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 | |
|---|---|---|---|---|---|---|
1101
PUT
T. Rowe Price
TROW
$24.6B
| $8.99M | 0.01% |
79,500
-40,000
| -33% | -$4.63M |
|
1102
T-Mobile US
TMUS
$183B
| $8.98M | 0.01% |
+40,705
| New | +$9.26M |
|
1103
PUT
BJs Wholesale Club
BJ
$11.7B
| $8.96M | 0.01% |
100,300
+57,600
| +135% | +$5.21M |
|
|
UCD
1104
CALL
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $8.94M | 0.01% |
207,500
-55,600
| -21% | -$2.4M |
|
1105
Rivian
RIVN
$23.8B
| $8.89M | 0.01% |
668,270
-33,637
| -5% | -$387K |
|
1106
PUT
Cognizant
CTSH
$20.3B
| $8.87M | 0.01% |
115,300
+25,600
| +29% | +$2M |
|
1107
CALL
Kyndryl
KD
$2.57B
| $8.81M | ﹤0.01% |
254,600
+61,800
| +32% | +$1.8M |
|
1108
CALL
RUM Group Inc
RUM
$1.65B
| $8.81M | ﹤0.01% |
677,100
+261,100
| +63% | +$1.86M |
|
1109
Honeywell
HON
$78B
| $8.8M | ﹤0.01% |
41,355
+38,713
| +1,465% | +$8.07M |
|
1110
CALL
VeriSign
VRSN
$23.8B
| $8.79M | ﹤0.01% |
42,500
-18,600
| -30% | -$3.5M |
|
1111
CALL
Nutrien
NTR
$32.9B
| $8.79M | ﹤0.01% |
196,500
-4,100
| -2% | -$195K |
|
1112
CALL
ArcelorMittal
MT
$49.9B
| $8.77M | ﹤0.01% |
379,300
+151,100
| +66% | +$3.73M |
|
1113
PUT
Ollie's Bargain Outlet
OLLI
$3.94B
| $8.77M | ﹤0.01% |
79,900
+55,300
| +225% | +$5.5M |
|
1114
ExxonMobil
XOM
$650B
| $8.76M | ﹤0.01% |
+81,429
| New | +$9.53M |
|
|
XYZ
1115
CALL
Block Inc
XYZ
$45.5B
| $8.75M | ﹤0.01% |
1,491,100
+14,500
| +1% | +$1.19M |
|
1116
CALL
XPO
XPO
$25.1B
| $8.75M | ﹤0.01% |
66,700
-6,300
| -9% | -$851K |
|
1117
CALL
QuantumScape Corp
QS
$3.15B
| $8.72M | ﹤0.01% |
1,680,300
+719,000
| +75% | +$3.77M |
|
1118
CALL
Invesco S&P SmallCap Low Volatility ETF
XSLV
$246M
| $8.7M | ﹤0.01% |
247,000
-45,600
| -16% | -$2.23M |
|
1119
CALL
SolarEdge
SEDG
$2.75B
| $8.66M | ﹤0.01% |
636,800
+182,600
| +40% | +$2.81M |
|
1120
CALL
Duolingo
DUOL
$5.62B
| $8.66M | ﹤0.01% |
26,700
-27,700
| -51% | -$8.82M |
|
1121
PUT
Aptiv
APTV
$11.9B
| $8.64M | ﹤0.01% |
142,800
-62,400
| -30% | -$3.82M |
|
1122
CALL
Vanguard Dividend Appreciation ETF
VIG
$110B
| $8.64M | ﹤0.01% |
44,100
+20,600
| +88% | +$4.11M |
|
1123
SoFi Technologies
SOFI
$21.4B
| $8.61M | ﹤0.01% |
558,783
-698,996
| -56% | -$9.08M |
|
1124
CALL
Ally Financial
ALLY
$13.4B
| $8.6M | ﹤0.01% |
238,800
-72,100
| -23% | -$2.62M |
|
1125
PUT
Enbridge
ENB
$123B
| $8.6M | ﹤0.01% |
202,600
-8,700
| -4% | -$364K |
|
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.