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 | |
|---|---|---|---|---|---|---|
1101
PUT
Centene
CNC
$31.5B
| $6.93M | ﹤0.01% |
114,200
-80,200
| -41% | -$4.85M |
|
1102
CALL
Viking Therapeutics
VKTX
$4.11B
| $6.92M | ﹤0.01% |
286,700
-126,800
| -31% | -$4.01M |
|
1103
CALL
AES
AES
$10.6B
| $6.91M | ﹤0.01% |
556,100
-70,500
| -11% | -$816K |
|
1104
PUT
VanEck Durable High Dividend ETF
DURA
$38.4M
| $6.9M | ﹤0.01% |
46,700
-9,800
| -17% | -$327K |
|
1105
PUT
Peloton Interactive
PTON
$2.61B
| $6.89M | ﹤0.01% |
1,091,000
+104,200
| +11% | +$818K |
|
1106
CALL
SolarEdge
SEDG
$2.75B
| $6.89M | ﹤0.01% |
425,600
-211,200
| -33% | -$3.28M |
|
1107
CALL
Peabody Energy
BTU
$2.9B
| $6.88M | ﹤0.01% |
507,700
-72,500
| -12% | -$1.17M |
|
|
GAP
1108
CALL
The Gap Inc
GAP
$6.8B
| $6.87M | ﹤0.01% |
333,400
+41,400
| +14% | +$931K |
|
1109
CALL
AutoZone
AZO
$47.7B
| $6.86M | ﹤0.01% |
1,800
-7,500
| -81% | -$25.9M |
|
1110
PUT
KB Home
KBH
$3.41B
| $6.86M | ﹤0.01% |
118,000
-130,800
| -53% | -$8.33M |
|
1111
PUT
Canadian Pacific Kansas City
CP
$82B
| $6.83M | ﹤0.01% |
97,300
+9,300
| +11% | +$707K |
|
1112
PUT
Align Technology
ALGN
$12B
| $6.8M | ﹤0.01% |
42,800
+2,200
| +5% | +$432K |
|
1113
PUT
SAP
SAP
$171B
| $6.79M | ﹤0.01% |
25,300
-57,300
| -69% | -$15.6M |
|
1114
CALL
Targa Resources
TRGP
$61.3B
| $6.78M | ﹤0.01% |
33,800
-21,700
| -39% | -$4.31M |
|
1115
PUT
Stellantis
STLA
$16.7B
| $6.76M | ﹤0.01% |
603,000
-40,200
| -6% | -$517K |
|
1116
ServiceNow
NOW
$94.8B
| $6.75M | ﹤0.01% |
+42,415
| New | +$8.18M |
|
1117
PUT
Samsara
IOT
$18.3B
| $6.73M | ﹤0.01% |
175,700
-106,300
| -38% | -$4.95M |
|
1118
CALL
Baker Hughes
BKR
$55.6B
| $6.7M | ﹤0.01% |
152,400
-74,000
| -33% | -$3.3M |
|
1119
FirstEnergy
FE
$28.6B
| $6.69M | ﹤0.01% |
165,479
+138,670
| +517% | +$5.52M |
|
1120
CALL
Credo Technology Group
CRDO
$44.1B
| $6.68M | ﹤0.01% |
166,400
+53,500
| +47% | +$3.33M |
|
|
TIGR
1121
UP Fintech Holding
TIGR
$870M
| $6.66M | ﹤0.01% |
775,806
+359,571
| +86% | +$2.69M |
|
1122
PUT
Citizens Financial Group
CFG
$30.3B
| $6.63M | ﹤0.01% |
161,800
+31,800
| +24% | +$1.42M |
|
1123
CALL
United States Natural Gas Fund
UNG
$473M
| $6.6M | ﹤0.01% |
305,400
-95,200
| -24% | -$1.88M |
|
1124
CALL
C.H. Robinson
CHRW
$24.2B
| $6.59M | ﹤0.01% |
64,400
-107,400
| -63% | -$10.9M |
|
1125
CALL
NetEase
NTES
$76.9B
| $6.58M | ﹤0.01% |
63,900
-22,400
| -26% | -$2.25M |
|
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.