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 | |
|---|---|---|---|---|---|---|
5026
RBB Bancorp
RBB
$448M
| $105K | ﹤0.01% |
8,834
+8,830
| +220,750% | +$106K |
|
5027
PUT
Regenxbio
RGNX
$616M
| $105K | ﹤0.01% |
5,300
+900
| +20% | +$17.3K |
|
5028
Titan Machinery
TITN
$420M
| $105K | ﹤0.01% |
3,566
-250
| -7% | -$7.54K |
|
5029
CALL
Turning Point Brands
TPB
$1.48B
| $105K | ﹤0.01% |
4,400
+2,100
| +91% | +$47.2K |
|
5030
CALL
Vericel Corp
VCEL
$2.38B
| $105K | ﹤0.01% |
2,800
+800
| +40% | +$26.3K |
|
5031
Vertex Pharmaceuticals
VRTX
$123B
| $105K | ﹤0.01% |
300
-9,490
| -97% | -$3.2M |
|
|
SUM
5032
DELISTED
Summit Materials, Inc. Class A Common Stock
SUM
| $105K | ﹤0.01% |
+2,783
| New | +$86.2K |
|
|
DMTK
5033
CALL
DELISTED
DermTech, Inc. Common Stock
DMTK
| $105K | ﹤0.01% |
40,500
-19,500
| -33% | -$58.3K |
|
5034
PUT
Atmos Energy
ATO
$29.7B
| $104K | ﹤0.01% |
900
+600
| +200% | +$69.4K |
|
5035
ProShares UltraShort Dow 30
DXD
$43.6M
| $104K | ﹤0.01% |
2,586
-1,508
| -37% | -$63.5K |
|
5036
Editas Medicine
EDIT
$399M
| $104K | ﹤0.01% |
12,656
+7,360
| +139% | +$64.1K |
|
5037
PUT
1-800-Flowers.com
FLWS
$252M
| $104K | ﹤0.01% |
13,400
-6,200
| -32% | -$56.9K |
|
5038
PUT
Envista
NVST
$4.62B
| $104K | ﹤0.01% |
3,100
-6,500
| -68% | -$229K |
|
|
ORGN
5039
CALL
DELISTED
Origin Materials
ORGN
| $104K | ﹤0.01% |
820
-467
| -36% | -$60.1K |
|
5040
PUT
Procore
PCOR
$7.57B
| $104K | ﹤0.01% |
1,600
-1,700
| -52% | -$100K |
|
5041
PUT
Americold
COLD
$4.21B
| $103K | ﹤0.01% |
3,200
-5,400
| -63% | -$161K |
|
5042
DTE Energy
DTE
$29.9B
| $103K | ﹤0.01% |
+941
| New | +$105K |
|
|
AGNT
5043
PUT
AGNT Inc
AGNT
$629M
| $103K | ﹤0.01% |
5,100
-600
| -11% | -$8.97K |
|
5044
PUT
Federated Hermes
FHI
$4.56B
| $103K | ﹤0.01% |
2,900
+2,600
| +867% | +$100K |
|
5045
iShares S&P GSCI Commodity-Indexed Trust
GSG
$1B
| $103K | ﹤0.01% |
5,331
-2,359
| -31% | -$46.4K |
|
5046
PUT
Herbalife
HLF
$1.3B
| $103K | ﹤0.01% |
7,800
-75,000
| -91% | -$1.02M |
|
5047
iShares US Energy ETF
IYE
$1.72B
| $103K | ﹤0.01% |
2,408
+173
| +8% | +$7.41K |
|
|
RJET
5048
CALL
Republic Airways Holdings
RJET
$845M
| $103K | ﹤0.01% |
2,713
-4,500
| -62% | -$138K |
|
|
MFA
5049
PUT
MFA Financial
MFA
$932M
| $103K | ﹤0.01% |
9,200
+3,100
| +51% | +$33K |
|
5050
PUT
Omnicell
OMCL
$1.88B
| $103K | ﹤0.01% |
1,400
-3,300
| -70% | -$223K |
|
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.