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 | |
|---|---|---|---|---|---|---|
4801
Jones Lang LaSalle
JLL
$15.8B
| $126K | ﹤0.01% |
+815
| New | +$116K |
|
4802
PUT
SkyWater Technology
SKYT
$1.5B
| $126K | ﹤0.01% |
13,400
+1,400
| +12% | +$13.5K |
|
|
SHCR
4803
CALL
DELISTED
Sharecare, Inc. Class A Common Stock
SHCR
| $126K | ﹤0.01% |
72,100
+700
| +1% | +$1.1K |
|
|
EMBK
4804
CALL
DELISTED
Embark Technology, Inc. Common Stock
EMBK
| $126K | ﹤0.01% |
44,300
-17,200
| -28% | -$48.1K |
|
4805
Adecoagro
AGRO
$1.4B
| $125K | ﹤0.01% |
13,432
-22,045
| -62% | -$195K |
|
4806
CALL
Arqit Quantum
ARQQ
$270M
| $125K | ﹤0.01% |
4,144
-660
| -14% | -$19.9K |
|
4807
PUT
Bread Financial
BFH
$4.32B
| $125K | ﹤0.01% |
4,000
-7,600
| -66% | -$218K |
|
4808
PUT
Denison Mines
DNN
$2.43B
| $125K | ﹤0.01% |
100,200
-20,500
| -17% | -$22.8K |
|
4809
Fresenius Medical Care
FMS
$13.4B
| $125K | ﹤0.01% |
5,239
-9,621
| -65% | -$221K |
|
4810
PUT
Leslie's
LESL
$8.33M
| $125K | ﹤0.01% |
670
-20
| -3% | -$4.13K |
|
4811
CALL
Lufax Holding
LU
$1.33B
| $125K | ﹤0.01% |
21,875
-127,075
| -85% | -$840K |
|
|
MRSN
4812
PUT
DELISTED
Mersana Therapeutics
MRSN
| $125K | ﹤0.01% |
1,524
+1,092
| +253% | +$160K |
|
4813
CALL
TFI International
TFII
$11.6B
| $125K | ﹤0.01% |
1,100
-1,400
| -56% | -$154K |
|
4814
CALL
TPG
TPG
$6.76B
| $125K | ﹤0.01% |
4,300
-4,600
| -52% | -$129K |
|
|
SRCL
4815
PUT
DELISTED
Stericycle Inc
SRCL
| $125K | ﹤0.01% |
2,700
+2,200
| +440% | +$96.3K |
|
|
CMLS
4816
PUT
DELISTED
Cumulus Media Inc. Class A Common Stock
CMLS
| $125K | ﹤0.01% |
+30,700
| New | +$103K |
|
|
AEL
4817
CALL
DELISTED
American Equity Investment Life Holding Company
AEL
| $125K | ﹤0.01% |
2,400
+2,200
| +1,100% | +$88.4K |
|
|
DICE
4818
CALL
DELISTED
DICE Therapeutics, Inc. Common Stock
DICE
| $125K | ﹤0.01% |
2,700
+800
| +42% | +$27.7K |
|
4819
PUT
Atkore
ATKR
$2.41B
| $124K | ﹤0.01% |
800
-900
| -53% | -$118K |
|
4820
CALL
Columbia Financial
CLBK
$1.14B
| $124K | ﹤0.01% |
+7,200
| New | +$125K |
|
4821
PUT
FuelCell Energy
FCEL
$1.45B
| $124K | ﹤0.01% |
1,927
+310
| +19% | +$21K |
|
4822
CALL
Flywire
FLYW
$2.04B
| $124K | ﹤0.01% |
4,000
+3,900
| +3,900% | +$117K |
|
4823
PUT
Loews
L
$24.5B
| $124K | ﹤0.01% |
2,100
-70,000
| -97% | -$4.05M |
|
4824
CALL
Mercury Insurance
MCY
$6B
| $124K | ﹤0.01% |
4,100
-400
| -9% | -$12.2K |
|
4825
PUT
Fidelity Nasdaq Composite Index ETF
ONEQ
$9.97B
| $124K | ﹤0.01% |
+2,300
| New | +$114K |
|
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.