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 | |
|---|---|---|---|---|---|---|
5726
PUT
Glaukos
GKOS
$9.83B
| $56K | ﹤0.01% |
800
+400
| +100% | +$23K |
|
5727
CALL
ESS Tech
GWH
$22M
| $56K | ﹤0.01% |
2,580
+1,260
| +95% | +$22.8K |
|
5728
D-Wave Quantum Inc. Common Stock
QBTS
$6.7B
| $56K | ﹤0.01% |
27,261
+2,750
| +11% | +$3.03K |
|
|
RDUS
5729
PUT
DELISTED
Radius Recycling
RDUS
| $56K | ﹤0.01% |
1,900
-2,100
| -53% | -$63.1K |
|
5730
Raymond James Financial
RJF
$33.8B
| $56K | ﹤0.01% |
+548
| New | +$50.9K |
|
5731
TETRA Technologies
TTI
$1.14B
| $56K | ﹤0.01% |
16,712
-75,772
| -82% | -$219K |
|
5732
CALL
Titan International
TWI
$466M
| $56K | ﹤0.01% |
4,900
-1,800
| -27% | -$19.1K |
|
|
TSP
5733
CALL
DELISTED
TuSimple Holdings Inc. Class A Common Stock
TSP
| $56K | ﹤0.01% |
34,200
+30,800
| +906% | +$49.8K |
|
|
SDC
5734
PUT
DELISTED
SmileDirectClub, Inc. Class A Common Stock
SDC
| $56K | ﹤0.01% |
107,300
+2,000
| +2% | +$816 |
|
|
PDCE
5735
PUT
DELISTED
PDC Energy, Inc.
PDCE
| $56K | ﹤0.01% |
800
-500
| -38% | -$33.8K |
|
5736
Arbe Robotics
ARBE
$80.3M
| $55K | ﹤0.01% |
19,148
-16,884
| -47% | -$42.1K |
|
|
BASE
5737
CALL
DELISTED
Couchbase
BASE
| $55K | ﹤0.01% |
3,500
+3,100
| +775% | +$50.7K |
|
|
DRD
5738
DRDGold
DRD
$1.77B
| $55K | ﹤0.01% |
+5,209
| New | +$59.1K |
|
|
LKFT
5739
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.78B
| $55K | ﹤0.01% |
1,355
-6,249
| -82% | -$255K |
|
|
GMS
5740
PUT
DELISTED
GMS Inc
GMS
| $55K | ﹤0.01% |
800
| – | – |
|
5741
PUT
Grocery Outlet
GO
$909M
| $55K | ﹤0.01% |
1,800
+900
| +100% | +$26.3K |
|
5742
Green Brick Partners
GRBK
$3.04B
| $55K | ﹤0.01% |
+972
| New | +$45.2K |
|
|
ITOS
5743
CALL
DELISTED
iTeos Therapeutics
ITOS
| $55K | ﹤0.01% |
4,200
+3,100
| +282% | +$44.2K |
|
5744
PUT
ITT
ITT
$17.5B
| $55K | ﹤0.01% |
600
+100
| +20% | +$8.4K |
|
|
NVEE
5745
CALL
DELISTED
NV5 Global
NVEE
| $55K | ﹤0.01% |
2,000
-6,000
| -75% | -$147K |
|
5746
PUT
Puma Biotechnology
PBYI
$404M
| $55K | ﹤0.01% |
15,600
-10,500
| -40% | -$32.8K |
|
5747
PUT
Phathom Pharmaceuticals
PHAT
$708M
| $55K | ﹤0.01% |
3,900
+3,600
| +1,200% | +$41.5K |
|
|
PRPH
5748
PUT
DELISTED
ProPhase Labs
PRPH
| $55K | ﹤0.01% |
770
+570
| +285% | +$46.4K |
|
5749
Paysafe
PSFE
$414M
| $55K | ﹤0.01% |
+5,468
| New | +$69.2K |
|
5750
CALL
Sabesp
SBS
$19.1B
| $55K | ﹤0.01% |
24,236
-93,848
| -79% | -$188K |
|
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.