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 | |
|---|---|---|---|---|---|---|
|
RJET
4451
Republic Airways Holdings
RJET
$845M
| $174K | ﹤0.01% |
+4,574
| New | +$140K |
|
4452
Patterson-UTI
PTEN
$3.54B
| $174K | ﹤0.01% |
+14,538
| New | +$164K |
|
4453
CALL
Qfin Holdings
QFIN
$1.68B
| $174K | ﹤0.01% |
10,100
-1,100
| -10% | -$18.5K |
|
|
RVPH
4454
CALL
DELISTED
REVIVA PHARMA HLDGS INC
RVPH
| $174K | ﹤0.01% |
1,490
-1,285
| -46% | -$163K |
|
4455
PUT
Sunstone Hotel Investors
SHO
$2.19B
| $174K | ﹤0.01% |
17,200
+17,000
| +8,500% | +$169K |
|
4456
PUT
Trimble
TRMB
$13.6B
| $174K | ﹤0.01% |
3,300
+1,000
| +43% | +$48.9K |
|
4457
CALL
Zentalis Pharmaceuticals
ZNTL
$332M
| $174K | ﹤0.01% |
6,200
+1,500
| +32% | +$36K |
|
4458
InfraCap MLP ETF
AMZA
$466M
| $173K | ﹤0.01% |
+5,233
| New | +$169K |
|
4459
PUT
American Resources Corp
AREC
$183M
| $173K | ﹤0.01% |
88,700
-77,700
| -47% | -$119K |
|
|
CIM
4460
PUT
Chimera Investment
CIM
$1.06B
| $173K | ﹤0.01% |
10,033
-8,600
| -46% | -$137K |
|
|
CTLP
4461
CALL
DELISTED
Cantaloupe
CTLP
| $173K | ﹤0.01% |
21,800
-223,900
| -91% | -$1.45M |
|
4462
CALL
Dorman Products
DORM
$4.22B
| $173K | ﹤0.01% |
2,200
| – | – |
|
4463
PUT
Invesco
IVZ
$12.4B
| $173K | ﹤0.01% |
10,300
| – | – |
|
4464
CALL
Mitek Systems
MITK
$756M
| $173K | ﹤0.01% |
16,000
-1,800
| -10% | -$17.6K |
|
4465
PUT
Webster Financial
WBS
$12.3B
| $173K | ﹤0.01% |
4,600
+2,500
| +119% | +$92.3K |
|
|
ERF
4466
PUT
DELISTED
Enerplus Corporation
ERF
| $173K | ﹤0.01% |
12,000
-30,300
| -72% | -$442K |
|
4467
CALL
CareTrust REIT
CTRE
$10B
| $172K | ﹤0.01% |
8,700
-7,900
| -48% | -$154K |
|
4468
CALL
Fortune Brands Innovations
FBIN
$5.86B
| $172K | ﹤0.01% |
2,400
+1,000
| +71% | +$63.6K |
|
4469
CALL
Standard Motor Products
SMP
$902M
| $172K | ﹤0.01% |
4,600
-100
| -2% | -$3.65K |
|
4470
PUT
Sterling Infrastructure
STRL
$15.2B
| $172K | ﹤0.01% |
3,100
+100
| +3% | +$4.43K |
|
|
LICY
4471
PUT
DELISTED
Li-Cycle Holdings Corp.
LICY
| $172K | ﹤0.01% |
3,875
-3,100
| -44% | -$127K |
|
|
GRTX
4472
CALL
DELISTED
Galera Therapeutics, Inc. Common Stock
GRTX
| $172K | ﹤0.01% |
55,200
-216,500
| -80% | -$644K |
|
|
BLU
4473
DELISTED
BELLUS Health Inc.
BLU
| $172K | ﹤0.01% |
11,722
+5,545
| +90% | +$73.6K |
|
4474
Cosmos Holdings
COSM
$11.3M
| $171K | ﹤0.01% |
+57,446
| New | +$189K |
|
|
FINV
4475
CALL
FinVolution Group
FINV
$1.17B
| $171K | ﹤0.01% |
37,200
-26,400
| -42% | -$109K |
|
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.