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 | |
|---|---|---|---|---|---|---|
2751
CALL
Bentley Systems
BSY
$10B
| $851K | ﹤0.01% |
15,700
+13,600
| +648% | +$635K |
|
2752
PUT
OneSpan
OSPN
$572M
| $851K | ﹤0.01% |
57,400
+30,600
| +114% | +$477K |
|
2753
PUT
Radware
RDWR
$1.24B
| $851K | ﹤0.01% |
43,900
+28,600
| +187% | +$572K |
|
2754
Axcelis
ACLS
$3.91B
| $850K | ﹤0.01% |
+4,638
| New | +$668K |
|
2755
SSR Mining
SSRM
$5.45B
| $850K | ﹤0.01% |
59,980
-5,029
| -8% | -$76.1K |
|
|
PRFT
2756
DELISTED
Perficient Inc
PRFT
| $850K | ﹤0.01% |
10,203
+6,676
| +189% | +$492K |
|
2757
Markel Group
MKL
$25.1B
| $849K | ﹤0.01% |
614
-629
| -51% | -$843K |
|
2758
CALL
Intellia Therapeutics
NTLA
$1.54B
| $848K | ﹤0.01% |
20,800
+4,100
| +25% | +$166K |
|
2759
PUT
Paylocity
PCTY
$6.99B
| $848K | ﹤0.01% |
4,600
-16,900
| -79% | -$3.09M |
|
2760
CALL
Ecopetrol
EC
$32.5B
| $847K | ﹤0.01% |
82,700
+50,100
| +154% | +$505K |
|
2761
ProShares UltraPro Dow 30
UDOW
$837M
| $847K | ﹤0.01% |
+28,406
| New | +$806K |
|
2762
PUT
Boot Barn
BOOT
$4.71B
| $846K | ﹤0.01% |
10,000
+8,800
| +733% | +$645K |
|
2763
CALL
Energy Vault
NRGV
$513M
| $846K | ﹤0.01% |
310,100
+1,800
| +0.6% | +$3.79K |
|
2764
Timken Company
TKR
$9.72B
| $846K | ﹤0.01% |
+9,243
| New | +$729K |
|
2765
Edison International
EIX
$30.5B
| $842K | ﹤0.01% |
12,126
+11,964
| +7,385% | +$842K |
|
2766
CALL
WillScot Mobile Mini Holdings
WSC
$4.89B
| $841K | ﹤0.01% |
17,600
-202,800
| -92% | -$9.07M |
|
2767
PUT
dLocal
DLO
$4.37B
| $839K | ﹤0.01% |
68,800
+32,600
| +90% | +$431K |
|
2768
CALL
Insmed
INSM
$23.2B
| $839K | ﹤0.01% |
39,800
+1,800
| +5% | +$34.2K |
|
2769
PUT
PTC
PTC
$14.1B
| $839K | ﹤0.01% |
5,900
-26,900
| -82% | -$3.56M |
|
2770
CALL
AeroVironment
AVAV
$7.71B
| $838K | ﹤0.01% |
8,200
+1,100
| +15% | +$111K |
|
2771
CALL
CNX Resources
CNX
$4.81B
| $838K | ﹤0.01% |
47,300
+4,500
| +11% | +$72.6K |
|
2772
CALL
Deutsche Bank
DB
$68B
| $838K | ﹤0.01% |
79,600
-91,100
| -53% | -$960K |
|
|
CANO
2773
CALL
DELISTED
Cano Health, Inc.
CANO
| $838K | ﹤0.01% |
6,034
+1,687
| +39% | +$216K |
|
2774
CALL
MarketAxess Holdings
MKTX
$4.18B
| $836K | ﹤0.01% |
3,200
+800
| +33% | +$239K |
|
2775
CALL
Evergy
EVRG
$20B
| $835K | ﹤0.01% |
14,300
-5,100
| -26% | -$308K |
|
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.