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 | |
|---|---|---|---|---|---|---|
1251
CALL
ICICI Bank
IBN
$106B
| $5.71M | ﹤0.01% |
169,700
+4,900
| +3% | +$162K |
|
1252
PUT
UGI
UGI
$8.01B
| $5.71M | ﹤0.01% |
156,700
-37,400
| -19% | -$1.29M |
|
1253
DraftKings
DKNG
$11.5B
| $5.71M | ﹤0.01% |
133,048
+67,813
| +104% | +$2.43M |
|
1254
PUT
FuboTV Inc
FUBO
$252M
| $5.68M | ﹤0.01% |
122,667
+2,759
| +2% | +$103K |
|
|
BULL
1255
CALL
Webull Corp
BULL
$4.08B
| $5.66M | ﹤0.01% |
+473,600
| New | +$7.34M |
|
1256
CALL
Sweetgreen
SG
$732M
| $5.66M | ﹤0.01% |
380,300
+265,500
| +231% | +$4.38M |
|
1257
PUT
Oneok
OKE
$59.1B
| $5.66M | ﹤0.01% |
69,300
-3,600
| -5% | -$300K |
|
|
BULL
1258
PUT
Webull Corp
BULL
$4.08B
| $5.65M | ﹤0.01% |
+472,500
| New | +$7.32M |
|
1259
CALL
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$3.93B
| $5.64M | ﹤0.01% |
101,700
-60,000
| -37% | -$2.96M |
|
1260
CALL
Carrier Global
CARR
$57.3B
| $5.63M | ﹤0.01% |
77,000
-18,500
| -19% | -$1.26M |
|
1261
PUT
Golar LNG
GLNG
$5B
| $5.62M | ﹤0.01% |
136,400
+90,700
| +198% | +$3.58M |
|
1262
PUT
W.W. Grainger
GWW
$65B
| $5.62M | ﹤0.01% |
5,400
-23,600
| -81% | -$24.5M |
|
1263
PUT
Consolidated Edison
ED
$41.7B
| $5.61M | ﹤0.01% |
55,900
+39,400
| +239% | +$4.17M |
|
1264
CALL
Alcoa
AA
$11.9B
| $5.59M | ﹤0.01% |
189,500
-45,500
| -19% | -$1.23M |
|
1265
CALL
CenterPoint Energy
CNP
$29.1B
| $5.59M | ﹤0.01% |
152,200
+89,900
| +144% | +$3.33M |
|
1266
CALL
Royalty Pharma
RPRX
$26.1B
| $5.58M | ﹤0.01% |
154,900
-28,600
| -16% | -$948K |
|
|
WBA
1267
PUT
DELISTED
Walgreens Boots Alliance
WBA
| $5.58M | ﹤0.01% |
486,000
-368,400
| -43% | -$4.1M |
|
1268
PUT
Tractor Supply
TSCO
$16B
| $5.58M | ﹤0.01% |
105,700
-33,500
| -24% | -$1.71M |
|
1269
PUT
Ulta Beauty
ULTA
$20.5B
| $5.57M | ﹤0.01% |
11,900
-22,000
| -65% | -$9.1M |
|
1270
CALL
Papa John's
PZZA
$1.03B
| $5.55M | ﹤0.01% |
113,500
-83,500
| -42% | -$3.41M |
|
|
SNDK
1271
CALL
Sandisk
SNDK
$222B
| $5.53M | ﹤0.01% |
121,900
+96,100
| +372% | +$3.68M |
|
1272
CALL
DigitalBridge
DBRG
$2.93B
| $5.53M | ﹤0.01% |
533,900
+395,800
| +287% | +$3.78M |
|
1273
CALL
Matador Resources
MTDR
$6.38B
| $5.52M | ﹤0.01% |
115,700
+3,100
| +3% | +$137K |
|
1274
CALL
AeroVironment
AVAV
$7.73B
| $5.5M | ﹤0.01% |
19,300
+9,700
| +101% | +$1.64M |
|
1275
PUT
STMicroelectronics
STM
$47.2B
| $5.49M | ﹤0.01% |
180,400
-25,600
| -12% | -$635K |
|
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.