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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1176
CALL
Allstate
ALL
$65.5B
| $6.11M | ﹤0.01% |
29,500
+6,300
| +27% | +$1.23M |
|
1177
CALL
Celanese
CE
$5.19B
| $6.11M | ﹤0.01% |
107,600
+60,600
| +129% | +$3.78M |
|
1178
CALL
BJs Wholesale Club
BJ
$11.7B
| $6.07M | ﹤0.01% |
53,200
-14,100
| -21% | -$1.45M |
|
1179
PUT
Aon
AON
$76B
| $6.07M | ﹤0.01% |
15,200
-11,500
| -43% | -$4.41M |
|
1180
CALL
Comstock Resources
CRK
$4.03B
| $6.06M | ﹤0.01% |
298,100
-5,000
| -2% | -$95.8K |
|
1181
CALL
Carrier Global
CARR
$57.4B
| $6.05M | ﹤0.01% |
95,500
-67,300
| -41% | -$4.47M |
|
1182
CALL
Applied Digital
APLD
$8.54B
| $6.04M | ﹤0.01% |
1,075,000
+244,800
| +29% | +$1.92M |
|
1183
CALL
BigBear.ai
BBAI
$1.37B
| $6.03M | ﹤0.01% |
2,109,000
+279,500
| +15% | +$1.33M |
|
1184
CALL
State Street SPDR Portfolio Europe ETF
SPEU
$707M
| $6.02M | ﹤0.01% |
110,600
+64,500
| +140% | +$2.79M |
|
1185
ScottsMiracle-Gro
SMG
$3.93B
| $6.02M | ﹤0.01% |
109,665
+105,820
| +2,752% | +$6.84M |
|
1186
CALL
Vail Resorts
MTN
$5.13B
| $6.02M | ﹤0.01% |
37,600
+21,600
| +135% | +$3.59M |
|
1187
PUT
Canadian National Railway
CNI
$79.2B
| $6.01M | ﹤0.01% |
61,700
+58,300
| +1,715% | +$5.89M |
|
1188
CALL
Bath & Body Works
BBWI
$3.9B
| $6.01M | ﹤0.01% |
198,300
-80,300
| -29% | -$2.84M |
|
1189
CALL
Lemonade
LMND
$4.66B
| $6.01M | ﹤0.01% |
191,100
-233,200
| -55% | -$8.03M |
|
1190
CALL
Pultegroup
PHM
$23.7B
| $5.99M | ﹤0.01% |
58,300
-47,700
| -45% | -$5.15M |
|
1191
CALL
Leidos
LDOS
$13.9B
| $5.92M | ﹤0.01% |
43,900
+25,500
| +139% | +$3.56M |
|
1192
CALL
Incyte
INCY
$23.3B
| $5.92M | ﹤0.01% |
97,800
+56,600
| +137% | +$3.95M |
|
1193
CALL
Onto Innovation
ONTO
$14.5B
| $5.92M | ﹤0.01% |
48,800
+45,900
| +1,583% | +$7.73M |
|
1194
PUT
Crown Castle
CCI
$32.5B
| $5.92M | ﹤0.01% |
56,800
+11,500
| +25% | +$1.07M |
|
1195
PUT
Stanley Black & Decker
SWK
$13.6B
| $5.92M | ﹤0.01% |
77,000
-8,900
| -10% | -$750K |
|
1196
CALL
Keysight
KEYS
$55.6B
| $5.92M | ﹤0.01% |
39,500
+7,400
| +23% | +$1.22M |
|
1197
PUT
Willis Towers Watson
WTW
$27.2B
| $5.91M | ﹤0.01% |
17,500
+16,700
| +2,088% | +$5.44M |
|
1198
PUT
D-Wave Quantum
QBTS
$6.33B
| $5.9M | ﹤0.01% |
776,700
+91,900
| +13% | +$617K |
|
1199
PUT
Dropbox
DBX
$6.63B
| $5.9M | ﹤0.01% |
220,800
+154,600
| +234% | +$4.49M |
|
1200
Western Digital
WDC
$192B
| $5.88M | ﹤0.01% |
145,433
+42,943
| +42% | +$2.04M |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.