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 | |
|---|---|---|---|---|---|---|
|
HDSN
5376
CALL
Hudson Technologies
HDSN
$254M
| $75K | ﹤0.01% |
12,300
+100
| +0.8% | +$588 |
|
5377
CALL
Janux Therapeutics
JANX
$925M
| $75K | ﹤0.01% |
2,800
-7,500
| -73% | -$283K |
|
5378
PUT
Navitas Semiconductor
NVTS
$2.84B
| $75K | ﹤0.01% |
36,900
+12,000
| +48% | +$34.4K |
|
5379
PUT
Pacific Biosciences
PACB
$435M
| $75K | ﹤0.01% |
63,800
+8,000
| +14% | +$12.3K |
|
5380
PUT
Radware
RDWR
$1.1B
| $75K | ﹤0.01% |
3,500
-700
| -17% | -$15.6K |
|
|
RGLS
5381
CALL
DELISTED
Regulus Therapeutics
RGLS
| $75K | ﹤0.01% |
43,300
+33,000
| +320% | +$43.5K |
|
|
TSVT
5382
CALL
DELISTED
2seventy bio
TSVT
| $75K | ﹤0.01% |
15,300
+13,100
| +595% | +$41.6K |
|
5383
Direxion Daily 7-10 Year Treasury Bull 3X ETF
TYD
$31.6M
| $75K | ﹤0.01% |
+2,959
| New | +$71.6K |
|
|
MAGN
5384
CALL
Magnera Corp
MAGN
$472M
| $75K | ﹤0.01% |
68,700
-17,300
| -20% | -$336K |
|
|
SGI
5385
Somnigroup International
SGI
$13.7B
| $75K | ﹤0.01% |
1,254
-19,398
| -94% | -$1.17M |
|
5386
VanEck Biotech ETF
BBH
$400M
| $74K | ﹤0.01% |
474
+238
| +101% | +$38.6K |
|
5387
CALL
Cabot Corp
CBT
$4.54B
| $74K | ﹤0.01% |
+900
| New | +$77.6K |
|
5388
DXP Enterprises
DXPE
$2.43B
| $74K | ﹤0.01% |
900
-2,405
| -73% | -$222K |
|
5389
PUT
Fox Factory Holding Corp
FOXF
$755M
| $74K | ﹤0.01% |
3,200
+500
| +19% | +$13.4K |
|
5390
PUT
GeoPark
GPRK
$633M
| $74K | ﹤0.01% |
9,200
+7,100
| +338% | +$63.7K |
|
5391
MDU Resources
MDU
$4.17B
| $74K | ﹤0.01% |
4,383
-14,474
| -77% | -$250K |
|
5392
PUT
Opko Health
OPK
$985M
| $74K | ﹤0.01% |
45,000
-518,400
| -92% | -$854K |
|
5393
CALL
Paylocity
PCTY
$7.38B
| $74K | ﹤0.01% |
400
-1,600
| -80% | -$320K |
|
5394
CALL
Rani Therapeutics
RANI
$87M
| $74K | ﹤0.01% |
59,000
+11,100
| +23% | +$16.4K |
|
5395
PUT
SouthState Bank Corp
SSB
$10.2B
| $74K | ﹤0.01% |
800
-200
| -20% | -$19.7K |
|
5396
Vertex
VERX
$2.09B
| $74K | ﹤0.01% |
2,137
+1,101
| +106% | +$50.3K |
|
|
CTEV
5397
PUT
Claritev Corp
CTEV
$387M
| $74K | ﹤0.01% |
3,600
-400
| -10% | -$7.96K |
|
5398
PUT
Century Communities
CCS
$1.91B
| $73K | ﹤0.01% |
+1,100
| New | +$79.6K |
|
5399
Lyft
LYFT
$6.02B
| $73K | ﹤0.01% |
+6,189
| New | +$80.6K |
|
|
PNNT
5400
CALL
Pennant Park Investment Corp
PNNT
$215M
| $73K | ﹤0.01% |
10,500
-24,300
| -70% | -$173K |
|
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.