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 | |
|---|---|---|---|---|---|---|
1151
CALL
Tractor Supply
TSCO
$15.9B
| $6.62M | ﹤0.01% |
125,400
+43,900
| +54% | +$2.24M |
|
1152
CALL
State Street
STT
$50.6B
| $6.59M | ﹤0.01% |
62,000
+500
| +0.8% | +$46.2K |
|
1153
PUT
Clorox
CLX
$11.3B
| $6.59M | ﹤0.01% |
54,900
+19,400
| +55% | +$2.59M |
|
1154
Bilibili
BILI
$7.32B
| $6.59M | ﹤0.01% |
307,199
+259,106
| +539% | +$4.77M |
|
1155
CALL
Plains GP Holdings
PAGP
$5.25B
| $6.59M | ﹤0.01% |
339,000
+260,600
| +332% | +$4.85M |
|
1156
PUT
APA Corp
APA
$12.9B
| $6.57M | ﹤0.01% |
359,000
+28,500
| +9% | +$494K |
|
1157
CALL
Magnite
MGNI
$2.57B
| $6.56M | ﹤0.01% |
271,900
+22,800
| +9% | +$336K |
|
1158
Fidelity Wise Origin Bitcoin Fund
FBTC
$12B
| $6.56M | ﹤0.01% |
69,771
-49,274
| -41% | -$4.24M |
|
1159
CALL
Honda
HMC
$36.3B
| $6.55M | ﹤0.01% |
227,400
-108,000
| -32% | -$3.15M |
|
1160
PUT
Floor & Decor
FND
$5.73B
| $6.55M | ﹤0.01% |
86,200
-14,500
| -14% | -$1.08M |
|
1161
Direxion Daily 20+ Year Treasury Bull 3X ETF
TMF
$2.22B
| $6.54M | ﹤0.01% |
+166,816
| New | +$6.44M |
|
1162
CALL
Joby Aviation
JOBY
$7.42B
| $6.54M | ﹤0.01% |
619,600
+2,700
| +0.4% | +$19.5K |
|
1163
PUT
Transmedics
TMDX
$2.46B
| $6.53M | ﹤0.01% |
48,700
+4,000
| +9% | +$439K |
|
1164
CALL
Lemonade
LMND
$4.66B
| $6.5M | ﹤0.01% |
148,400
-42,700
| -22% | -$1.42M |
|
1165
CALL
Public Service Enterprise Group
PEG
$39.8B
| $6.5M | ﹤0.01% |
77,200
-13,900
| -15% | -$1.12M |
|
1166
PUT
Cinemark Holdings
CNK
$3.82B
| $6.49M | ﹤0.01% |
215,000
-19,900
| -8% | -$602K |
|
1167
PUT
Nutrien
NTR
$32.9B
| $6.47M | ﹤0.01% |
111,100
+12,900
| +13% | +$729K |
|
1168
PUT
Doximity
DOCS
$3.68B
| $6.46M | ﹤0.01% |
105,300
+12,400
| +13% | +$692K |
|
1169
CALL
Duolingo
DUOL
$5.62B
| $6.44M | ﹤0.01% |
15,700
-800
| -5% | -$351K |
|
1170
CALL
Navitas Semiconductor
NVTS
$2.93B
| $6.41M | ﹤0.01% |
978,400
+735,900
| +303% | +$2.84M |
|
1171
CALL
Scotiabank
BNS
$106B
| $6.41M | ﹤0.01% |
115,900
-20,500
| -15% | -$1.04M |
|
1172
PUT
Range Resources
RRC
$9.08B
| $6.41M | ﹤0.01% |
157,500
+99,100
| +170% | +$3.74M |
|
1173
PUT
O'Reilly Automotive
ORLY
$71.4B
| $6.39M | ﹤0.01% |
70,900
+69,400
| +4,627% | +$6.33M |
|
|
CMA
1174
PUT
DELISTED
Comerica
CMA
| $6.39M | ﹤0.01% |
107,100
+300
| +0.3% | +$16.7K |
|
1175
CALL
Five Below
FIVE
$11.1B
| $6.39M | ﹤0.01% |
48,700
-120,000
| -71% | -$11.7M |
|
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.