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 | |
|---|---|---|---|---|---|---|
101
PUT
Arm
ARM
$305B
| $181M | 0.1% |
1,116,400
-137,800
| -11% | -$17.1M |
|
102
PUT
iShares Silver Trust
SLV
$29B
| $181M | 0.1% |
5,503,400
-298,300
| -5% | -$9.12M |
|
103
CALL
PayPal
PYPL
$48.9B
| $178M | 0.1% |
2,401,600
-205,100
| -8% | -$14M |
|
104
PUT
Goldman Sachs
GS
$323B
| $176M | 0.1% |
248,500
-166,200
| -40% | -$96.3M |
|
105
CALL
Applovin
APP
$140B
| $172M | 0.1% |
490,800
-238,300
| -33% | -$77.3M |
|
106
PUT
Chevron
CVX
$385B
| $171M | 0.1% |
1,244,300
+655,700
| +111% | +$92.4M |
|
107
CALL
Cisco
CSCO
$445B
| $169M | 0.1% |
2,438,100
+15,900
| +0.7% | +$977K |
|
108
CALL
First Solar
FSLR
$22.4B
| $169M | 0.1% |
1,098,800
+632,800
| +136% | +$93.4M |
|
109
PUT
Super Micro Computer
SMCI
$20.5B
| $164M | 0.09% |
3,348,300
-3,773,900
| -53% | -$145M |
|
|
110
CALL
Arm
ARM
$305B
| $164M | 0.09% |
1,011,800
+101,200
| +11% | +$12.6M |
|
|
UWC
111
CALL
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $158M | 0.09% |
1,902,800
+337,900
| +22% | +$28.1M |
|
|
112
Broadcom
AVGO
$1.85T
| $152M | 0.09% |
551,694
+464,849
| +535% | +$101M |
|
113
PUT
ExxonMobil
XOM
$639B
| $152M | 0.09% |
1,563,800
+387,000
| +33% | +$41.4M |
|
|
114
CALL
Chevron
CVX
$385B
| $149M | 0.09% |
1,042,500
+121,100
| +13% | +$17.1M |
|
115
PUT
Visa
V
$675B
| $149M | 0.09% |
418,400
+130,500
| +45% | +$45.5M |
|
116
PUT
Marvell Technology
MRVL
$190B
| $148M | 0.09% |
1,918,100
+789,400
| +70% | +$49.3M |
|
117
CALL
ASML
ASML
$690B
| $147M | 0.08% |
183,900
-82,500
| -31% | -$59.2M |
|
|
118
CALL
Visa
V
$675B
| $147M | 0.08% |
414,900
-22,900
| -5% | -$7.98M |
|
119
CALL
Morgan Stanley
MS
$344B
| $147M | 0.08% |
1,042,300
+180,600
| +21% | +$22.2M |
|
120
PUT
SoFi Technologies
SOFI
$21.8B
| $146M | 0.08% |
8,019,700
+2,644,700
| +49% | +$34.9M |
|
121
PUT
Salesforce
CRM
$135B
| $142M | 0.08% |
520,500
+31,000
| +6% | +$8.29M |
|
122
CALL
Snowflake
SNOW
$92.1B
| $142M | 0.08% |
632,400
+36,400
| +6% | +$6.58M |
|
|
CRCL
123
CALL
Circle Internet Group
CRCL
$17B
| $139M | 0.08% |
+764,200
| New | +$124M |
|
124
PUT
Intel
INTC
$532B
| $137M | 0.08% |
6,104,500
-2,014,900
| -25% | -$41.8M |
|
125
CALL
iShares MSCI Australia ETF
EWA
$1.35B
| $136M | 0.08% |
4,012,600
+401,500
| +11% | +$10M |
|
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.