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 | |
|---|---|---|---|---|---|---|
4151
TMC The Metals Company
TMC
$1.51B
| $234K | ﹤0.01% |
136,354
-74,659
| -35% | -$125K |
|
|
WCN
4152
CALL
Waste Connections
WCN
$43.7B
| $234K | ﹤0.01% |
1,200
+700
| +140% | +$130K |
|
4153
BBB Foods
TBBB
$4.74B
| $234K | ﹤0.01% |
+8,776
| New | +$245K |
|
4154
CALL
Absci
ABSI
$1.17B
| $233K | ﹤0.01% |
93,200
+5,600
| +6% | +$20.5K |
|
4155
PUT
Axogen
AXGN
$2.25B
| $233K | ﹤0.01% |
+12,600
| New | +$227K |
|
4156
B&G Foods
BGS
$303M
| $233K | ﹤0.01% |
34,061
-24,696
| -42% | -$165K |
|
4157
CALL
Churchill Downs
CHDN
$6.19B
| $233K | ﹤0.01% |
2,100
-1,700
| -45% | -$203K |
|
4158
Nektar Therapeutics
NKTR
$2.38B
| $233K | ﹤0.01% |
22,929
+22,084
| +2,613% | +$289K |
|
|
NNDM
4159
CALL
Nano Dimension
NNDM
$316M
| $233K | ﹤0.01% |
146,900
-80,400
| -35% | -$182K |
|
4160
CALL
Rapid7
RPD
$636M
| $233K | ﹤0.01% |
8,800
-23,000
| -72% | -$782K |
|
4161
Televisa
TV
$1.48B
| $233K | ﹤0.01% |
133,218
+31,701
| +31% | +$59.8K |
|
4162
PUT
Adient
ADNT
$1.7B
| $232K | ﹤0.01% |
18,100
-33,200
| -65% | -$534K |
|
4163
American Eagle Outfitters
AEO
$2.94B
| $232K | ﹤0.01% |
20,030
+6,559
| +49% | +$93.7K |
|
4164
CALL
Kirby Corp
KEX
$7.09B
| $232K | ﹤0.01% |
2,300
+1,300
| +130% | +$136K |
|
|
MGIC
4165
DELISTED
Magic Software Enterprises
MGIC
| $232K | ﹤0.01% |
17,907
+16,313
| +1,023% | +$209K |
|
4166
CALL
TPG
TPG
$6.78B
| $232K | ﹤0.01% |
4,900
+2,000
| +69% | +$117K |
|
4167
CALL
Hubbell
HUBB
$24.4B
| $231K | ﹤0.01% |
700
+400
| +133% | +$155K |
|
4168
PUT
CVR Energy
CVI
$3.49B
| $230K | ﹤0.01% |
11,900
-13,700
| -54% | -$268K |
|
4169
CALL
Quantum-Si Incorporated
QSI
$155M
| $230K | ﹤0.01% |
192,400
+44,500
| +30% | +$85.3K |
|
4170
CALL
SiteOne Landscape Supply
SITE
$4.13B
| $230K | ﹤0.01% |
1,900
-100
| -5% | -$13.3K |
|
|
AIOT
4171
PUT
PowerFleet Inc
AIOT
$538M
| $230K | ﹤0.01% |
42,000
+21,700
| +107% | +$139K |
|
4172
PUT
Autoliv
ALV
$9.12B
| $229K | ﹤0.01% |
2,600
-13,200
| -84% | -$1.26M |
|
4173
CALL
iShares Core Dividend ETF
DIVB
$1.71B
| $229K | ﹤0.01% |
7,700
+7,300
| +1,825% | +$358K |
|
4174
Flowserve
FLS
$8.91B
| $229K | ﹤0.01% |
+4,701
| New | +$267K |
|
|
FINV
4175
PUT
FinVolution Group
FINV
$1.18B
| $228K | ﹤0.01% |
23,700
+23,400
| +7,800% | +$192K |
|
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.