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 | |
|---|---|---|---|---|---|---|
2126
CALL
United Microelectronic
UMC
$48.9B
| $1.67M | ﹤0.01% |
211,700
-50,900
| -19% | -$419K |
|
|
PENG
2127
CALL
Penguin Solutions Inc
PENG
$2.76B
| $1.67M | ﹤0.01% |
57,600
+55,000
| +2,115% | +$1.1M |
|
|
HBI
2128
DELISTED
Hanesbrands
HBI
| $1.67M | ﹤0.01% |
367,461
-257,691
| -41% | -$1.18M |
|
2129
PUT
Xylem
XYL
$28.5B
| $1.67M | ﹤0.01% |
14,800
+11,600
| +363% | +$1.23M |
|
2130
PUT
Albertsons Companies
ACI
$5.4B
| $1.66M | ﹤0.01% |
76,300
+43,200
| +131% | +$899K |
|
2131
CALL
Comstock Resources
CRK
$3.97B
| $1.66M | ﹤0.01% |
143,400
-10,400
| -7% | -$108K |
|
2132
PUT
Leidos
LDOS
$14.1B
| $1.66M | ﹤0.01% |
18,800
+14,400
| +327% | +$1.23M |
|
2133
iShares MSCI China ETF
MCHI
$6.04B
| $1.66M | ﹤0.01% |
37,173
-107,287
| -74% | -$5.02M |
|
2134
CALL
Wintrust Financial
WTFC
$10.7B
| $1.66M | ﹤0.01% |
22,800
+20,900
| +1,100% | +$1.43M |
|
2135
Credo Technology Group
CRDO
$39.7B
| $1.65M | ﹤0.01% |
+95,339
| New | +$1.13M |
|
2136
Avantis US Small Cap Value ETF
AVUV
$29.7B
| $1.65M | ﹤0.01% |
21,287
+554
| +3% | +$40.7K |
|
2137
CALL
ZTO Express
ZTO
$18.2B
| $1.65M | ﹤0.01% |
65,900
-99,900
| -60% | -$2.75M |
|
2138
CALL
ZipRecruiter
ZIP
$318M
| $1.65M | ﹤0.01% |
92,900
-144,800
| -61% | -$2.38M |
|
2139
PUT
Ericsson
ERIC
$30.7B
| $1.65M | ﹤0.01% |
302,200
+5,600
| +2% | +$30K |
|
2140
Honda
HMC
$36.5B
| $1.64M | ﹤0.01% |
54,073
+26,020
| +93% | +$735K |
|
2141
Navitas Semiconductor
NVTS
$2.66B
| $1.64M | ﹤0.01% |
155,483
+137,888
| +784% | +$1.07M |
|
2142
Direxion Daily Semiconductor Bear 3X ETF
SOXS
$1.74B
| $1.64M | ﹤0.01% |
83
+65
| +361% | +$2.07M |
|
|
2143
CALL
Credo Technology Group
CRDO
$39.7B
| $1.63M | ﹤0.01% |
94,100
+50,900
| +118% | +$605K |
|
2144
CALL
Banco Bradesco
BBD
$38.1B
| $1.63M | ﹤0.01% |
470,360
+74,300
| +19% | +$230K |
|
2145
CALL
Pacific Biosciences
PACB
$422M
| $1.63M | ﹤0.01% |
122,200
-506,900
| -81% | -$6.16M |
|
2146
PUT
10x Genomics
TXG
$5.87B
| $1.62M | ﹤0.01% |
29,100
+18,100
| +165% | +$980K |
|
2147
CALL
ATI
ATI
$27B
| $1.62M | ﹤0.01% |
36,700
-53,000
| -59% | -$2.03M |
|
2148
PUT
Stratasys
SSYS
$697M
| $1.62M | ﹤0.01% |
91,400
+72,700
| +389% | +$1.14M |
|
2149
CALL
Amplify Online Retail ETF
IBUY
$106M
| $1.62M | ﹤0.01% |
68,100
+10,300
| +18% | +$439K |
|
2150
CALL
MACOM Technology Solutions
MTSI
$20.4B
| $1.62M | ﹤0.01% |
24,700
+23,000
| +1,353% | +$1.39M |
|
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.