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 | |
|---|---|---|---|---|---|---|
|
RC
5701
PUT
Ready Capital
RC
$258M
| $53K | ﹤0.01% |
10,600
-5,700
| -35% | -$35.1K |
|
5702
PUT
Rogers Communications
RCI
$18.3B
| $53K | ﹤0.01% |
2,000
+200
| +11% | +$5.65K |
|
5703
SGHC Ltd
SGHC
$7.11B
| $53K | ﹤0.01% |
8,278
+3,294
| +66% | +$23.7K |
|
|
SOHU
5704
CALL
Sohu.com
SOHU
$362M
| $53K | ﹤0.01% |
4,100
-50,600
| -93% | -$679K |
|
5705
CALL
System1
SST
$14.3M
| $53K | ﹤0.01% |
14,000
+7,280
| +108% | +$44.7K |
|
5706
PUT
Tootsie Roll Industries
TR
$2.93B
| $53K | ﹤0.01% |
1,754
+1,648
| +1,555% | +$49.1K |
|
5707
PUT
Utz Brands
UTZ
$1.25B
| $53K | ﹤0.01% |
3,800
+2,600
| +217% | +$35.8K |
|
5708
CoinShares ETF Trust CoinShares Bitcoin Mining ETF
WGMI
$253M
| $53K | ﹤0.01% |
+4,159
| New | +$83.1K |
|
5709
CALL
Workiva
WK
$3.36B
| $53K | ﹤0.01% |
700
-100
| -13% | -$9.44K |
|
5710
CALL
Xenon Pharmaceuticals
XENE
$6.06B
| $53K | ﹤0.01% |
1,600
-4,300
| -73% | -$163K |
|
|
OS
5711
DELISTED
OneStream Inc
OS
| $53K | ﹤0.01% |
+2,493
| New | +$63.9K |
|
5712
Asbury Automotive
ABG
$4.31B
| $52K | ﹤0.01% |
+237
| New | +$61.8K |
|
5713
PUT
Alignment Healthcare
ALHC
$3.07B
| $52K | ﹤0.01% |
2,800
+100
| +4% | +$1.49K |
|
5714
AdvanSix
ASIX
$541M
| $52K | ﹤0.01% |
+2,316
| New | +$64.5K |
|
|
SRTA
5715
Strata Critical Medical Inc
SRTA
$434M
| $52K | ﹤0.01% |
19,113
-21,452
| -53% | -$77K |
|
5716
PUT
Columbia Sportswear
COLM
$3.04B
| $52K | ﹤0.01% |
700
+600
| +600% | +$50.1K |
|
|
CTO
5717
PUT
CTO Realty Growth
CTO
$824M
| $52K | ﹤0.01% |
2,700
-2,400
| -47% | -$46.6K |
|
5718
PUT
Donnelley Financial Solutions
DFIN
$1.18B
| $52K | ﹤0.01% |
+1,200
| New | +$66.5K |
|
5719
PUT
Geron
GERN
$828M
| $52K | ﹤0.01% |
32,800
-108,200
| -77% | -$263K |
|
5720
Acushnet Holdings
GOLF
$5.93B
| $52K | ﹤0.01% |
+765
| New | +$51.9K |
|
5721
CALL
Green Brick Partners
GRBK
$3.04B
| $52K | ﹤0.01% |
900
-7,800
| -90% | -$461K |
|
5722
PUT
The Honest Company
HNST
$402M
| $52K | ﹤0.01% |
11,200
-17,800
| -61% | -$102K |
|
5723
CALL
Itron
ITRI
$4.36B
| $52K | ﹤0.01% |
500
-400
| -44% | -$41.9K |
|
5724
CALL
Liberty Latin America Class C
LILAK
$1.63B
| $52K | ﹤0.01% |
9,460
-1,650
| -15% | -$10K |
|
5725
PUT
MeiraGTx Holdings
MGTX
$1.09B
| $52K | ﹤0.01% |
7,700
+100
| +1% | +$672 |
|
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.