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 | |
|---|---|---|---|---|---|---|
1476
PUT
SharkNinja
SN
$21B
| $4.32M | ﹤0.01% |
43,600
-154,500
| -78% | -$13.4M |
|
1477
CALL
TMC The Metals Company
TMC
$1.59B
| $4.31M | ﹤0.01% |
652,700
+158,200
| +32% | +$607K |
|
1478
CALL
Onto Innovation
ONTO
$13.6B
| $4.3M | ﹤0.01% |
42,600
-6,200
| -13% | -$662K |
|
1479
PUT
Copart
CPRT
$25.9B
| $4.3M | ﹤0.01% |
87,600
+15,800
| +22% | +$884K |
|
1480
PUT
Universal Health Services
UHS
$9.43B
| $4.29M | ﹤0.01% |
23,700
+17,000
| +254% | +$3.07M |
|
|
CIM
1481
CALL
Chimera Investment
CIM
$1.05B
| $4.29M | ﹤0.01% |
309,400
+280,500
| +971% | +$3.58M |
|
1482
CALL
Conagra Brands
CAG
$7.07B
| $4.29M | ﹤0.01% |
209,600
+94,000
| +81% | +$2.2M |
|
1483
CALL
PBF Energy
PBF
$7.29B
| $4.29M | ﹤0.01% |
198,000
+31,700
| +19% | +$603K |
|
1484
CALL
YPF
YPF
$20.2B
| $4.29M | ﹤0.01% |
136,300
+20,600
| +18% | +$688K |
|
1485
PUT
Fidelity National Information Services
FIS
$21.5B
| $4.28M | ﹤0.01% |
52,600
+6,900
| +15% | +$537K |
|
1486
CALL
Dana Inc
DAN
$2.91B
| $4.28M | ﹤0.01% |
249,400
+241,200
| +2,941% | +$3.6M |
|
1487
PUT
NiSource
NI
$22.4B
| $4.27M | ﹤0.01% |
105,900
-7,500
| -7% | -$294K |
|
1488
CALL
Ferrari
RACE
$63.3B
| $4.27M | ﹤0.01% |
8,700
-13,600
| -61% | -$6.32M |
|
1489
PUT
Canadian Natural Resources
CNQ
$96.9B
| $4.26M | ﹤0.01% |
135,700
+16,200
| +14% | +$491K |
|
1490
CALL
Powell Industries
POWL
$8.46B
| $4.25M | ﹤0.01% |
60,600
-15,000
| -20% | -$905K |
|
1491
PUT
ACM Research
ACMR
$5.83B
| $4.25M | ﹤0.01% |
164,100
-48,700
| -23% | -$1.1M |
|
1492
CALL
Dynatrace
DT
$12.1B
| $4.25M | ﹤0.01% |
76,900
-31,500
| -29% | -$1.58M |
|
1493
BP
BP
$113B
| $4.24M | ﹤0.01% |
+141,526
| New | +$4.15M |
|
1494
CALL
RUM Group Inc
RUM
$1.57B
| $4.23M | ﹤0.01% |
471,600
-73,800
| -14% | -$631K |
|
1495
CALL
Vornado Realty Trust
VNO
$7.47B
| $4.23M | ﹤0.01% |
110,600
+8,200
| +8% | +$307K |
|
1496
CALL
Synchrony
SYF
$23.7B
| $4.22M | ﹤0.01% |
63,200
-95,200
| -60% | -$5.32M |
|
1497
PUT
Hasbro
HAS
$12.6B
| $4.18M | ﹤0.01% |
56,700
+6,300
| +13% | +$397K |
|
1498
PUT
PACCAR
PCAR
$69.6B
| $4.18M | ﹤0.01% |
44,000
-12,500
| -22% | -$1.15M |
|
1499
PUT
Canadian Pacific Kansas City
CP
$82B
| $4.18M | ﹤0.01% |
52,700
-44,600
| -46% | -$3.43M |
|
|
1500
PUT
Synchrony
SYF
$23.7B
| $4.17M | ﹤0.01% |
62,500
-32,300
| -34% | -$1.81M |
|
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.