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 | |
|---|---|---|---|---|---|---|
2951
CALL
Ericsson
ERIC
$31.8B
| $701K | ﹤0.01% |
128,700
+7,700
| +6% | +$41.3K |
|
2952
PUT
Oshkosh
OSK
$9.66B
| $701K | ﹤0.01% |
8,100
+7,600
| +1,520% | +$599K |
|
2953
PUT
Trinity Capital
TRIN
$1.56B
| $701K | ﹤0.01% |
52,900
+6,900
| +15% | +$86.4K |
|
2954
Kodiak Sciences
KOD
$2.62B
| $700K | ﹤0.01% |
101,463
+96,700
| +2,030% | +$591K |
|
2955
Rocket Lab Corp
RKLB
$41.8B
| $700K | ﹤0.01% |
116,707
+74,199
| +175% | +$340K |
|
2956
SIGA Technologies
SIGA
$222M
| $700K | ﹤0.01% |
138,662
+18,576
| +15% | +$106K |
|
2957
Chewy
CHWY
$8.93B
| $699K | ﹤0.01% |
17,732
-123,769
| -87% | -$4.31M |
|
2958
CALL
Ginkgo Bioworks
DNA
$487M
| $699K | ﹤0.01% |
9,403
-1,107
| -11% | -$65.5K |
|
2959
PUT
Polestar Automotive Holding UK
PSNY
$2.04B
| $698K | ﹤0.01% |
6,093
-240
| -4% | -$25.9K |
|
2960
PUT
Joby Aviation
JOBY
$7.25B
| $697K | ﹤0.01% |
68,000
+8,900
| +15% | +$48.2K |
|
2961
CALL
Oceaneering
OII
$5.19B
| $697K | ﹤0.01% |
37,300
+6,000
| +19% | +$103K |
|
2962
CALL
Radian Group
RDN
$5.18B
| $697K | ﹤0.01% |
27,600
+5,800
| +27% | +$143K |
|
2963
Algonquin Power & Utilities
AQN
$4.63B
| $696K | ﹤0.01% |
84,316
+41,379
| +96% | +$352K |
|
2964
PUT
MasTec
MTZ
$26.6B
| $696K | ﹤0.01% |
5,900
-13,500
| -70% | -$1.32M |
|
2965
Protagonist Therapeutics
PTGX
$8.72B
| $696K | ﹤0.01% |
25,214
-37,845
| -60% | -$947K |
|
2966
Rockwell Automation
ROK
$51.9B
| $696K | ﹤0.01% |
+2,113
| New | +$610K |
|
2967
Teradata
TDC
$2.8B
| $696K | ﹤0.01% |
13,041
+4,877
| +60% | +$220K |
|
2968
PUT
iShares Gold Trust
IAU
$63.4B
| $695K | ﹤0.01% |
19,100
+7,400
| +63% | +$277K |
|
2969
CALL
MBIA
MBI
$282M
| $695K | ﹤0.01% |
80,500
-46,300
| -37% | -$417K |
|
2970
PUT
PagSeguro Digital
PAGS
$2.62B
| $695K | ﹤0.01% |
73,700
+18,700
| +34% | +$190K |
|
2971
CALL
Helmerich & Payne
HP
$3.36B
| $694K | ﹤0.01% |
19,600
-3,900
| -17% | -$133K |
|
2972
CALL
Iovance Biotherapeutics
IOVA
$2.19B
| $694K | ﹤0.01% |
98,700
+83,500
| +549% | +$598K |
|
|
ABB
2973
CALL
DELISTED
ABB Ltd
ABB
| $692K | ﹤0.01% |
17,600
-80,500
| -82% | -$2.87M |
|
|
PGTI
2974
PUT
DELISTED
PGT, Inc.
PGTI
| $690K | ﹤0.01% |
23,700
+18,400
| +347% | +$485K |
|
2975
PUT
Comstock Resources
CRK
$3.82B
| $689K | ﹤0.01% |
59,400
-29,400
| -33% | -$306K |
|
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.