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 | |
|---|---|---|---|---|---|---|
1126
PUT
Molson Coors Class B
TAP
$7.51B
| $6.92M | ﹤0.01% |
143,900
+124,900
| +657% | +$6.88M |
|
1127
CALL
Tyson Foods
TSN
$20B
| $6.9M | ﹤0.01% |
123,400
+22,300
| +22% | +$1.28M |
|
1128
CALL
AMC Entertainment Holdings
AMC
$2.04B
| $6.89M | ﹤0.01% |
2,222,800
-1,574,200
| -41% | -$4.67M |
|
1129
CALL
IQVIA
IQV
$34.6B
| $6.86M | ﹤0.01% |
43,500
+37,400
| +613% | +$5.63M |
|
|
1130
PUT
IQVIA
IQV
$34.6B
| $6.84M | ﹤0.01% |
43,400
+8,300
| +24% | +$1.25M |
|
1131
CALL
SLM Corp
SLM
$4.56B
| $6.83M | ﹤0.01% |
208,300
+142,100
| +215% | +$4.35M |
|
1132
PUT
HEICO Corp Class A
HEI.A
$34.8B
| $6.82M | ﹤0.01% |
20,800
+17,600
| +550% | +$3.85M |
|
1133
CALL
Ally Financial
ALLY
$13.4B
| $6.8M | ﹤0.01% |
174,700
-88,300
| -34% | -$3.06M |
|
1134
Snap
SNAP
$7.42B
| $6.8M | ﹤0.01% |
782,837
-351,596
| -31% | -$2.92M |
|
1135
Johnson & Johnson
JNJ
$624B
| $6.79M | ﹤0.01% |
+44,482
| New | +$6.84M |
|
1136
PUT
Exelon
EXC
$48.4B
| $6.79M | ﹤0.01% |
156,400
+101,000
| +182% | +$4.5M |
|
1137
CALL
Cinemark Holdings
CNK
$3.82B
| $6.76M | ﹤0.01% |
224,000
-115,800
| -34% | -$3.5M |
|
1138
PUT
Starwood Property Trust
STWD
$6.05B
| $6.75M | ﹤0.01% |
336,600
+207,700
| +161% | +$4.04M |
|
1139
PUT
Rambus
RMBS
$11.2B
| $6.75M | ﹤0.01% |
105,500
+102,700
| +3,668% | +$5.5M |
|
1140
PUT
McKesson
MCK
$96.5B
| $6.74M | ﹤0.01% |
9,200
-29,700
| -76% | -$21M |
|
1141
CALL
Antero Resources
AR
$10.9B
| $6.73M | ﹤0.01% |
167,200
-167,600
| -50% | -$6.35M |
|
1142
PUT
Lattice Semiconductor
LSCC
$18.9B
| $6.69M | ﹤0.01% |
136,600
+110,600
| +425% | +$5.29M |
|
1143
CALL
Tencent Music
TME
$14.3B
| $6.69M | ﹤0.01% |
343,300
+131,000
| +62% | +$2.06M |
|
1144
PUT
Regency Centers
REG
$14.9B
| $6.67M | ﹤0.01% |
93,700
-1,200
| -1% | -$85.8K |
|
1145
PUT
Steel Dynamics
STLD
$34.7B
| $6.67M | ﹤0.01% |
52,100
+200
| +0.4% | +$25.5K |
|
1146
CALL
United States Natural Gas Fund
UNG
$473M
| $6.66M | ﹤0.01% |
435,700
+130,300
| +43% | +$2.25M |
|
1147
PUT
iShares Convertible Bond ETF
ICVT
$7.37B
| $6.64M | ﹤0.01% |
173,200
+78,900
| +84% | +$6.76M |
|
1148
PUT
Cardinal Health
CAH
$52.9B
| $6.64M | ﹤0.01% |
39,500
-111,400
| -74% | -$16.5M |
|
1149
PUT
Travelers Companies
TRV
$78.5B
| $6.63M | ﹤0.01% |
24,800
-1,700
| -6% | -$448K |
|
1150
ON Semiconductor
ON
$35.1B
| $6.63M | ﹤0.01% |
126,513
+116,965
| +1,225% | +$5.08M |
|
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.