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 | |
|---|---|---|---|---|---|---|
|
AZEK
6226
DELISTED
The AZEK Co
AZEK
| $36K | ﹤0.01% |
+679
| New | +$34K |
|
6227
CALL
Boston Omaha
BOC
$436M
| $36K | ﹤0.01% |
2,600
-800
| -24% | -$11.7K |
|
6228
CALL
Cerus
CERS
$575M
| $36K | ﹤0.01% |
25,700
+14,700
| +134% | +$19.6K |
|
|
CGC
6229
Canopy Growth
CGC
$376M
| $36K | ﹤0.01% |
29,973
-342,806
| -92% | -$456K |
|
6230
CALL
Chesapeake Utilities
CPK
$3.28B
| $36K | ﹤0.01% |
+300
| New | +$37.7K |
|
6231
PUT
Encompass Health
EHC
$11.3B
| $36K | ﹤0.01% |
300
-100
| -25% | -$11.4K |
|
6232
EMQQ The Emerging Markets Internet & Ecommerce ETF
EMQQ
$269M
| $36K | ﹤0.01% |
887
-116
| -12% | -$4.51K |
|
6233
First Trust Dow Jones Internet Index Fund ETF
FDN
$4.99B
| $36K | ﹤0.01% |
137
-1,673
| -92% | -$402K |
|
6234
PUT
Flowers Foods
FLO
$1.58B
| $36K | ﹤0.01% |
2,300
+1,400
| +156% | +$24.1K |
|
6235
PUT
Flowserve
FLS
$8.94B
| $36K | ﹤0.01% |
700
-600
| -46% | -$28.2K |
|
6236
CALL
Gran Tierra Energy
GTE
$236M
| $36K | ﹤0.01% |
7,700
+3,600
| +88% | +$17.1K |
|
6237
PUT
Gates Industrial Corporation Ltd.
GTES
$6.31B
| $36K | ﹤0.01% |
1,600
-8,800
| -85% | -$177K |
|
6238
CALL
Integra LifeSciences
IART
$1.28B
| $36K | ﹤0.01% |
+3,000
| New | +$43.6K |
|
6239
PUT
LoveSac
LOVE
$242M
| $36K | ﹤0.01% |
2,000
-1,600
| -44% | -$30.4K |
|
6240
MINISO
MNSO
$3.88B
| $36K | ﹤0.01% |
2,020
-43,736
| -96% | -$786K |
|
6241
CALL
MYR Group
MYRG
$5.01B
| $36K | ﹤0.01% |
+200
| New | +$29.4K |
|
6242
Nano X Imaging
NNOX
$61.1M
| $36K | ﹤0.01% |
6,967
-24,354
| -78% | -$124K |
|
|
NOA
6243
CALL
North American Construction
NOA
$357M
| $36K | ﹤0.01% |
+2,300
| New | +$37.4K |
|
|
OGI
6244
CALL
Organigram Holdings
OGI
$131M
| $36K | ﹤0.01% |
27,200
-6,400
| -19% | -$7.79K |
|
6245
CALL
Purple Innovation
PRPL
$34.5M
| $36K | ﹤0.01% |
2,016
+1,700
| +538% | +$31.3K |
|
6246
CALL
Smart Sand
SND
$179M
| $36K | ﹤0.01% |
18,300
-1,900
| -9% | -$3.85K |
|
6247
Southwest Gas
SWX
$6.64B
| $36K | ﹤0.01% |
+496
| New | +$35.8K |
|
6248
CALL
US Commodity Index
USCI
$370M
| $36K | ﹤0.01% |
+500
| New | +$35.5K |
|
6249
CALL
Vanda Pharmaceuticals
VNDA
$304M
| $36K | ﹤0.01% |
7,800
-80,800
| -91% | -$353K |
|
|
KQQQ
6250
CALL
Kurv Technology Titans Select ETF
KQQQ
$117M
| $36K | ﹤0.01% |
1,400
+1,100
| +367% | +$26.7K |
|
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.