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 | |
|---|---|---|---|---|---|---|
|
HITI
5801
High Tide
HITI
$186M
| $52K | ﹤0.01% |
+42,661
| New | +$55.4K |
|
5802
PUT
Malibu Boats
MBUU
$541M
| $52K | ﹤0.01% |
900
-300
| -25% | -$16.8K |
|
|
PLG
5803
PUT
Platinum Group Metals
PLG
$164M
| $52K | ﹤0.01% |
37,100
+32,200
| +657% | +$49.2K |
|
5804
CALL
Senseonics Holdings Inc
SENS
$263M
| $52K | ﹤0.01% |
3,410
-3,380
| -50% | -$46.3K |
|
5805
PUT
Summit Therapeutics
SMMT
$10.4B
| $52K | ﹤0.01% |
20,900
-16,600
| -44% | -$30.3K |
|
5806
PUT
Tronox
TROX
$932M
| $52K | ﹤0.01% |
4,100
-700
| -15% | -$8.8K |
|
|
XXII
5807
PUT
22nd Century Group
XXII
$1.38M
| – | – |
0
| – | – |
|
|
LUCK
5808
PUT
Lucky Strike Entertainment
LUCK
$914M
| $52K | ﹤0.01% |
4,500
-5,500
| -55% | -$73.3K |
|
|
EGIO
5809
DELISTED
Edgio, Inc. Common Stock
EGIO
| $52K | ﹤0.01% |
1,948
+945
| +94% | +$22.3K |
|
|
SBDS
5810
CALL
DELISTED
Solo Brands Inc
SBDS
| $52K | ﹤0.01% |
233
-42
| -15% | -$10.4K |
|
|
BPT
5811
CALL
DELISTED
BP Prudhoe Bay Royalty Trust
BPT
| $51K | ﹤0.01% |
11,300
-200
| -2% | -$1.2K |
|
5812
PUT
Customers Bancorp
CUBI
$2.66B
| $51K | ﹤0.01% |
1,700
-6,700
| -80% | -$150K |
|
5813
CALL
GATX Corp
GATX
$6.35B
| $51K | ﹤0.01% |
+400
| New | +$46.8K |
|
5814
PUT
Golub Capital BDC
GBDC
$3.34B
| $51K | ﹤0.01% |
3,800
+2,800
| +280% | +$37.2K |
|
5815
CALL
Gildan
GIL
$10.3B
| $51K | ﹤0.01% |
1,600
+700
| +78% | +$21.5K |
|
5816
PUT
Green Brick Partners
GRBK
$3.04B
| $51K | ﹤0.01% |
900
+300
| +50% | +$14K |
|
5817
CALL
IDEAYA Biosciences
IDYA
$3.42B
| $51K | ﹤0.01% |
2,200
+1,800
| +450% | +$37K |
|
5818
CALL
Immunic
IMUX
$190M
| $51K | ﹤0.01% |
2,050
+800
| +64% | +$13.4K |
|
|
LPRO
5819
CALL
Open Lending Corp
LPRO
| $51K | ﹤0.01% |
4,900
+3,600
| +277% | +$31.8K |
|
5820
PUT
NeoGenomics
NEO
$1.96B
| $51K | ﹤0.01% |
3,200
-21,500
| -87% | -$354K |
|
5821
PUT
Saratoga Investment
SAR
$312M
| $51K | ﹤0.01% |
1,900
| – | – |
|
5822
CALL
SCYNEXIS
SCYX
$48.1M
| $51K | ﹤0.01% |
+2,200
| New | +$51.4K |
|
5823
Sumitomo Mitsui Financial
SMFG
$164B
| $51K | ﹤0.01% |
5,948
+24
| +0.4% | +$198 |
|
5824
PUT
Teekay
TK
$1.01B
| $51K | ﹤0.01% |
8,500
-13,100
| -61% | -$76.5K |
|
5825
PUT
Universal Electronics
UEIC
$57.8M
| $51K | ﹤0.01% |
5,400
-400
| -7% | -$3.7K |
|
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.