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 | |
|---|---|---|---|---|---|---|
4726
Frontier Group Holdings
ULCC
$1.5B
| $136K | ﹤0.01% |
14,133
+10,962
| +346% | +$98.5K |
|
|
ONC
4727
BeOne Medicines Ltd
ONC
$33.9B
| $136K | ﹤0.01% |
+768
| New | +$177K |
|
|
BCLI
4728
CALL
DELISTED
BRAINSTORM CELL THERAPUTC
BCLI
| $135K | ﹤0.01% |
4,387
+2,087
| +91% | +$86.5K |
|
4729
Embecta
EMBC
$218M
| $135K | ﹤0.01% |
6,265
+2,855
| +84% | +$77.8K |
|
4730
CALL
Dorian LPG
LPG
$1.96B
| $135K | ﹤0.01% |
5,300
+1,800
| +51% | +$40.9K |
|
4731
CALL
MacroGenics
MGNX
$233M
| $135K | ﹤0.01% |
25,400
-9,100
| -26% | -$56.1K |
|
4732
PUT
Ryder
R
$9.9B
| $135K | ﹤0.01% |
1,600
-100
| -6% | -$8.23K |
|
|
SLI
4733
CALL
Standard Lithium
SLI
$475M
| $135K | ﹤0.01% |
30,000
+23,400
| +355% | +$91.1K |
|
4734
Direxion Daily Small Cap Bear 3x ETF
TZA
$257M
| $135K | ﹤0.01% |
514
-3,979
| -89% | -$1.24M |
|
4735
2x Long VIX Futures ETF
UVIX
$300M
| $135K | ﹤0.01% |
15
+3
| +25% | +$58.4K |
|
4736
Viper Energy
VNOM
$8.43B
| $135K | ﹤0.01% |
5,067
+4,869
| +2,459% | +$133K |
|
4737
PUT
Verisk Analytics
VRSK
$27.7B
| $135K | ﹤0.01% |
600
-5,200
| -90% | -$1.09M |
|
4738
PUT
Arch Capital
ACGL
$35.7B
| $134K | ﹤0.01% |
1,800
-5,000
| -74% | -$362K |
|
4739
Cohu
COHU
$1.86B
| $134K | ﹤0.01% |
+3,237
| New | +$119K |
|
4740
Amplify Alternative Harvest ETF
MJ
$96.9M
| $134K | ﹤0.01% |
3,759
-642
| -15% | -$24.7K |
|
4741
PharmaCyte Biotech
PMCB
$6.29M
| $134K | ﹤0.01% |
47,149
-86,051
| -65% | -$258K |
|
4742
Direxion Daily CSI China Internet Index Bull 2X ETF
CWEB
$242M
| $133K | ﹤0.01% |
3,717
+347
| +10% | +$13.7K |
|
|
HDSN
4743
CALL
Hudson Technologies
HDSN
$246M
| $133K | ﹤0.01% |
13,900
+1,000
| +8% | +$8.69K |
|
4744
CALL
IAMGOLD
IAG
$8.05B
| $133K | ﹤0.01% |
50,700
+24,500
| +94% | +$70.9K |
|
4745
CALL
iBio
IBIO
$67.6M
| $133K | ﹤0.01% |
10,920
-695
| -6% | -$13.1K |
|
4746
Relay Therapeutics
RLAY
$4B
| $133K | ﹤0.01% |
10,592
+2,509
| +31% | +$31.2K |
|
|
NAPA
4747
CALL
DELISTED
The Duckhorn Portfolio, Inc.
NAPA
| $133K | ﹤0.01% |
10,300
+2,400
| +30% | +$34K |
|
4748
Immunome
IMNM
$2.62B
| $132K | ﹤0.01% |
16,804
+10,381
| +162% | +$56.8K |
|
|
ACH
4749
Accendra Health
ACH
$254M
| $132K | ﹤0.01% |
+6,952
| New | +$124K |
|
4750
CALL
Patria Investments
PAX
$1.72B
| $132K | ﹤0.01% |
9,300
+5,700
| +158% | +$84.7K |
|
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.