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 | |
|---|---|---|---|---|---|---|
6901
CALL
Allogene Therapeutics
ALLO
$635M
| $17K | ﹤0.01% |
3,500
-12,600
| -78% | -$68.2K |
|
6902
PUT
America Movil
AMX
$75.1B
| $17K | ﹤0.01% |
800
-300
| -27% | -$6.51K |
|
6903
CALL
Annexon
ANNX
$813M
| $17K | ﹤0.01% |
5,100
+3,600
| +240% | +$15.7K |
|
6904
PUT
AppFolio
APPF
$6.64B
| $17K | ﹤0.01% |
+100
| New | +$14.6K |
|
6905
Anterix
ATEX
$1.77B
| $17K | ﹤0.01% |
565
-4,503
| -89% | -$146K |
|
6906
PUT
American States Water
AWR
$3.42B
| $17K | ﹤0.01% |
+200
| New | +$17.9K |
|
6907
Black Hills Corp
BKH
$5.57B
| $17K | ﹤0.01% |
+298
| New | +$18.9K |
|
|
BRKL
6908
CALL
DELISTED
Brookline Bancorp
BRKL
| $17K | ﹤0.01% |
2,000
+1,000
| +100% | +$9.12K |
|
|
SLAI
6909
CALL
DELISTED
SOLAI Ltd ADS
SLAI
| $17K | ﹤0.01% |
900
-200
| -18% | -$3.87K |
|
|
CADE
6910
PUT
DELISTED
Cadence Bank
CADE
| $17K | ﹤0.01% |
+900
| New | +$17.8K |
|
|
CCC
6911
CCC Intelligent Solutions
CCC
$3.56B
| $17K | ﹤0.01% |
+1,535
| New | +$15.1K |
|
|
CLSD
6912
PUT
DELISTED
Clearside Biomedical
CLSD
| $17K | ﹤0.01% |
1,020
+33
| +3% | +$568 |
|
|
CMPS
6913
Compass Pathways
CMPS
$1.49B
| $17K | ﹤0.01% |
+2,127
| New | +$18.1K |
|
6914
Comtech Telecommunications
CMTL
$50.3M
| $17K | ﹤0.01% |
1,880
+1,459
| +347% | +$15.7K |
|
6915
CALL
Champions Oncology
CSBR
$75.9M
| $17K | ﹤0.01% |
2,800
+1,800
| +180% | +$9.29K |
|
6916
CALL
Dimensional US Core Equity Market ETF
DFAU
$12.2B
| $17K | ﹤0.01% |
700
-300
| -30% | -$8.8K |
|
6917
PUT
Dole
DOLE
$1.37B
| $17K | ﹤0.01% |
1,300
-300
| -19% | -$3.85K |
|
6918
PUT
GrafTech
EAF
$189M
| $17K | ﹤0.01% |
340
-1,620
| -83% | -$75.4K |
|
|
EVRI
6919
PUT
DELISTED
Everi Holdings
EVRI
| $17K | ﹤0.01% |
1,200
-3,400
| -74% | -$51.7K |
|
6920
Expensify
EXFY
$176M
| $17K | ﹤0.01% |
2,172
-9,699
| -82% | -$71.2K |
|
6921
CALL
Federated Hermes
FHI
$4.6B
| $17K | ﹤0.01% |
500
-1,800
| -78% | -$69.6K |
|
6922
PUT
Gold Royalty Corp
GROY
$607M
| $17K | ﹤0.01% |
9,700
-7,100
| -42% | -$14.7K |
|
6923
PUT
HF Foods Group
HFFG
$80.7M
| $17K | ﹤0.01% |
3,700
| – | – |
|
6924
CALL
ICU Medical
ICUI
$4.17B
| $17K | ﹤0.01% |
100
-500
| -83% | -$91.7K |
|
6925
CALL
LKQ Corp
LKQ
$6.7B
| $17K | ﹤0.01% |
300
-14,200
| -98% | -$790K |
|
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.