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 | |
|---|---|---|---|---|---|---|
3126
CALL
Alignment Healthcare
ALHC
$3.92B
| $728K | ﹤0.01% |
52,000
+50,000
| +2,500% | +$805K |
|
3127
PUT
Bentley Systems
BSY
$10.3B
| $728K | ﹤0.01% |
+13,500
| New | +$625K |
|
|
VNET
3128
PUT
VNET Group
VNET
$2.02B
| $728K | ﹤0.01% |
105,600
-106,400
| -50% | -$637K |
|
3129
PUT
Iridium Communications
IRDM
$4.84B
| $727K | ﹤0.01% |
24,100
-5,500
| -19% | -$143K |
|
|
HDSN
3130
Hudson Technologies
HDSN
$265M
| $726K | ﹤0.01% |
+89,430
| New | +$613K |
|
3131
CALL
Kodak
KODK
$782M
| $725K | ﹤0.01% |
128,400
+5,900
| +5% | +$35.5K |
|
3132
CALL
Trupanion
TRUP
$1.09B
| $725K | ﹤0.01% |
13,100
+4,100
| +46% | +$182K |
|
|
FFAI
3133
Faraday Future Intelligent Electric
FFAI
$13.2M
| $722K | ﹤0.01% |
2,866
+1,940
| +210% | +$356K |
|
|
OPRA
3134
CALL
Opera Ltd
OPRA
$1.7B
| $721K | ﹤0.01% |
38,200
+11,900
| +45% | +$204K |
|
3135
Intellia Therapeutics
NTLA
$1.51B
| $720K | ﹤0.01% |
76,777
-64,490
| -46% | -$530K |
|
3136
Cognizant
CTSH
$22.6B
| $719K | ﹤0.01% |
+9,225
| New | +$707K |
|
3137
CALL
Iovance Biotherapeutics
IOVA
$2.22B
| $718K | ﹤0.01% |
418,000
-52,800
| -11% | -$131K |
|
3138
CALL
First Industrial Realty Trust
FR
$8.8B
| $717K | ﹤0.01% |
+14,900
| New | +$726K |
|
3139
Patterson-UTI
PTEN
$3.65B
| $717K | ﹤0.01% |
121,058
-70,329
| -37% | -$423K |
|
3140
Full Truck Alliance
YMM
$9.62B
| $717K | ﹤0.01% |
60,787
-31,042
| -34% | -$361K |
|
3141
Adient
ADNT
$1.61B
| $716K | ﹤0.01% |
+36,830
| New | +$544K |
|
3142
CALL
Fidelity Enhanced Large Cap Core ETF
FELC
$7.85B
| $716K | ﹤0.01% |
12,300
+8,700
| +242% | +$277K |
|
3143
PAR Technology
PAR
$683M
| $716K | ﹤0.01% |
10,329
+934
| +10% | +$58.4K |
|
3144
PUT
Heritage Financial
HFWA
$1.23B
| $715K | ﹤0.01% |
+30,000
| New | +$691K |
|
3145
CALL
Opko Health
OPK
$929M
| $715K | ﹤0.01% |
542,100
-99,800
| -16% | -$136K |
|
|
SPTN
3146
PUT
DELISTED
SpartanNash
SPTN
| $715K | ﹤0.01% |
27,000
+23,900
| +771% | +$478K |
|
3147
CALL
Commault Systems
CVLT
$6.16B
| $714K | ﹤0.01% |
4,100
-7,300
| -64% | -$1.25M |
|
3148
Evercore
EVR
$13B
| $713K | ﹤0.01% |
2,641
+2,222
| +530% | +$489K |
|
|
GRMN
3149
Garmin
GRMN
$46.5B
| $713K | ﹤0.01% |
3,417
+2,913
| +578% | +$578K |
|
|
TEN
3150
CALL
Tsakos Energy Navigation Ltd
TEN
$1.17B
| $710K | ﹤0.01% |
37,000
-3,500
| -9% | -$61.4K |
|
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.