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 | |
|---|---|---|---|---|---|---|
601
CALL
MGM Resorts International
MGM
$11.6B
| $18.1M | 0.01% |
525,300
+1,300
| +0.2% | +$41.2K |
|
602
CALL
Quanta Services
PWR
$96.5B
| $18M | 0.01% |
47,700
-1,600
| -3% | -$514K |
|
603
CALL
Cencora
COR
$58.5B
| $18M | 0.01% |
60,100
-2,000
| -3% | -$576K |
|
604
PUT
Lennar Class A
LEN
$19.8B
| $17.9M | 0.01% |
273,100
+36,800
| +16% | +$3.99M |
|
605
PUT
Zoom
ZM
$25.2B
| $17.7M | 0.01% |
227,500
-23,700
| -9% | -$1.83M |
|
606
iShares Bitcoin Trust
IBIT
$48.4B
| $17.7M | 0.01% |
289,568
-213,451
| -42% | -$12M |
|
607
CALL
The GEO Group
GEO
$4.19B
| $17.7M | 0.01% |
739,300
+104,100
| +16% | +$2.84M |
|
608
CALL
Veeva Systems
VEEV
$30B
| $17.7M | 0.01% |
61,400
+22,700
| +59% | +$5.63M |
|
609
Direxion Daily Financial Bull 3x ETF
FAS
$2.37B
| $17.6M | 0.01% |
104,672
+23,052
| +28% | +$3.36M |
|
610
PUT
Vale
VALE
$63.2B
| $17.6M | 0.01% |
1,811,900
-559,100
| -24% | -$5.27M |
|
611
PUT
D-Wave Quantum
QBTS
$6.43B
| $17.6M | 0.01% |
1,200,200
+423,500
| +55% | +$4.98M |
|
612
CALL
AB InBev
BUD
$160B
| $17.5M | 0.01% |
254,700
-51,900
| -17% | -$3.49M |
|
613
CALL
Rocket Companies
RKT
$38B
| $17.4M | 0.01% |
1,228,000
+397,400
| +48% | +$5.16M |
|
614
CALL
SiriusXM
SIRI
$10B
| $17.3M | 0.01% |
754,400
-137,400
| -15% | -$2.96M |
|
615
PUT
EQT Corp
EQT
$33.8B
| $17.3M | 0.01% |
296,400
+500
| +0.2% | +$27K |
|
616
CALL
Archer Daniels Midland
ADM
$42.1B
| $17.2M | 0.01% |
326,500
-55,100
| -14% | -$2.68M |
|
617
Nu Holdings
NU
$70.1B
| $17.1M | 0.01% |
1,246,517
+806,594
| +183% | +$9.66M |
|
618
CALL
Fluor
FLR
$7.21B
| $17.1M | 0.01% |
332,800
+149,300
| +81% | +$5.95M |
|
619
PUT
Iron Mountain
IRM
$37B
| $17M | 0.01% |
165,500
-7,000
| -4% | -$660K |
|
620
CALL
Samsara
IOT
$19.4B
| $17M | 0.01% |
426,400
+99,200
| +30% | +$4.1M |
|
621
ASML
ASML
$692B
| $16.8M | 0.01% |
+21,017
| New | +$15.1M |
|
622
PUT
Deckers Outdoor
DECK
$14.2B
| $16.8M | 0.01% |
162,700
+31,100
| +24% | +$3.44M |
|
623
PUT
Dutch Bros
BROS
$8.91B
| $16.7M | 0.01% |
244,000
+95,900
| +65% | +$6.26M |
|
624
PUT
Autodesk
ADSK
$43B
| $16.7M | 0.01% |
53,800
-41,700
| -44% | -$11.8M |
|
625
PUT
Five Below
FIVE
$11.3B
| $16.6M | 0.01% |
126,500
-20,800
| -14% | -$2.03M |
|
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.