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 | |
|---|---|---|---|---|---|---|
7151
Apyx Medical
APYX
$164M
| $12K | ﹤0.01% |
5,669
+3,094
| +120% | +$4.36K |
|
7152
Amtech Systems
ASYS
$269M
| $12K | ﹤0.01% |
2,838
-630
| -18% | -$2.46K |
|
7153
Atlanta Braves Holdings Series A
BATRA
$3.53B
| $12K | ﹤0.01% |
263
+257
| +4,283% | +$11.4K |
|
|
SRTA
7154
CALL
Strata Critical Medical Inc
SRTA
$445M
| $12K | ﹤0.01% |
3,200
-1,400
| -30% | -$4.56K |
|
7155
PUT
BioLife Solutions
BLFS
$1.46B
| $12K | ﹤0.01% |
+600
| New | +$13.5K |
|
|
BZUN
7156
CALL
Baozun
BZUN
$164M
| $12K | ﹤0.01% |
5,000
-64,300
| -93% | -$178K |
|
7157
CALL
Perspective Therapeutics
CATX
$322M
| $12K | ﹤0.01% |
3,600
-17,100
| -83% | -$45.1K |
|
7158
PUT
City Holding Co
CHCO
$2.03B
| $12K | ﹤0.01% |
100
| – | – |
|
7159
CALL
Costamare
CMRE
$1.89B
| $12K | ﹤0.01% |
24,300
-16,700
| -41% | -$149K |
|
7160
Traeger
COOK
$170M
| $12K | ﹤0.01% |
148
-28
| -16% | -$2.15K |
|
7161
Invesco MSCI Global Timber ETF
CUT
$32.4M
| $12K | ﹤0.01% |
427
+243
| +132% | +$7.29K |
|
7162
Commercial Vehicle Group
CVGI
$154M
| $12K | ﹤0.01% |
7,380
+2,002
| +37% | +$2.43K |
|
7163
PUT
CVRx
CVRX
$129M
| $12K | ﹤0.01% |
2,200
+1,100
| +100% | +$7.59K |
|
7164
8x8 Inc
EGHT
$262M
| $12K | ﹤0.01% |
6,376
+6,138
| +2,579% | +$10.8K |
|
7165
PUT
Future Fuel
FF
$203M
| $12K | ﹤0.01% |
3,100
-1,500
| -33% | -$6.03K |
|
7166
Full House Resorts
FLL
$84.5M
| $12K | ﹤0.01% |
+3,546
| New | +$11.9K |
|
7167
CALL
Flux Power
FLUX
$13.4M
| $12K | ﹤0.01% |
8,400
-400
| -5% | -$650 |
|
|
GAU
7168
CALL
Galiano Gold
GAU
$478M
| $12K | ﹤0.01% |
9,500
-35,500
| -79% | -$48.3K |
|
7169
Green Brick Partners
GRBK
$3.12B
| $12K | ﹤0.01% |
203
-3,008
| -94% | -$178K |
|
7170
PUT
HighPeak Energy
HPK
$855M
| $12K | ﹤0.01% |
1,300
-5,800
| -82% | -$57.2K |
|
7171
PUT
Heartland Express
HTLD
$1.06B
| $12K | ﹤0.01% |
1,400
-10,200
| -88% | -$87.4K |
|
7172
CALL
Immunocore
IMCR
$1.72B
| $12K | ﹤0.01% |
400
-300
| -43% | -$9.32K |
|
7173
PUT
Ingles Markets
IMKTA
$1.67B
| $12K | ﹤0.01% |
200
-26,300
| -99% | -$1.63M |
|
7174
Direxion Daily MSCI India Bull 2X ETF
INDL
$55.1M
| $12K | ﹤0.01% |
+197
| New | +$11.6K |
|
|
HYFT
7175
CALL
MindWalk Holdings
HYFT
$67.3M
| $12K | ﹤0.01% |
11,700
-16,600
| -59% | -$9.5K |
|
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.