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 |
Microsoft
MSFT
|
+$53.9M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$52.9M |
| 3 |
NVIDIA
NVDA
|
+$47.1M |
| 4 |
PayPal
PYPL
|
+$41.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$28.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$51.4M |
| 2 |
Walmart Inc
WMT
|
+$46.4M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$34.2M |
| 4 |
Adobe
ADBE
|
+$33.5M |
| 5 |
Starbucks
SBUX
|
+$26.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Healthcare | 0.21% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.2% |
| 5 | Financials | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4126
PUT
Clearfield
CLFD
$397M
| $232K | ﹤0.01% |
4,900
-56,400
| -92% | -$2.41M |
|
4127
PUT
Dine Brands
DIN
$458M
| $232K | ﹤0.01% |
4,000
-16,900
| -81% | -$1.08M |
|
|
KC
4128
Kingsoft Cloud Holdings
KC
$2.99B
| $232K | ﹤0.01% |
+38,110
| New | +$227K |
|
4129
PUT
Portillo's
PTLO
$347M
| $232K | ﹤0.01% |
10,300
+5,300
| +106% | +$110K |
|
4130
PUT
Tradeweb Markets
TW
$22.6B
| $232K | ﹤0.01% |
3,400
+2,500
| +278% | +$177K |
|
4131
CALL
Energy Fuels
UUUU
$2.76B
| $232K | ﹤0.01% |
37,300
+4,900
| +15% | +$28.8K |
|
4132
PUT
AbCellera Biologics
ABCL
$1.65B
| $231K | ﹤0.01% |
35,800
+3,900
| +12% | +$26.6K |
|
4133
CALL
Brookfield Asset Management
BAM
$75.4B
| $231K | ﹤0.01% |
7,100
-6,900
| -49% | -$222K |
|
4134
PUT
Diodes
DIOD
$3.52B
| $231K | ﹤0.01% |
2,500
+2,300
| +1,150% | +$203K |
|
4135
Everest Group
EG
$15.7B
| $231K | ﹤0.01% |
+676
| New | +$244K |
|
|
ESPR
4136
PUT
DELISTED
Esperion Therapeutics
ESPR
| $231K | ﹤0.01% |
166,800
+47,900
| +40% | +$66.9K |
|
4137
PUT
nCino
NCNO
$2.05B
| $231K | ﹤0.01% |
7,700
+900
| +13% | +$22.9K |
|
4138
CarGurus
CARG
$3.35B
| $230K | ﹤0.01% |
+10,205
| New | +$193K |
|
|
DEA
4139
PUT
Easterly Government Properties
DEA
$1.18B
| $230K | ﹤0.01% |
6,360
-4,320
| -40% | -$152K |
|
4140
EVgo
EVGO
$224M
| $230K | ﹤0.01% |
57,523
-2,319
| -4% | -$11.8K |
|
4141
CALL
Globe Life
GL
$13.9B
| $230K | ﹤0.01% |
2,100
-1,000
| -32% | -$107K |
|
4142
CALL
Harrow
HROW
$1.46B
| $230K | ﹤0.01% |
12,100
+5,800
| +92% | +$128K |
|
4143
CALL
Northeast Community Bancorp
NECB
$375M
| $230K | ﹤0.01% |
15,500
+1,100
| +8% | +$14.8K |
|
4144
PUT
Sypris Solutions
SYPR
$44.2M
| $230K | ﹤0.01% |
112,800
-4,700
| -4% | -$9.35K |
|
|
SBOW
4145
CALL
DELISTED
SilverBow Resources, Inc.
SBOW
| $230K | ﹤0.01% |
7,900
+3,400
| +76% | +$84.1K |
|
4146
PUT
Federal Agricultural Mortgage Class A
AGM.A
| $229K | ﹤0.01% |
1,600
-200
| -11% | -$23K |
|
4147
CALL
Alto Ingredients
ALTO
$336M
| $229K | ﹤0.01% |
79,300
+18,700
| +31% | +$35.6K |
|
4148
PUT
United States Brent Oil Fund
BNO
$779M
| $229K | ﹤0.01% |
9,000
-14,200
| -61% | -$371K |
|
4149
Lattice Semiconductor
LSCC
$16.4B
| $229K | ﹤0.01% |
+2,392
| New | +$206K |
|
4150
CALL
La-Z-Boy
LZB
$1.63B
| $229K | ﹤0.01% |
8,000
-7,300
| -48% | -$204K |
|
Similar funds
Simplex Trading's Q2 2023 Portfolio in Review
As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
- Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
- Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
- Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
- Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
- Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.
Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.