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 | |
|---|---|---|---|---|---|---|
5126
CALL
Ethan Allen Interiors
ETD
$583M
| $111K | ﹤0.01% |
4,000
-2,100
| -34% | -$56.7K |
|
5127
PUT
Fresenius Medical Care
FMS
$13.8B
| $111K | ﹤0.01% |
3,900
+1,300
| +50% | +$34.9K |
|
5128
CALL
Madison Square Garden
MSGE
$3.73B
| $111K | ﹤0.01% |
2,800
+700
| +33% | +$24.7K |
|
|
ORGN
5129
CALL
DELISTED
Origin Materials
ORGN
| $111K | ﹤0.01% |
7,707
+2,054
| +36% | +$34.8K |
|
5130
CALL
POSCO
PKX
$16.5B
| $111K | ﹤0.01% |
2,300
| – | – |
|
|
SCPH
5131
DELISTED
scPharmaceuticals
SCPH
| $111K | ﹤0.01% |
+29,217
| New | +$90.7K |
|
5132
Sprott Gold Miners ETF
SGDM
$563M
| $111K | ﹤0.01% |
2,460
-232
| -9% | -$9.78K |
|
5133
CALL
Brunswick
BC
$5.18B
| $110K | ﹤0.01% |
2,000
-300
| -13% | -$15.2K |
|
5134
PUT
Popular Inc
BPOP
$11.2B
| $110K | ﹤0.01% |
1,000
-12,900
| -93% | -$1.27M |
|
5135
CALL
Brown & Brown
BRO
$23.7B
| $110K | ﹤0.01% |
1,000
-3,100
| -76% | -$348K |
|
|
BTM
5136
PUT
DELISTED
Bitcoin Depot
BTM
| $110K | ﹤0.01% |
+3,100
| New | +$65.9K |
|
|
CTO
5137
PUT
CTO Realty Growth
CTO
$820M
| $110K | ﹤0.01% |
6,400
+3,700
| +137% | +$66.9K |
|
5138
CALL
Encompass Health
EHC
$11B
| $110K | ﹤0.01% |
900
-12,200
| -93% | -$1.39M |
|
5139
CALL
Energizer
ENR
$1.44B
| $110K | ﹤0.01% |
5,500
+1,100
| +25% | +$26.4K |
|
5140
CALL
loanDepot
LDI
$542M
| $110K | ﹤0.01% |
86,800
-12,100
| -12% | -$14.8K |
|
5141
CALL
MGP Ingredients
MGPI
$380M
| $110K | ﹤0.01% |
3,700
-34,800
| -90% | -$1.03M |
|
|
ORLA
5142
PUT
Orla Mining
ORLA
$3.54B
| $110K | ﹤0.01% |
11,000
+10,100
| +1,122% | +$105K |
|
5143
Timken Company
TKR
$9.46B
| $110K | ﹤0.01% |
1,517
+1,360
| +866% | +$92.5K |
|
5144
CALL
UDR
UDR
$12.3B
| $110K | ﹤0.01% |
2,700
+2,500
| +1,250% | +$104K |
|
|
ARDT
5145
CALL
Ardent Health
ARDT
$1.54B
| $110K | ﹤0.01% |
8,100
+7,500
| +1,250% | +$101K |
|
5146
Global X Artificial Intelligence & Technology ETF
AIQ
$9.32B
| $109K | ﹤0.01% |
+2,502
| New | +$97.1K |
|
5147
Digital Turbine
APPS
$990M
| $109K | ﹤0.01% |
18,578
-13,778
| -43% | -$56.6K |
|
5148
CALL
Corvus Pharmaceuticals
CRVS
$1.11B
| $109K | ﹤0.01% |
27,300
-12,100
| -31% | -$44K |
|
5149
CALL
Dine Brands
DIN
$457M
| $109K | ﹤0.01% |
4,500
-1,600
| -26% | -$37K |
|
5150
PUT
International Seaways
INSW
$4.71B
| $109K | ﹤0.01% |
3,000
-400
| -12% | -$14.3K |
|
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.