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 | |
|---|---|---|---|---|---|---|
5601
PUT
Lifestance Health
LFST
$4B
| $62K | ﹤0.01% |
6,900
-14,900
| -68% | -$124K |
|
|
PBT
5602
CALL
Permian Basin Royalty Trust
PBT
$1.38B
| $62K | ﹤0.01% |
2,500
+1,900
| +317% | +$46.9K |
|
5603
CALL
RCM Technologies
RCMT
$201M
| $62K | ﹤0.01% |
3,400
-4,000
| -54% | -$58.5K |
|
5604
Stepan Co
SCL
$1.46B
| $62K | ﹤0.01% |
659
+606
| +1,143% | +$57.6K |
|
|
SKE
5605
PUT
Skeena Resources
SKE
$3.3B
| $62K | ﹤0.01% |
12,900
+9,300
| +258% | +$54.5K |
|
5606
PUT
Worthington Enterprises
WOR
$2.77B
| $62K | ﹤0.01% |
1,460
-1,622
| -53% | -$60.1K |
|
5607
PUT
Metallus
MTUS
$838M
| $62K | ﹤0.01% |
2,900
+2,800
| +2,800% | +$50.7K |
|
5608
AMC Entertainment Holdings
AMC
$2.52B
| $61K | ﹤0.01% |
1,390
+1,120
| +415% | +$55.3K |
|
5609
American Water Works
AWK
$26.7B
| $61K | ﹤0.01% |
428
-3,864
| -90% | -$568K |
|
|
BHR
5610
PUT
Braemar Hotels & Resorts
BHR
$156M
| $61K | ﹤0.01% |
15,200
| – | – |
|
5611
Cars.com
CARS
$662M
| $61K | ﹤0.01% |
3,091
-4,658
| -60% | -$87.6K |
|
5612
CALL
Citi Trends
CTRN
$555M
| $61K | ﹤0.01% |
3,500
+2,200
| +169% | +$37.9K |
|
|
5613
Citi Trends
CTRN
$555M
| $61K | ﹤0.01% |
3,503
-6,895
| -66% | -$119K |
|
5614
CALL
Dream Finders Homes
DFH
$1.17B
| $61K | ﹤0.01% |
+2,500
| New | +$45K |
|
5615
PUT
Innodata
INOD
$2.05B
| $61K | ﹤0.01% |
5,400
+4,100
| +315% | +$38.1K |
|
5616
Itron
ITRI
$4.36B
| $61K | ﹤0.01% |
+859
| New | +$54.3K |
|
5617
PUT
LivaNova
LIVN
$4.4B
| $61K | ﹤0.01% |
+1,200
| New | +$56.3K |
|
5618
CALL
Mativ Holdings
MATV
$481M
| $61K | ﹤0.01% |
4,100
-2,200
| -35% | -$38.9K |
|
5619
MongoDB
MDB
$27.1B
| $61K | ﹤0.01% |
150
-48,168
| -100% | -$14M |
|
5620
Everspin Technologies
MRAM
$341M
| $61K | ﹤0.01% |
+6,667
| New | +$50.2K |
|
|
MRC
5621
PUT
DELISTED
MRC Global
MRC
| $61K | ﹤0.01% |
6,100
-100
| -2% | -$946 |
|
|
NAAS
5622
CALL
NaaS Technology Inc
NAAS
$55.1M
| $61K | ﹤0.01% |
+36
| New | +$88.1K |
|
5623
PUT
Regal Rexnord
RRX
$13.7B
| $61K | ﹤0.01% |
400
-2,000
| -83% | -$272K |
|
5624
PUT
SkinHealth Systems
SKIN
$88.8M
| $61K | ﹤0.01% |
7,300
-200
| -3% | -$2.08K |
|
|
SLI
5625
PUT
Standard Lithium
SLI
$502M
| $61K | ﹤0.01% |
13,600
-2,900
| -18% | -$11.3K |
|
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.