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 | |
|---|---|---|---|---|---|---|
76
CALL
Nike
NKE
$63.7B
| $234M | 0.13% |
3,295,900
+76,800
| +2% | +$4.61M |
|
|
CRWV
77
PUT
CoreWeave
CRWV
$43.4B
| $233M | 0.13% |
+1,426,600
| New | +$132M |
|
78
CALL
Intel
INTC
$530B
| $230M | 0.13% |
10,281,200
-343,900
| -3% | -$7.13M |
|
79
CALL
CrowdStrike
CRWD
$195B
| $227M | 0.13% |
1,782,800
+275,200
| +18% | +$29.8M |
|
80
PUT
Costco
COST
$412B
| $222M | 0.13% |
240,300
-82,400
| -26% | -$81.9M |
|
81
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $218M | 0.12% |
494,000
+109,000
| +28% | +$45.2M |
|
82
CALL
Walmart Inc
WMT
$878B
| $218M | 0.12% |
2,225,300
-908,700
| -29% | -$86.6M |
|
83
PUT
Cisco
CSCO
$442B
| $216M | 0.12% |
3,112,400
+1,868,400
| +150% | +$115M |
|
|
84
CALL
Costco
COST
$412B
| $213M | 0.12% |
215,600
-53,500
| -20% | -$53.2M |
|
|
85
Apple
AAPL
$4.81T
| $210M | 0.12% |
1,021,727
+772,959
| +311% | +$156M |
|
86
CALL
ExxonMobil
XOM
$629B
| $207M | 0.12% |
1,980,900
+157,100
| +9% | +$16.8M |
|
87
PUT
ARK Space & Defense Innovation ETF
ARKX
$823M
| $202M | 0.12% |
3,083,500
+1,634,100
| +113% | +$32.6M |
|
88
CALL
Wells Fargo
WFC
$261B
| $201M | 0.11% |
2,505,000
+809,000
| +48% | +$58.3M |
|
89
CALL
Pinduoduo
PDD
$121B
| $197M | 0.11% |
1,885,600
-148,900
| -7% | -$15.6M |
|
90
CALL
Salesforce
CRM
$139B
| $197M | 0.11% |
723,700
-130,200
| -15% | -$34.8M |
|
|
91
PUT
Wells Fargo
WFC
$261B
| $196M | 0.11% |
2,449,700
+270,100
| +12% | +$19.5M |
|
|
92
PUT
Walmart Inc
WMT
$878B
| $196M | 0.11% |
2,002,300
-649,000
| -24% | -$61.8M |
|
93
PUT
Berkshire Hathaway Class B
BRK.B
$1.06T
| $195M | 0.11% |
400,600
-131,300
| -25% | -$66.7M |
|
94
CALL
Walt Disney
DIS
$167B
| $194M | 0.11% |
1,568,000
-161,100
| -9% | -$16.7M |
|
|
95
PUT
CrowdStrike
CRWD
$195B
| $189M | 0.11% |
1,682,400
+362,000
| +27% | +$39.2M |
|
96
CALL
Uber
UBER
$146B
| $188M | 0.11% |
2,016,100
-450,600
| -18% | -$37.1M |
|
97
PUT
IBM
IBM
$198B
| $186M | 0.11% |
630,300
+135,600
| +27% | +$34.9M |
|
98
CALL
Carvana
CVNA
$47B
| $184M | 0.11% |
2,724,000
-541,500
| -17% | -$29.7M |
|
99
CALL
Bank of America
BAC
$430B
| $183M | 0.11% |
3,876,200
+1,210,900
| +45% | +$50.9M |
|
|
100
PUT
Uber
UBER
$146B
| $181M | 0.1% |
2,236,800
-34,100
| -2% | -$2.81M |
|
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.