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 | |
|---|---|---|---|---|---|---|
|
GES
1876
CALL
DELISTED
Guess Inc
GES
| $2.27M | ﹤0.01% |
116,700
+111,800
| +2,282% | +$2.15M |
|
1877
PennyMac Financial
PFSI
$4.38B
| $2.27M | ﹤0.01% |
32,281
+27,957
| +647% | +$1.77M |
|
1878
Pacific Biosciences
PACB
$422M
| $2.27M | ﹤0.01% |
+170,443
| New | +$2.07M |
|
1879
PUT
Canadian National Railway
CNI
$78.3B
| $2.26M | ﹤0.01% |
18,700
+11,800
| +171% | +$1.4M |
|
1880
CALL
Gaming and Leisure Properties
GLPI
$12.8B
| $2.26M | ﹤0.01% |
46,600
-136,700
| -75% | -$6.82M |
|
1881
PUT
Array Technologies
ARRY
$818M
| $2.26M | ﹤0.01% |
99,900
-16,500
| -14% | -$353K |
|
1882
SolarEdge
SEDG
$2.59B
| $2.25M | ﹤0.01% |
+8,381
| New | +$2.4M |
|
1883
Trane Technologies
TT
$106B
| $2.25M | ﹤0.01% |
+11,785
| New | +$2.09M |
|
1884
PUT
Boston Beer
SAM
$1.88B
| $2.25M | ﹤0.01% |
7,300
+2,500
| +52% | +$804K |
|
1885
PUT
Toast
TOST
$16.8B
| $2.25M | ﹤0.01% |
99,700
+22,400
| +29% | +$447K |
|
1886
PUT
Tyler Technologies
TYL
$12.2B
| $2.25M | ﹤0.01% |
5,400
+4,600
| +575% | +$1.77M |
|
1887
Aehr Test Systems
AEHR
$2.48B
| $2.24M | ﹤0.01% |
54,413
+51,099
| +1,542% | +$1.68M |
|
1888
CALL
Louisiana-Pacific
LPX
$5.2B
| $2.24M | ﹤0.01% |
29,900
+7,300
| +32% | +$451K |
|
1889
Dominion Energy
D
$62.5B
| $2.24M | ﹤0.01% |
43,268
-31,047
| -42% | -$1.69M |
|
1890
Samsara
IOT
$19.3B
| $2.24M | ﹤0.01% |
80,749
+9,743
| +14% | +$216K |
|
|
SEE
1891
CALL
DELISTED
Sealed Air
SEE
| $2.24M | ﹤0.01% |
55,900
+52,800
| +1,703% | +$2.25M |
|
1892
Elanco Animal Health
ELAN
$12.4B
| $2.23M | ﹤0.01% |
222,248
+101,998
| +85% | +$947K |
|
1893
Unum
UNM
$13.8B
| $2.22M | ﹤0.01% |
46,643
+16,545
| +55% | +$722K |
|
1894
PUT
GlobalFoundries
GFS
$29.4B
| $2.22M | ﹤0.01% |
34,400
+3,800
| +12% | +$230K |
|
1895
PUT
FirstEnergy
FE
$28.9B
| $2.22M | ﹤0.01% |
57,100
+900
| +2% | +$35.3K |
|
|
1896
CALL
Aehr Test Systems
AEHR
$2.48B
| $2.22M | ﹤0.01% |
53,800
-73,200
| -58% | -$2.4M |
|
1897
PUT
Huntington Bancshares
HBAN
$35.1B
| $2.22M | ﹤0.01% |
205,900
+92,800
| +82% | +$992K |
|
|
FRG
1898
CALL
DELISTED
Franchise Group, Inc.
FRG
| $2.22M | ﹤0.01% |
77,500
+4,000
| +5% | +$115K |
|
1899
Constellation Energy
CEG
$98B
| $2.21M | ﹤0.01% |
24,154
-8,613
| -26% | -$714K |
|
1900
CALL
Sturm, Ruger & Co
RGR
$610M
| $2.21M | ﹤0.01% |
41,700
+37,200
| +827% | +$2.03M |
|
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.