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 | |
|---|---|---|---|---|---|---|
4101
PUT
Spectrum Brands
SPB
$2.08B
| $291K | ﹤0.01% |
5,500
-9,800
| -64% | -$584K |
|
4102
PUT
CorMedix
CRMD
$577M
| $290K | ﹤0.01% |
23,600
-47,300
| -67% | -$522K |
|
4103
Carpenter Technology
CRS
$27.8B
| $290K | ﹤0.01% |
+1,052
| New | +$229K |
|
4104
CALL
Atkore
ATKR
$2.62B
| $289K | ﹤0.01% |
4,100
-3,900
| -49% | -$253K |
|
4105
Fox Class A
FOXA
$24.2B
| $289K | ﹤0.01% |
5,165
-81,200
| -94% | -$4.28M |
|
4106
PUT
TechnipFMC
FTI
$28.9B
| $289K | ﹤0.01% |
8,400
-300
| -3% | -$9.05K |
|
4107
PUT
MSC Industrial Direct
MSM
$6.97B
| $289K | ﹤0.01% |
3,400
-97,500
| -97% | -$7.7M |
|
4108
Amer Sports
AS
$20.9B
| $289K | ﹤0.01% |
+7,474
| New | +$230K |
|
4109
PUT
Idacorp
IDA
$8.24B
| $288K | ﹤0.01% |
2,500
-1,800
| -42% | -$209K |
|
4110
InMode
INMD
$889M
| $288K | ﹤0.01% |
19,987
-29,164
| -59% | -$428K |
|
4111
CALL
Quantum-Si Incorporated
QSI
$166M
| $288K | ﹤0.01% |
147,200
-45,200
| -23% | -$66.9K |
|
4112
CALL
RELX
RELX
$66B
| $288K | ﹤0.01% |
5,300
+3,300
| +165% | +$175K |
|
4113
CALL
Steris
STE
$22.4B
| $288K | ﹤0.01% |
1,200
+600
| +100% | +$140K |
|
4114
Tiptree Inc
TIPT
$678M
| $288K | ﹤0.01% |
+12,224
| New | +$273K |
|
4115
Vicor
VICR
$8.76B
| $288K | ﹤0.01% |
6,351
+2,511
| +65% | +$112K |
|
|
VRNT
4116
DELISTED
Verint Systems
VRNT
| $288K | ﹤0.01% |
+14,675
| New | +$256K |
|
4117
CALL
Columbia Banking Systems
COLB
$8.84B
| $287K | ﹤0.01% |
12,300
+2,000
| +19% | +$46.4K |
|
4118
Jabil
JBL
$31.7B
| $287K | ﹤0.01% |
+1,316
| New | +$213K |
|
4119
CALL
Mama's Creations
MAMA
$830M
| $287K | ﹤0.01% |
34,600
-43,400
| -56% | -$312K |
|
|
MAPS
4120
CALL
DELISTED
WM TECHNOLOGY INC A
MAPS
| $287K | ﹤0.01% |
320,900
-140,600
| -30% | -$151K |
|
4121
CALL
Sabra Healthcare REIT
SBRA
$5.61B
| $287K | ﹤0.01% |
15,600
-200
| -1% | -$3.55K |
|
|
HNGE
4122
Hinge Health
HNGE
$5.82B
| $287K | ﹤0.01% |
+5,563
| New | +$225K |
|
4123
CALL
CG Oncology
CGON
$6.41B
| $286K | ﹤0.01% |
11,000
+2,800
| +34% | +$67.5K |
|
4124
Freedom Holding
FRHC
$9.84B
| $286K | ﹤0.01% |
+1,964
| New | +$290K |
|
|
SVM
4125
PUT
Silvercorp Metals
SVM
$2.08B
| $286K | ﹤0.01% |
68,000
+52,700
| +344% | +$204K |
|
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.