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 | |
|---|---|---|---|---|---|---|
5551
PUT
Columbia Banking Systems
COLB
$8.84B
| $62K | ﹤0.01% |
2,500
-800
| -24% | -$21.3K |
|
5552
CALL
Danaos Corp
DAC
$2.58B
| $62K | ﹤0.01% |
800
+200
| +33% | +$16K |
|
|
DHC
5553
CALL
Diversified Healthcare Trust
DHC
$2.15B
| $62K | ﹤0.01% |
25,900
-28,700
| -53% | -$70.8K |
|
5554
CALL
Eton Pharmaceutcials
ETON
$1.27B
| $62K | ﹤0.01% |
4,800
-1,000
| -17% | -$15.1K |
|
5555
PUT
Heritage Insurance Holdings
HRTG
$889M
| $62K | ﹤0.01% |
4,300
-6,700
| -61% | -$80.5K |
|
5556
James River Group Holdings
JRVR
$208M
| $62K | ﹤0.01% |
14,933
+11,284
| +309% | +$51.2K |
|
|
MTLS
5557
Materialise
MTLS
$368M
| $62K | ﹤0.01% |
12,646
+8,679
| +219% | +$59.6K |
|
5558
PUT
Qualys
QLYS
$5.1B
| $62K | ﹤0.01% |
+500
| New | +$67.6K |
|
|
SPTN
5559
PUT
DELISTED
SpartanNash
SPTN
| $62K | ﹤0.01% |
3,100
+1,800
| +138% | +$34.5K |
|
5560
United Bankshares
UBSI
$6.63B
| $62K | ﹤0.01% |
+1,809
| New | +$66.3K |
|
5561
PUT
Veracyte
VCYT
$3.7B
| $62K | ﹤0.01% |
2,100
+2,000
| +2,000% | +$76.2K |
|
5562
WEX
WEX
$6.37B
| $62K | ﹤0.01% |
400
+398
| +19,900% | +$65.5K |
|
5563
CALL
Wipro
WIT
$19.6B
| $62K | ﹤0.01% |
20,300
+19,500
| +2,438% | +$66.5K |
|
5564
PUT
Westlake Chemical Partners
WLKP
$763M
| $62K | ﹤0.01% |
2,700
+400
| +17% | +$9.52K |
|
5565
CALL
Unusual Machines
UMAC
$1.01B
| $62K | ﹤0.01% |
+9,700
| New | +$98.3K |
|
|
NKLA
5566
CALL
DELISTED
Nikola Corporation Common Stock
NKLA
| $62K | ﹤0.01% |
493,400
-259,000
| -34% | -$227K |
|
5567
Apple Hospitality REIT
APLE
$3.9B
| $61K | ﹤0.01% |
+4,793
| New | +$70K |
|
|
SRTA
5568
PUT
Strata Critical Medical Inc
SRTA
$434M
| $61K | ﹤0.01% |
22,700
+19,300
| +568% | +$69.2K |
|
5569
PUT
Essex Property Trust
ESS
$18.3B
| $61K | ﹤0.01% |
+200
| New | +$58.4K |
|
5570
CALL
Gildan
GIL
$10.3B
| $61K | ﹤0.01% |
1,400
-3,900
| -74% | -$194K |
|
5571
Gray Television
GTN
$415M
| $61K | ﹤0.01% |
14,325
-6,290
| -31% | -$24.7K |
|
5572
PUT
iShares iBonds 2030 Term High Yield and Income ETF
IBHJ
$151M
| $61K | ﹤0.01% |
7,500
-700
| -9% | -$18.4K |
|
5573
Ormat Technologies
ORA
$6B
| $61K | ﹤0.01% |
+871
| New | +$59K |
|
5574
CALL
PAR Technology
PAR
$699M
| $61K | ﹤0.01% |
1,000
-10,300
| -91% | -$691K |
|
5575
Perma-Fix Environmental Services
PESI
$352M
| $61K | ﹤0.01% |
+8,419
| New | +$75.6K |
|
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.