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 |
Apple
AAPL
|
+$552M |
| 2 |
Strategy Inc
MSTR
|
+$85.8M |
| 3 |
MSTX
Defiance Daily Target 2x Long MSTR ETF
MSTX
|
+$48.1M |
| 4 |
Intel
INTC
|
+$45.4M |
| 5 |
Uber
UBER
|
+$43M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$133M |
| 2 |
Pinduoduo
PDD
|
+$82.6M |
| 3 |
Boeing
BA
|
+$49.8M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$45.1M |
| 5 |
Microsoft
MSFT
|
+$41M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.68% |
| 2 | Consumer Discretionary | 0.23% |
| 3 | Healthcare | 0.19% |
| 4 | Financials | 0.13% |
| 5 | Communication Services | 0.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1126
PUT
Peloton Interactive
PTON
$2.61B
| $8.59M | ﹤0.01% |
986,800
-806,900
| -45% | -$6.29M |
|
1127
Walt Disney
DIS
$161B
| $8.58M | ﹤0.01% |
77,035
-111,189
| -59% | -$11.7M |
|
1128
PUT
Steel Dynamics
STLD
$34.7B
| $8.57M | ﹤0.01% |
75,100
-114,700
| -60% | -$15.2M |
|
1129
Carvana
CVNA
$43.1B
| $8.56M | ﹤0.01% |
+210,465
| New | +$9.46M |
|
1130
PUT
Fair Isaac
FICO
$28B
| $8.56M | ﹤0.01% |
4,300
-800
| -16% | -$1.71M |
|
1131
PUT
Allstate
ALL
$65.5B
| $8.56M | ﹤0.01% |
44,400
-71,100
| -62% | -$13.8M |
|
1132
CALL
Public Service Enterprise Group
PEG
$39.8B
| $8.56M | ﹤0.01% |
101,300
+48,200
| +91% | +$4.27M |
|
1133
CALL
Alamos Gold
AGI
$12.3B
| $8.52M | ﹤0.01% |
462,200
-108,700
| -19% | -$2.1M |
|
|
TIGR
1134
CALL
UP Fintech Holding
TIGR
$870M
| $8.49M | ﹤0.01% |
1,315,100
+878,900
| +201% | +$6.05M |
|
1135
State Street Materials Select Sector SPDR ETF
XLB
$8.35B
| $8.49M | ﹤0.01% |
+201,750
| New | +$9.34M |
|
1136
Ford
F
$56.4B
| $8.47M | ﹤0.01% |
856,083
+154,437
| +22% | +$1.65M |
|
1137
PUT
Elastic
ESTC
$5.96B
| $8.47M | ﹤0.01% |
85,500
+45,400
| +113% | +$4.2M |
|
1138
PUT
Align Technology
ALGN
$12B
| $8.46M | ﹤0.01% |
40,600
+400
| +1% | +$89.4K |
|
1139
PUT
PennyMac Financial
PFSI
$4.29B
| $8.45M | ﹤0.01% |
82,700
+36,300
| +78% | +$3.8M |
|
1140
PUT
Teck Resources
TECK
$29.4B
| $8.44M | ﹤0.01% |
208,300
-63,800
| -23% | -$2.98M |
|
|
1141
CALL
Steel Dynamics
STLD
$34.7B
| $8.43M | ﹤0.01% |
73,900
-14,600
| -16% | -$1.94M |
|
1142
CALL
ProShares UltraShort Health Care
RXD
$3.3M
| $8.42M | ﹤0.01% |
116,000
+27,550
| +31% | +$585K |
|
1143
PUT
Waste Management
WM
$95.3B
| $8.41M | ﹤0.01% |
41,700
-57,200
| -58% | -$12.3M |
|
1144
PUT
Stellantis
STLA
$16.7B
| $8.39M | ﹤0.01% |
643,200
+32,600
| +5% | +$433K |
|
1145
PUT
Boston Properties
BXP
$10.8B
| $8.38M | ﹤0.01% |
112,700
-10,900
| -9% | -$884K |
|
1146
CALL
KB Home
KBH
$3.41B
| $8.37M | ﹤0.01% |
127,300
-49,300
| -28% | -$3.84M |
|
1147
CALL
Advance Auto Parts
AAP
$3.22B
| $8.36M | ﹤0.01% |
176,700
-54,900
| -24% | -$2.24M |
|
1148
PUT
RUM Group Inc
RUM
$1.65B
| $8.33M | ﹤0.01% |
640,200
+490,500
| +328% | +$3.49M |
|
|
EXE
1149
PUT
Expand Energy Corp
EXE
$21.9B
| $8.31M | ﹤0.01% |
83,500
-2,900
| -3% | -$268K |
|
1150
Li Auto
LI
$12.9B
| $8.29M | ﹤0.01% |
345,796
+194,722
| +129% | +$4.83M |
|
Similar funds
Simplex Trading's Q4 2024 Portfolio in Review
As of Q4 2024, Simplex Trading held 10,008 positions worth $179B, up 4.8% from $170B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading's Q4 2024 filing shows 1,520 new, 3,222 increased, 3,616 reduced and 1,504 closed positions. Its largest new stake was Strategy Inc: 285,022 shares worth $82.5M. The largest sale was NVIDIA, an estimated $133M.
By sector, the portfolio is most concentrated in Technology at 0.68% of assets, up from 0.4% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q4 2024 buy was Strategy Inc: 285,022 shares worth $82.5M.
- Simplex Trading added most to Apple in Q4 2024, an estimated $552M increase.
- Simplex Trading's biggest Q4 2024 reduction was NVIDIA, cutting an estimated $133M.
- Simplex Trading fully exited Pinduoduo in Q4 2024, selling an estimated $82.6M.
- Simplex Trading's ten largest holdings make up 49% of its $179B portfolio in Q4 2024.
- Simplex Trading opened 1,520 new positions and closed 1,504 in Q4 2024.
- Simplex Trading's portfolio value rose 4.8% quarter-over-quarter to $179B.
Based on Simplex Trading's 13F filing for Q4 2024, filed 11 Feb 2025.