|
1829
CALL
AGCO
AGCO
$8.78B
| $3.64M | ﹤0.01% |
30,000
+11,500
| +62% | +$1.34M |
|
1830
PUT
United States Natural Gas Fund
UNG
$470M
| $3.64M | ﹤0.01% |
179,600
-98,000
| -35% | -$2.44M |
|
|
NUVL
1831
PUT
DELISTED
Nuvalent
NUVL
| $3.63M | ﹤0.01% |
49,400
-3,100
| -6% | -$192K |
|
|
PPLC
1832
PUT
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $3.63M | ﹤0.01% |
35,200
-334,100
| -90% | -$34.4M |
|
1833
PUT
PACCAR
PCAR
$69.6B
| $3.62M | ﹤0.01% |
37,100
-21,500
| -37% | -$1.93M |
|
1834
PUT
Axcelis
ACLS
$4.12B
| $3.62M | ﹤0.01% |
27,900
+18,800
| +207% | +$2.59M |
|
|
BCPC
1835
CALL
Balchem Corp
BCPC
$5.23B
| $3.61M | ﹤0.01% |
+24,300
| New | +$3.11M |
|
1836
PUT
California Resources
CRC
$4.75B
| $3.61M | ﹤0.01% |
66,000
+13,300
| +25% | +$699K |
|
1837
PUT
PTC
PTC
$13.7B
| $3.6M | ﹤0.01% |
20,600
+7,100
| +53% | +$1.09M |
|
1838
CALL
Weatherford International
WFRD
$6.36B
| $3.59M | ﹤0.01% |
36,700
-600
| -2% | -$55.8K |
|
1839
PUT
First Majestic Silver
AG
$8.05B
| $3.59M | ﹤0.01% |
583,200
+23,700
| +4% | +$131K |
|
1840
PUT
TAL Education Group
TAL
$5.71B
| $3.58M | ﹤0.01% |
283,900
+135,700
| +92% | +$1.41M |
|
|
ARCH
1841
PUT
DELISTED
Arch Resources, Inc.
ARCH
| $3.58M | ﹤0.01% |
21,600
+10,000
| +86% | +$1.57M |
|
|
FOLD
1842
DELISTED
Amicus Therapeutics
FOLD
| $3.58M | ﹤0.01% |
251,989
+220,670
| +705% | +$2.51M |
|
1843
Chewy
CHWY
$8.54B
| $3.57M | ﹤0.01% |
151,125
+115,126
| +320% | +$2.27M |
|
|
SNV
1844
PUT
DELISTED
Synovus
SNV
| $3.57M | ﹤0.01% |
94,800
+27,200
| +40% | +$831K |
|
1845
PUT
Liquidia Corp
LQDA
$7.67B
| $3.56M | ﹤0.01% |
296,400
+264,800
| +838% | +$1.91M |
|
1846
CALL
Mobileye
MBLY
$6.78B
| $3.56M | ﹤0.01% |
82,200
-125,000
| -60% | -$4.92M |
|
1847
Elastic
ESTC
$6.1B
| $3.56M | ﹤0.01% |
+31,583
| New | +$2.81M |
|
1848
CALL
Academy Sports + Outdoors
ASO
$2.89B
| $3.56M | ﹤0.01% |
53,900
+6,000
| +13% | +$304K |
|
|
LSXMA
1849
PUT
DELISTED
Liberty Media Corporation Series A Liberty SiriusXM Common Stock
LSXMA
| $3.54M | ﹤0.01% |
+119,100
| New | +$3.12M |
|
1850
PUT
Frontline
FRO
$8.75B
| $3.54M | ﹤0.01% |
176,500
+127,600
| +261% | +$2.64M |
|
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.