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 | |
|---|---|---|---|---|---|---|
|
CRCL
126
PUT
Circle Internet Group
CRCL
$17.7B
| $135M | 0.08% |
+744,700
| New | +$121M |
|
127
PUT
PepsiCo
PEP
$184B
| $135M | 0.08% |
1,019,500
+759,300
| +292% | +$102M |
|
128
PUT
Palo Alto Networks
PANW
$279B
| $134M | 0.08% |
754,500
-213,600
| -22% | -$39.7M |
|
|
129
CALL
Palo Alto Networks
PANW
$279B
| $134M | 0.08% |
655,600
-122,100
| -16% | -$22.7M |
|
130
PUT
ASML
ASML
$692B
| $133M | 0.08% |
165,600
-3,000
| -2% | -$2.15M |
|
131
PUT
Morgan Stanley
MS
$340B
| $132M | 0.08% |
937,800
-156,500
| -14% | -$19.2M |
|
132
CALL
Vertiv
VRT
$117B
| $130M | 0.07% |
1,015,600
+146,500
| +17% | +$14.2M |
|
|
133
CALL
PepsiCo
PEP
$184B
| $129M | 0.07% |
975,300
+205,600
| +27% | +$27.7M |
|
|
134
iShares 20+ Year Treasury Bond ETF
TLT
$42.3B
| $129M | 0.07% |
1,457,996
-1,599,982
| -52% | -$140M |
|
135
Alphabet (Google) Class A
GOOGL
$4.24T
| $126M | 0.07% |
714,528
+168,881
| +31% | +$27.6M |
|
136
CALL
Vistra
VST
$54.7B
| $125M | 0.07% |
647,200
+135,900
| +27% | +$20.1M |
|
137
PUT
iShares MSCI Australia ETF
EWA
$1.34B
| $123M | 0.07% |
3,658,300
+771,800
| +27% | +$19.2M |
|
138
CALL
Verizon
VZ
$183B
| $121M | 0.07% |
2,804,500
+375,100
| +15% | +$16.2M |
|
139
CALL
IBM
IBM
$198B
| $119M | 0.07% |
403,700
+54,900
| +16% | +$14.1M |
|
140
PUT
Qualcomm
QCOM
$183B
| $119M | 0.07% |
746,800
+231,000
| +45% | +$34M |
|
141
PUT
Home Depot
HD
$331B
| $116M | 0.07% |
316,900
+53,800
| +20% | +$19.5M |
|
142
CALL
Reddit
RDDT
$35.8B
| $115M | 0.07% |
762,400
-75,500
| -9% | -$8.56M |
|
143
PUT
Applovin
APP
$144B
| $115M | 0.07% |
327,200
-82,900
| -20% | -$26.9M |
|
144
PUT
Pinduoduo
PDD
$121B
| $114M | 0.07% |
1,092,700
-510,500
| -32% | -$53.6M |
|
145
PUT
Constellation Energy
CEG
$93.6B
| $114M | 0.07% |
352,900
-169,000
| -32% | -$44.7M |
|
146
PUT
Walt Disney
DIS
$167B
| $113M | 0.06% |
1,100,600
+90,700
| +9% | +$9.42M |
|
147
CALL
Arista Networks
ANET
$220B
| $113M | 0.06% |
1,100,300
-66,100
| -6% | -$5.72M |
|
|
148
PUT
Vertiv
VRT
$117B
| $110M | 0.06% |
854,200
+385,800
| +82% | +$37.5M |
|
|
149
PUT
Verizon
VZ
$183B
| $109M | 0.06% |
2,520,600
+1,268,400
| +101% | +$54.9M |
|
150
PUT
GE Aerospace
GE
$353B
| $109M | 0.06% |
429,400
+253,500
| +144% | +$55.6M |
|
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.