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 | |
|---|---|---|---|---|---|---|
4126
CALL
United Microelectronic
UMC
$43.6B
| $286K | ﹤0.01% |
37,400
-9,100
| -20% | -$67.5K |
|
4127
PUT
Vulcan Materials
VMC
$37.4B
| $286K | ﹤0.01% |
1,100
+800
| +267% | +$206K |
|
4128
PUT
Bread Financial
BFH
$4.36B
| $285K | ﹤0.01% |
5,000
-100
| -2% | -$5.04K |
|
4129
Amkor Technology
AMKR
$11.3B
| $284K | ﹤0.01% |
+13,554
| New | +$250K |
|
4130
PUT
Sunoco
SUN
$14.4B
| $284K | ﹤0.01% |
5,300
-13,100
| -71% | -$723K |
|
4131
PUT
Telus
TU
$16.7B
| $284K | ﹤0.01% |
17,700
-8,800
| -33% | -$136K |
|
|
FMDG
4132
CALL
DELISTED
Fieldstone Merlin Dynamic Large Cap Growth ETF
FMDG
| $284K | ﹤0.01% |
+6,600
| New | +$284K |
|
|
GOLD
4133
CALL
Gold.com Inc
GOLD
$1.18B
| $283K | ﹤0.01% |
12,800
+3,200
| +33% | +$71K |
|
4134
Capital Bancorp
CBNK
$615M
| $283K | ﹤0.01% |
+8,430
| New | +$259K |
|
4135
CALL
Louisiana-Pacific
LPX
$5.35B
| $283K | ﹤0.01% |
3,300
-2,800
| -46% | -$249K |
|
4136
CALL
LegalZoom.com
LZ
$1.39B
| $283K | ﹤0.01% |
31,800
-31,100
| -49% | -$261K |
|
|
MODV
4137
CALL
DELISTED
ModivCare
MODV
| $283K | ﹤0.01% |
+90,900
| New | +$167K |
|
4138
Newell Brands
NWL
$2.24B
| $283K | ﹤0.01% |
52,408
-30,401
| -37% | -$161K |
|
4139
PUT
Oshkosh
OSK
$9.51B
| $283K | ﹤0.01% |
2,500
-1,300
| -34% | -$126K |
|
4140
CALL
Roper Technologies
ROP
$38.7B
| $283K | ﹤0.01% |
500
-500
| -50% | -$283K |
|
4141
Ryan Specialty Holdings
RYAN
$5.96B
| $283K | ﹤0.01% |
4,164
+1,411
| +51% | +$97.4K |
|
4142
CALL
W&T Offshore
WTI
$473M
| $283K | ﹤0.01% |
172,000
+132,200
| +332% | +$195K |
|
4143
First Majestic Silver
AG
$7.75B
| $282K | ﹤0.01% |
34,107
-174,294
| -84% | -$1.17M |
|
4144
CALL
Cullen/Frost Bankers
CFR
$10.5B
| $282K | ﹤0.01% |
2,200
-2,500
| -53% | -$306K |
|
4145
CALL
Immersion
IMMR
$254M
| $282K | ﹤0.01% |
35,900
+28,900
| +413% | +$215K |
|
4146
Kinross Gold
KGC
$28.1B
| $282K | ﹤0.01% |
18,072
-18,668
| -51% | -$272K |
|
4147
PUT
Quantum-Si Incorporated
QSI
$166M
| $282K | ﹤0.01% |
144,200
-60,500
| -30% | -$89.5K |
|
4148
CALL
AMN Healthcare
AMN
$1.35B
| $281K | ﹤0.01% |
13,600
+7,800
| +134% | +$162K |
|
4149
PUT
Brookfield Renewable
BEPC
$5.93B
| $281K | ﹤0.01% |
8,600
-10,800
| -56% | -$315K |
|
4150
CALL
Crescent Energy
CRGY
$3.44B
| $281K | ﹤0.01% |
32,700
-900
| -3% | -$7.88K |
|
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.