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 | |
|---|---|---|---|---|---|---|
5776
CALL
ALX Oncology
ALXO
$261M
| $53K | ﹤0.01% |
7,100
+3,200
| +82% | +$20.9K |
|
5777
PUT
Ardmore Shipping
ASC
$710M
| $53K | ﹤0.01% |
4,300
-12,900
| -75% | -$172K |
|
5778
PUT
Atossa Therapeutics
ATOS
$20.6M
| $53K | ﹤0.01% |
2,820
| – | – |
|
5779
PUT
Aviat Networks
AVNW
$265M
| $53K | ﹤0.01% |
1,600
+1,200
| +300% | +$38.2K |
|
5780
Breakwave Dry Bulk Shipping ETF
BDRY
$29.5M
| $53K | ﹤0.01% |
9,586
+2,821
| +42% | +$21.4K |
|
|
CAN
5781
Canaan Creative
CAN
$127M
| $53K | ﹤0.01% |
+25,072
| New | +$60.7K |
|
5782
CALL
C4 Therapeutics
CCCC
$385M
| $53K | ﹤0.01% |
19,500
-3,600
| -16% | -$11.6K |
|
5783
CALL
Clarus
CLAR
$123M
| $53K | ﹤0.01% |
5,900
-700
| -11% | -$6.18K |
|
5784
CALL
Denali Therapeutics
DNLI
$3.65B
| $53K | ﹤0.01% |
1,800
-4,100
| -69% | -$115K |
|
5785
CALL
FTC Solar
FTCI
$44M
| $53K | ﹤0.01% |
1,670
+1,440
| +626% | +$39.6K |
|
5786
StealthGas
GASS
$332M
| $53K | ﹤0.01% |
12,517
+3,102
| +33% | +$9.39K |
|
5787
CALL
Globus Maritime Ltd
GLBS
$61.9M
| $53K | ﹤0.01% |
59,400
+300
| +0.5% | +$293 |
|
5788
PUT
Hayward Holdings
HAYW
$3.21B
| $53K | ﹤0.01% |
4,200
+2,400
| +133% | +$27.7K |
|
5789
CALL
InfuSystem Holdings
INFU
$184M
| $53K | ﹤0.01% |
+5,600
| New | +$50.7K |
|
5790
PUT
Disc Medicine
IRON
$2.94B
| $53K | ﹤0.01% |
+1,200
| New | +$42.6K |
|
5791
Kite Realty
KRG
$5.81B
| $53K | ﹤0.01% |
+2,401
| New | +$49.5K |
|
|
LPRO
5792
PUT
Open Lending Corp
LPRO
| $53K | ﹤0.01% |
5,100
+3,600
| +240% | +$31.8K |
|
5793
M/I Homes
MHO
$3.74B
| $53K | ﹤0.01% |
+610
| New | +$43.2K |
|
5794
CALL
PDS Biotechnology
PDSB
$38.4M
| $53K | ﹤0.01% |
10,700
-13,400
| -56% | -$87.8K |
|
5795
CALL
Purple Innovation
PRPL
$35.3M
| $53K | ﹤0.01% |
764
+572
| +298% | +$41.2K |
|
5796
CALL
Travere Therapeutics
TVTX
$5.2B
| $53K | ﹤0.01% |
3,500
-3,600
| -51% | -$65.5K |
|
5797
ABM Industries
ABM
$2.81B
| $52K | ﹤0.01% |
1,237
+1,095
| +771% | +$47.5K |
|
5798
CALL
ClearPoint Neuro
CLPT
$448M
| $52K | ﹤0.01% |
7,300
+1,900
| +35% | +$16.2K |
|
5799
Direxion Daily Real Estate Bear 3X ETF
DRV
$26.5M
| $52K | ﹤0.01% |
+1,158
| New | +$58K |
|
5800
CALL
Eton Pharmaceutcials
ETON
$1.27B
| $52K | ﹤0.01% |
15,000
+6,100
| +69% | +$22.4K |
|
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.