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 | |
|---|---|---|---|---|---|---|
2226
ASP Isotopes
ASPI
$487M
| $1.77M | ﹤0.01% |
240,150
+237,572
| +9,215% | +$1.59M |
|
|
CGC
2227
CALL
Canopy Growth
CGC
$375M
| $1.76M | ﹤0.01% |
1,444,300
+700,200
| +94% | +$931K |
|
|
PONY
2228
CALL
Pony AI Inc
PONY
$3.1B
| $1.76M | ﹤0.01% |
+133,500
| New | +$1.61M |
|
2229
Bath & Body Works
BBWI
$4.01B
| $1.76M | ﹤0.01% |
58,755
+18,731
| +47% | +$548K |
|
2230
CALL
Bank of Montreal
BMO
$125B
| $1.76M | ﹤0.01% |
15,900
-4,000
| -20% | -$403K |
|
2231
CALL
Mercury Insurance
MCY
$5.94B
| $1.76M | ﹤0.01% |
26,100
-15,400
| -37% | -$916K |
|
2232
PUT
NCR Atleos
NATL
$3.52B
| $1.76M | ﹤0.01% |
61,600
+52,400
| +570% | +$1.41M |
|
2233
CALL
ProShares UltraShort Health Care
RXD
$3.25M
| $1.75M | ﹤0.01% |
25,850
-16,500
| -39% | -$403K |
|
2234
PUT
Harmony Gold Mining
HMY
$9.92B
| $1.74M | ﹤0.01% |
124,800
+18,800
| +18% | +$284K |
|
2235
PUT
Huazhu Hotels Group
HTHT
$12.4B
| $1.74M | ﹤0.01% |
51,400
+19,800
| +63% | +$694K |
|
2236
PUT
Uranium Energy
UEC
$4.71B
| $1.74M | ﹤0.01% |
256,300
+188,100
| +276% | +$1.05M |
|
2237
HubSpot
HUBS
$10.5B
| $1.74M | ﹤0.01% |
3,128
+2,364
| +309% | +$1.38M |
|
2238
Merck
MRK
$324B
| $1.74M | ﹤0.01% |
+21,992
| New | +$1.75M |
|
2239
CALL
MasTec
MTZ
$26.7B
| $1.74M | ﹤0.01% |
10,200
+2,200
| +28% | +$317K |
|
2240
CALL
Highwoods Properties
HIW
$3.71B
| $1.74M | ﹤0.01% |
55,900
+53,900
| +2,695% | +$1.59M |
|
2241
PUT
Sysco
SYY
$39.7B
| $1.73M | ﹤0.01% |
22,900
-200
| -0.9% | -$14.5K |
|
2242
CALL
Vista Energy
VIST
$7.75B
| $1.73M | ﹤0.01% |
36,100
+2,800
| +8% | +$133K |
|
2243
CALL
Vital Farms
VITL
$558M
| $1.73M | ﹤0.01% |
44,800
+5,500
| +14% | +$186K |
|
|
HIMX
2244
CALL
Himax Technologies
HIMX
$2.2B
| $1.72M | ﹤0.01% |
193,100
-126,700
| -40% | -$997K |
|
2245
FMC
FMC
$1.42B
| $1.72M | ﹤0.01% |
41,127
+12,921
| +46% | +$513K |
|
2246
PUT
Mistras Group
MG
$492M
| $1.72M | ﹤0.01% |
214,400
+135,700
| +172% | +$1.14M |
|
2247
CALL
Portillo's
PTLO
$315M
| $1.72M | ﹤0.01% |
147,000
+22,000
| +18% | +$254K |
|
2248
PUT
Plug Power
PLUG
$2.92B
| $1.71M | ﹤0.01% |
1,150,900
-523,400
| -31% | -$522K |
|
2249
PUT
W.P. Carey
WPC
$17.1B
| $1.71M | ﹤0.01% |
28,300
-10,900
| -28% | -$671K |
|
2250
CALL
Legend Biotech
LEGN
$4.3B
| $1.71M | ﹤0.01% |
48,200
+34,000
| +239% | +$1.1M |
|
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.