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 | |
|---|---|---|---|---|---|---|
|
INBX
6801
PUT
DELISTED
Inhibrx, Inc. Common Stock
INBX
| $20K | ﹤0.01% |
800
+700
| +700% | +$16.3K |
|
6802
CALL
Agree Realty
ADC
$9.66B
| $19K | ﹤0.01% |
300
-2,200
| -88% | -$146K |
|
|
ARBK
6803
Argo Blockchain
ARBK
$41.3M
| $19K | ﹤0.01% |
+57
| New | +$16.8K |
|
|
BPT
6804
DELISTED
BP Prudhoe Bay Royalty Trust
BPT
| $19K | ﹤0.01% |
+4,252
| New | +$25.5K |
|
6805
PUT
Brilliant Earth
BRLT
$17.9M
| $19K | ﹤0.01% |
5,000
| – | – |
|
6806
BrightView Holdings
BV
$1.24B
| $19K | ﹤0.01% |
2,774
-19,091
| -87% | -$121K |
|
6807
CALL
Central Garden & Pet Co Class A
CENTA
$2.43B
| $19K | ﹤0.01% |
+625
| New | +$18.1K |
|
6808
CALL
Coherus Oncology
CHRS
$217M
| $19K | ﹤0.01% |
4,500
-11,600
| -72% | -$68.4K |
|
6809
Castor Maritime
CTRM
$18.3M
| $19K | ﹤0.01% |
4,364
+1,162
| +36% | +$6.99K |
|
6810
Definitive Healthcare
DH
$77M
| $19K | ﹤0.01% |
1,792
-1,398
| -44% | -$14.4K |
|
6811
Douglas Elliman
DOUG
$156M
| $19K | ﹤0.01% |
8,766
-6,036
| -41% | -$16.6K |
|
6812
CALL
Enovis
ENOV
$1.74B
| $19K | ﹤0.01% |
+300
| New | +$17.1K |
|
6813
Vertical Aerospace
EVTL
$154M
| $19K | ﹤0.01% |
1,010
-88
| -8% | -$1.66K |
|
6814
Edgewise Therapeutics
EWTX
$4.28B
| $19K | ﹤0.01% |
2,529
-446
| -15% | -$3.76K |
|
6815
CALL
1-800-Flowers.com
FLWS
$252M
| $19K | ﹤0.01% |
2,500
-15,200
| -86% | -$140K |
|
|
GAN
6816
PUT
DELISTED
GAN Ltd
GAN
| $19K | ﹤0.01% |
12,000
+8,300
| +224% | +$11.8K |
|
6817
CALL
GFL Environmental
GFL
$14.5B
| $19K | ﹤0.01% |
500
-72,400
| -99% | -$2.63M |
|
|
GLDD
6818
PUT
DELISTED
Great Lakes Dredge & Dock
GLDD
| $19K | ﹤0.01% |
+2,400
| New | +$15.6K |
|
|
GOGL
6819
DELISTED
Golden Ocean Group
GOGL
| $19K | ﹤0.01% |
2,519
-4,623
| -65% | -$38.5K |
|
6820
CALL
Granite Construction
GVA
$5.16B
| $19K | ﹤0.01% |
500
-3,000
| -86% | -$115K |
|
6821
PUT
Hillman Solutions
HLMN
$1.57B
| $19K | ﹤0.01% |
2,200
+200
| +10% | +$1.67K |
|
|
ITOS
6822
PUT
DELISTED
iTeos Therapeutics
ITOS
| $19K | ﹤0.01% |
1,500
-4,400
| -75% | -$62.7K |
|
6823
iShares Global Energy ETF
IXC
$2.75B
| $19K | ﹤0.01% |
532
-247
| -32% | -$9.3K |
|
6824
CALL
St. Joe Company
JOE
$3.55B
| $19K | ﹤0.01% |
400
-500
| -56% | -$21.8K |
|
6825
CALL
Kemper
KMPR
$1.81B
| $19K | ﹤0.01% |
+400
| New | +$19.4K |
|
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.