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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
HTO
7026
PUT
H2O America
HTO
$2.66B
| $15K | ﹤0.01% |
300
-300
| -50% | -$16K |
|
7027
CALL
Stoneridge
SRI
$210M
| $15K | ﹤0.01% |
2,200
-9,100
| -81% | -$44.6K |
|
|
TRON
7028
PUT
Tron Inc
TRON
$740M
| $15K | ﹤0.01% |
+11,600
| New | +$20.8K |
|
7029
PUT
Travel + Leisure Co
TNL
$4.68B
| $15K | ﹤0.01% |
300
-100
| -25% | -$4.7K |
|
7030
Toro Company
TTC
$9.01B
| $15K | ﹤0.01% |
+217
| New | +$15.4K |
|
7031
Vista Gold
VGZ
$253M
| $15K | ﹤0.01% |
+16,390
| New | +$16K |
|
7032
PUT
VOC Energy
VOC
$57M
| $15K | ﹤0.01% |
5,500
+200
| +4% | +$590 |
|
7033
Cactus
WHD
$3.74B
| $15K | ﹤0.01% |
352
+256
| +267% | +$10.7K |
|
7034
CALL
Wrap Technologies
WRAP
$99.8M
| $15K | ﹤0.01% |
10,200
+7,300
| +252% | +$11K |
|
7035
PUT
Ziff Davis
ZD
$1.93B
| $15K | ﹤0.01% |
500
-500
| -50% | -$16.1K |
|
|
ZH
7036
CALL
Zhihu
ZH
$279M
| $15K | ﹤0.01% |
3,900
-41,200
| -91% | -$160K |
|
7037
CALL
ReWalk Robotics
LFWD
$20M
| $15K | ﹤0.01% |
2,000
-100
| -5% | -$1.53K |
|
7038
Metallus
MTUS
$869M
| $15K | ﹤0.01% |
+992
| New | +$13.2K |
|
7039
CALL
Hafnia
HAFN
$3.73B
| $15K | ﹤0.01% |
3,100
-500
| -14% | -$2.43K |
|
|
INVX
7040
PUT
Innovex International
INVX
$1.85B
| $15K | ﹤0.01% |
1,000
| – | – |
|
7041
PUT
ABM Industries
ABM
$2.84B
| $14K | ﹤0.01% |
300
+200
| +200% | +$9.67K |
|
7042
PUT
Aldeyra Therapeutics
ALDX
$95.3M
| $14K | ﹤0.01% |
3,900
-12,100
| -76% | -$31.3K |
|
7043
PUT
Allegion
ALLE
$13.4B
| $14K | ﹤0.01% |
+100
| New | +$13.7K |
|
7044
PUT
American Homes 4 Rent
AMH
$12B
| $14K | ﹤0.01% |
400
+300
| +300% | +$11.1K |
|
|
BHR
7045
Braemar Hotels & Resorts
BHR
$157M
| $14K | ﹤0.01% |
6,038
-24,586
| -80% | -$53.9K |
|
7046
Brady Corp
BRC
$4.54B
| $14K | ﹤0.01% |
+206
| New | +$14.3K |
|
7047
PUT
BlueLinx
BXC
$453M
| $14K | ﹤0.01% |
+200
| New | +$14K |
|
7048
Century Casinos
CNTY
$32.6M
| $14K | ﹤0.01% |
6,720
+5,872
| +692% | +$10.5K |
|
7049
California Water Service
CWT
$3.04B
| $14K | ﹤0.01% |
318
+240
| +308% | +$11.5K |
|
7050
PUT
Dolby
DLB
$4.85B
| $14K | ﹤0.01% |
+200
| New | +$15K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.