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 | |
|---|---|---|---|---|---|---|
2126
Baxter International
BAX
$11.6B
| $1.97M | ﹤0.01% |
65,181
+14,303
| +28% | +$434K |
|
2127
PUT
Cogent Communications
CCOI
$594M
| $1.97M | ﹤0.01% |
40,900
+38,500
| +1,604% | +$1.96M |
|
2128
PUT
Jackson Financial
JXN
$8.32B
| $1.97M | ﹤0.01% |
22,200
-8,700
| -28% | -$705K |
|
|
CWAN
2129
CALL
DELISTED
Clearwater Analytics
CWAN
| $1.97M | ﹤0.01% |
89,800
+53,000
| +144% | +$1.22M |
|
2130
PUT
JPMorgan Inflation Managed Bond ETF
JCPI
$865M
| $1.97M | ﹤0.01% |
36,200
-37,700
| -51% | -$1.8M |
|
2131
CALL
Keros Therapeutics
KROS
$199M
| $1.96M | ﹤0.01% |
147,100
-55,000
| -27% | -$743K |
|
2132
Sable Offshore Corp
SOC
$903M
| $1.96M | ﹤0.01% |
89,286
-76,273
| -46% | -$1.77M |
|
2133
PUT
Citizens Financial Group
CFG
$30.4B
| $1.96M | ﹤0.01% |
43,800
-118,000
| -73% | -$4.64M |
|
2134
CALL
Tetra Tech
TTEK
$8.23B
| $1.96M | ﹤0.01% |
54,500
-1,700
| -3% | -$56.6K |
|
2135
CALL
ACV Auctions
ACVA
$1.35B
| $1.95M | ﹤0.01% |
120,500
-37,900
| -24% | -$590K |
|
2136
Ramaco Resources Class A
METC
$676M
| $1.95M | ﹤0.01% |
+148,631
| New | +$1.42M |
|
2137
CALL
Zions Bancorporation
ZION
$10.1B
| $1.95M | ﹤0.01% |
37,600
+3,700
| +11% | +$174K |
|
2138
BorgWarner
BWA
$13.2B
| $1.95M | ﹤0.01% |
58,292
+49,139
| +537% | +$1.51M |
|
2139
CALL
SharkNinja
SN
$21B
| $1.95M | ﹤0.01% |
19,700
-18,700
| -49% | -$1.62M |
|
2140
CALL
Republic Services
RSG
$66.7B
| $1.95M | ﹤0.01% |
7,900
+2,800
| +55% | +$692K |
|
2141
CALL
Yeti Holdings
YETI
$3.82B
| $1.95M | ﹤0.01% |
61,800
-12,600
| -17% | -$378K |
|
2142
NexGen Energy
NXE
$6.05B
| $1.94M | ﹤0.01% |
280,171
-29,787
| -10% | -$168K |
|
2143
CALL
Dover
DOV
$27.2B
| $1.94M | ﹤0.01% |
10,600
+5,700
| +116% | +$992K |
|
2144
PUT
Albertsons Companies
ACI
$5.4B
| $1.94M | ﹤0.01% |
90,100
-194,200
| -68% | -$4.22M |
|
|
2145
PUT
Keros Therapeutics
KROS
$199M
| $1.94M | ﹤0.01% |
145,000
+11,900
| +9% | +$161K |
|
2146
Edison International
EIX
$30.7B
| $1.93M | ﹤0.01% |
37,487
-139,393
| -79% | -$7.64M |
|
2147
PUT
Tradeweb Markets
TW
$21.3B
| $1.93M | ﹤0.01% |
13,200
+5,500
| +71% | +$767K |
|
2148
PUT
Webster Financial
WBS
$12.3B
| $1.93M | ﹤0.01% |
35,400
-20,700
| -37% | -$1.03M |
|
2149
PUT
Banco Macro
BMA
$5.7B
| $1.93M | ﹤0.01% |
27,500
+16,300
| +146% | +$1.35M |
|
|
LX
2150
CALL
LexinFintech Holdings
LX
$244M
| $1.92M | ﹤0.01% |
266,900
+126,000
| +89% | +$978K |
|
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.