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 | Miscellaneous | 98.43% |
| 2 | Technology | 0.41% |
| 3 | Healthcare | 0.21% |
| 4 | Consumer Discretionary | 0.21% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1626
CALL
Samsara
IOT
$23B
| $3.15M | ﹤0.01% |
113,600
-33,300
| -23% | -$738K |
|
1627
CALL
Thor Industries
THO
$3.83B
| $3.15M | ﹤0.01% |
30,400
+10,000
| +49% | +$845K |
|
1628
CALL
TechnipFMC
FTI
$30.7B
| $3.14M | ﹤0.01% |
188,900
-152,200
| -45% | -$2.15M |
|
1629
CALL
Equifax
EFX
$20.1B
| $3.13M | ﹤0.01% |
13,300
+11,400
| +600% | +$2.4M |
|
1630
Etsy
ETSY
$6.6B
| $3.12M | ﹤0.01% |
+36,931
| New | +$3.48M |
|
1631
PUT
Eastman Chemical
EMN
$8.02B
| $3.12M | ﹤0.01% |
37,300
+8,900
| +31% | +$724K |
|
|
KRTX
1632
PUT
DELISTED
Karuna Therapeutics, Inc. Common Stock
KRTX
| $3.12M | ﹤0.01% |
14,400
+2,900
| +25% | +$621K |
|
1633
General Mills
GIS
$19.8B
| $3.12M | ﹤0.01% |
40,633
-135,783
| -77% | -$11.6M |
|
1634
PUT
ING
ING
$106B
| $3.1M | ﹤0.01% |
230,300
-48,800
| -17% | -$624K |
|
1635
PUT
MP Materials
MP
$9.95B
| $3.1M | ﹤0.01% |
135,600
-138,500
| -51% | -$3.17M |
|
1636
PUT
Sweetgreen
SG
$794M
| $3.1M | ﹤0.01% |
241,600
+73,000
| +43% | +$675K |
|
1637
CALL
TE Connectivity
TEL
$59.8B
| $3.1M | ﹤0.01% |
22,100
+19,600
| +784% | +$2.48M |
|
1638
CALL
Reliance Steel & Aluminium
RS
$20.4B
| $3.1M | ﹤0.01% |
11,400
-10,700
| -48% | -$2.65M |
|
|
CNR
1639
CALL
Core Natural Resources Inc
CNR
$4.98B
| $3.09M | ﹤0.01% |
45,600
+8,800
| +24% | +$537K |
|
|
1640
PUT
Samsara
IOT
$23B
| $3.09M | ﹤0.01% |
111,500
-72,900
| -40% | -$1.62M |
|
1641
Northrop Grumman
NOC
$73.9B
| $3.08M | ﹤0.01% |
+6,763
| New | +$3.07M |
|
1642
CALL
Array Technologies
ARRY
$745M
| $3.08M | ﹤0.01% |
136,300
+61,200
| +81% | +$1.31M |
|
1643
PUT
Viking Therapeutics
VKTX
$3.96B
| $3.07M | ﹤0.01% |
189,600
+136,400
| +256% | +$2.86M |
|
1644
Cenovus Energy
CVE
$61.6B
| $3.06M | ﹤0.01% |
180,469
+106,156
| +143% | +$1.79M |
|
1645
PUT
Impinj
PI
$5.31B
| $3.06M | ﹤0.01% |
34,100
+30,400
| +822% | +$3.24M |
|
1646
PUT
Waters Corp
WAT
$39.8B
| $3.04M | ﹤0.01% |
11,400
+5,400
| +90% | +$1.5M |
|
1647
PUT
Invesco S&P SmallCap Low Volatility ETF
XSLV
$251M
| $3.03M | ﹤0.01% |
81,500
+4,000
| +5% | +$162K |
|
1648
CALL
Newell Brands
NWL
$2.71B
| $3.02M | ﹤0.01% |
347,300
+186,400
| +116% | +$1.85M |
|
1649
CALL
StoneCo
STNE
$2.34B
| $3.02M | ﹤0.01% |
236,900
+61,000
| +35% | +$761K |
|
1650
CALL
Constellation Energy
CEG
$107B
| $3M | ﹤0.01% |
32,800
+19,900
| +154% | +$1.65M |
|
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, 3,349 increased, 3,911 reduced and 1,518 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 Miscellaneous at 98% of assets, down from 99% a quarter earlier, followed by Technology and Healthcare.
- 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 1,518 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.