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 | |
|---|---|---|---|---|---|---|
|
BELFB
5701
CALL
Bel Fuse Inc Class B
BELFB
$3.87B
| $57K | ﹤0.01% |
+1,000
| New | +$45.8K |
|
5702
CALL
Cellebrite
CLBT
$3.68B
| $57K | ﹤0.01% |
8,000
-10,300
| -56% | -$60.1K |
|
5703
Invesco DB Oil Fund
DBO
$403M
| $57K | ﹤0.01% |
4,093
+2,861
| +232% | +$41K |
|
|
DX
5704
CALL
Dynex Capital
DX
$3.15B
| $57K | ﹤0.01% |
4,600
-19,500
| -81% | -$228K |
|
5705
CALL
Ligand Pharmaceuticals
LGND
$5.76B
| $57K | ﹤0.01% |
800
-100
| -11% | -$7.5K |
|
5706
PUT
Mercury Insurance
MCY
$5.93B
| $57K | ﹤0.01% |
1,900
+1,100
| +138% | +$33.6K |
|
|
NINE
5707
PUT
DELISTED
Nine Energy Service
NINE
| $57K | ﹤0.01% |
15,100
+3,800
| +34% | +$14.6K |
|
5708
CALL
PRA Group
PRAA
$663M
| $57K | ﹤0.01% |
+2,500
| New | +$69.3K |
|
5709
Redwire
RDW
$2.06B
| $57K | ﹤0.01% |
22,423
-24,296
| -52% | -$66.2K |
|
5710
PUT
Relay Therapeutics
RLAY
$4.1B
| $57K | ﹤0.01% |
4,600
-1,500
| -25% | -$18.7K |
|
5711
PUT
Recursion Pharmaceuticals
RXRX
$1.59B
| $57K | ﹤0.01% |
7,700
+6,000
| +353% | +$42K |
|
5712
CALL
Simplify US Equity PLUS Convexity ETF
SPYC
$112M
| $57K | ﹤0.01% |
2,500
+2,300
| +1,150% | +$63.3K |
|
5713
Taboola.com
TBLA
$1.37B
| $57K | ﹤0.01% |
18,514
-22,830
| -55% | -$62.5K |
|
|
VRNA
5714
PUT
DELISTED
Verona Pharma
VRNA
| $57K | ﹤0.01% |
2,700
-4,200
| -61% | -$89.6K |
|
5715
CALL
Xometry
XMTR
$4.74B
| $57K | ﹤0.01% |
2,700
-23,400
| -90% | -$409K |
|
|
VLD
5716
CALL
DELISTED
Velo3D, Inc.
VLD
| $57K | ﹤0.01% |
763
-463
| -38% | -$32.3K |
|
5717
PUT
American Homes 4 Rent
AMH
$12B
| $56K | ﹤0.01% |
+1,600
| New | +$54.2K |
|
5718
CALL
Brighthouse Financial
BHF
$3.56B
| $56K | ﹤0.01% |
1,200
-15,900
| -93% | -$685K |
|
5719
Bentley Systems
BSY
$10.8B
| $56K | ﹤0.01% |
+1,039
| New | +$48.5K |
|
5720
CALL
CPS Technologies
CPSH
$75.5M
| $56K | ﹤0.01% |
20,100
+2,800
| +16% | +$8.09K |
|
5721
CALL
Donaldson
DCI
$10.9B
| $56K | ﹤0.01% |
+900
| New | +$56.3K |
|
5722
CALL
Franklin Covey
FC
$242M
| $56K | ﹤0.01% |
1,300
+400
| +44% | +$14.8K |
|
5723
CALL
Fidus Investment
FDUS
$749M
| $56K | ﹤0.01% |
2,900
-12,900
| -82% | -$245K |
|
5724
Fulton Financial
FULT
$4.66B
| $56K | ﹤0.01% |
+4,707
| New | +$56.8K |
|
5725
Gildan
GIL
$10.3B
| $56K | ﹤0.01% |
1,752
-58
| -3% | -$1.78K |
|
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.