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 | |
|---|---|---|---|---|---|---|
3101
PUT
West Pharmaceutical
WST
$23.1B
| $743K | ﹤0.01% |
3,400
| – | – |
|
|
NMAX
3102
PUT
Newsmax Inc
NMAX
$1.01B
| $742K | ﹤0.01% |
+49,100
| New | +$1.29M |
|
3103
CALL
Tenaris
TS
$28.6B
| $740K | ﹤0.01% |
19,800
-9,000
| -31% | -$309K |
|
|
WCC
3104
CALL
WESCO International
WCC
$16B
| $740K | ﹤0.01% |
4,000
-9,700
| -71% | -$1.6M |
|
3105
CALL
Inspire Medical Systems
INSP
$1.47B
| $739K | ﹤0.01% |
5,700
+4,700
| +470% | +$682K |
|
3106
PUT
Anavex Life Sciences
AVXL
$234M
| $738K | ﹤0.01% |
80,100
-27,400
| -25% | -$234K |
|
3107
CALL
NNN REIT
NNN
$9.38B
| $738K | ﹤0.01% |
17,100
+3,400
| +25% | +$141K |
|
3108
CALL
Newell Brands
NWL
$2.24B
| $738K | ﹤0.01% |
136,700
+32,800
| +32% | +$174K |
|
3109
Ondas Inc
ONDS
$4.4B
| $738K | ﹤0.01% |
384,769
+339,082
| +742% | +$379K |
|
|
HITI
3110
CALL
High Tide
HITI
$189M
| $737K | ﹤0.01% |
320,500
+149,800
| +88% | +$336K |
|
|
INFA
3111
PUT
DELISTED
Informatica
INFA
| $737K | ﹤0.01% |
30,300
+30,000
| +10,000% | +$619K |
|
3112
PUT
Chord Energy
CHRD
$7.55B
| $736K | ﹤0.01% |
7,600
-900
| -11% | -$85.7K |
|
3113
CALL
MoonLake Immunotherapeutics
MLTX
$1.66B
| $736K | ﹤0.01% |
15,600
-6,200
| -28% | -$253K |
|
3114
PUT
Dycom Industries
DY
$12.5B
| $733K | ﹤0.01% |
3,000
-2,300
| -43% | -$453K |
|
3115
PUT
Morgan Stanley Direct Lending Fund
MSDL
$1.3B
| $733K | ﹤0.01% |
39,200
| – | – |
|
3116
SentinelOne
S
$6.28B
| $733K | ﹤0.01% |
+40,109
| New | +$734K |
|
3117
CALL
Black Stone Minerals
BSM
$3.18B
| $732K | ﹤0.01% |
56,000
-4,300
| -7% | -$59.4K |
|
3118
CALL
Seres Therapeutics
MCRB
$48.1M
| $732K | ﹤0.01% |
65,900
+63,295
| +2,430% | +$557K |
|
3119
CALL
Microvision
MVIS
$86.8M
| $732K | ﹤0.01% |
642,800
+383,900
| +148% | +$443K |
|
|
FINV
3120
PUT
FinVolution Group
FINV
$1.14B
| $731K | ﹤0.01% |
77,200
+53,500
| +226% | +$457K |
|
3121
PUT
NexGen Energy
NXE
$6.11B
| $731K | ﹤0.01% |
105,400
-241,700
| -70% | -$1.36M |
|
3122
CALL
Invesco DB Commodity Index Tracking Fund
DBC
$1.68B
| $730K | ﹤0.01% |
33,500
+29,400
| +717% | +$630K |
|
3123
PUT
Freedom Holding
FRHC
$9.73B
| $730K | ﹤0.01% |
5,000
+2,800
| +127% | +$413K |
|
3124
CALL
Life Time Group Holdings
LTH
$9.6B
| $730K | ﹤0.01% |
24,100
-9,500
| -28% | -$282K |
|
3125
Viavi Solutions
VIAV
$9.23B
| $729K | ﹤0.01% |
72,469
+60,194
| +490% | +$582K |
|
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.