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 | |
|---|---|---|---|---|---|---|
5576
PUT
Progress Software
PRGS
$1.66B
| $61K | ﹤0.01% |
+1,200
| New | +$68.7K |
|
5577
CALL
Resideo Technologies
REZI
$5.19B
| $61K | ﹤0.01% |
3,500
+3,200
| +1,067% | +$65.7K |
|
5578
CALL
TFI International
TFII
$11.1B
| $61K | ﹤0.01% |
+800
| New | +$88.5K |
|
5579
CALL
W&T Offshore
WTI
$534M
| $61K | ﹤0.01% |
39,800
+36,000
| +947% | +$59.4K |
|
5580
CALL
Expro Ltd
XPRO
$1.79B
| $61K | ﹤0.01% |
6,200
+6,100
| +6,100% | +$75.2K |
|
5581
PUT
Hafnia
HAFN
$3.84B
| $61K | ﹤0.01% |
+14,700
| New | +$72.8K |
|
|
ACRE
5582
PUT
Ares Commercial Real Estate
ACRE
$236M
| $60K | ﹤0.01% |
13,100
+7,300
| +126% | +$38.6K |
|
5583
PUT
Amylyx Pharmaceuticals
AMLX
$2.26B
| $60K | ﹤0.01% |
17,200
-2,200
| -11% | -$7.83K |
|
5584
Blend Labs
BLND
$431M
| $60K | ﹤0.01% |
+18,158
| New | +$66K |
|
|
CGAU
5585
Centerra Gold
CGAU
$3.36B
| $60K | ﹤0.01% |
9,497
-11,486
| -55% | -$70.2K |
|
5586
CALL
Fortress Biotech
FBIO
$104M
| $60K | ﹤0.01% |
38,800
-8,100
| -17% | -$14.3K |
|
5587
PUT
Imperial Petroleum
IMPP
$213M
| $60K | ﹤0.01% |
24,700
+2,200
| +10% | +$6.1K |
|
5588
CALL
Indivior Pharmaceuticals
INDV
$4.73B
| $60K | ﹤0.01% |
6,400
+6,000
| +1,500% | +$63.1K |
|
5589
CALL
Medallion Financial
MFIN
$229M
| $60K | ﹤0.01% |
6,900
-12,100
| -64% | -$107K |
|
5590
Steven Madden
SHOO
$3.37B
| $60K | ﹤0.01% |
+2,267
| New | +$79.8K |
|
5591
CALL
Stereotaxis
STXS
$126M
| $60K | ﹤0.01% |
34,300
+20,300
| +145% | +$43.2K |
|
|
TRUE
5592
DELISTED
TrueCar
TRUE
| $60K | ﹤0.01% |
38,580
+10,741
| +39% | +$29.8K |
|
|
TBRG
5593
PUT
DELISTED
TruBridge
TBRG
| $60K | ﹤0.01% |
+2,200
| New | +$57.3K |
|
|
MRX
5594
PUT
Marex Group Limited Ordinary Shares
MRX
$4.67B
| $60K | ﹤0.01% |
1,700
-100
| -6% | -$3.48K |
|
|
VFLQ
5595
CALL
DELISTED
Vanguard U.S. Liquidity Factor ETF
VFLQ
| $60K | ﹤0.01% |
+400
| New | +$60K |
|
5596
CALL
Allot
ALLT
$372M
| $59K | ﹤0.01% |
+10,500
| New | +$73.5K |
|
|
OPTU
5597
PUT
Optimum Communications Inc
OPTU
$298M
| $59K | ﹤0.01% |
22,300
-96,200
| -81% | -$260K |
|
5598
Charles River Laboratories
CRL
$11.2B
| $59K | ﹤0.01% |
394
-1,625
| -80% | -$272K |
|
5599
CALL
Highwoods Properties
HIW
$3.65B
| $59K | ﹤0.01% |
2,000
+1,000
| +100% | +$29.2K |
|
|
LSEA
5600
CALL
DELISTED
Landsea Homes
LSEA
| $59K | ﹤0.01% |
9,300
| – | – |
|
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.