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 | |
|---|---|---|---|---|---|---|
4701
Ingevity
NGVT
$2.46B
| $139K | ﹤0.01% |
+2,397
| New | +$144K |
|
4702
OSI Systems
OSIS
$3.53B
| $139K | ﹤0.01% |
1,184
-1,108
| -48% | -$127K |
|
4703
PagerDuty
PD
$830M
| $139K | ﹤0.01% |
+6,207
| New | +$173K |
|
4704
CALL
Quest Resource Holding
QRHC
$27.6M
| $139K | ﹤0.01% |
21,400
+13,800
| +182% | +$78.9K |
|
4705
State Street SPDR Portfolio S&P 500 Value ETF
SPYV
$36.2B
| $139K | ﹤0.01% |
3,225
-24,527
| -88% | -$1.01M |
|
|
VLRS
4706
CALL
Controladora Vuela Compania de Aviacion
VLRS
$869M
| $139K | ﹤0.01% |
10,000
-400
| -4% | -$5.14K |
|
4707
CALL
Assurant
AIZ
$13.9B
| $138K | ﹤0.01% |
+1,100
| New | +$137K |
|
4708
Ethan Allen Interiors
ETD
$600M
| $138K | ﹤0.01% |
+4,886
| New | +$133K |
|
|
FFWM
4709
PUT
DELISTED
First Foundation Inc
FFWM
| $138K | ﹤0.01% |
34,900
+28,700
| +463% | +$148K |
|
4710
St. Joe Company
JOE
$3.55B
| $138K | ﹤0.01% |
2,870
-886
| -24% | -$38.6K |
|
4711
CALL
ProPetro Holding
PUMP
$1.25B
| $138K | ﹤0.01% |
16,800
-200
| -1% | -$1.47K |
|
|
UCTT
4712
PUT
Ultra Clean Holdings
UCTT
$3.12B
| $138K | ﹤0.01% |
3,600
+1,000
| +38% | +$32.2K |
|
4713
CALL
Smartbird Inc
BIRD
$19.5M
| $137K | ﹤0.01% |
5,475
+5,050
| +1,188% | +$126K |
|
4714
CALL
Celestica
CLS
$37.8B
| $137K | ﹤0.01% |
9,500
+7,800
| +459% | +$96.5K |
|
4715
Kayne Anderson Energy Infrastructure Fund
KYN
$2.42B
| $137K | ﹤0.01% |
16,882
-2,025
| -11% | -$16.7K |
|
|
SVM
4716
PUT
Silvercorp Metals
SVM
$2.02B
| $137K | ﹤0.01% |
48,600
-13,000
| -21% | -$44.2K |
|
4717
CALL
Utz Brands
UTZ
$1.24B
| $137K | ﹤0.01% |
8,400
+2,100
| +33% | +$36.1K |
|
|
PYCR
4718
PUT
DELISTED
Paycor HCM, Inc. Common Stock
PYCR
| $137K | ﹤0.01% |
5,800
+5,700
| +5,700% | +$133K |
|
4719
PUT
Altimmune
ALT
$568M
| $136K | ﹤0.01% |
38,600
-168,700
| -81% | -$757K |
|
4720
CALL
Coeur Mining
CDE
$15.1B
| $136K | ﹤0.01% |
48,000
-18,000
| -27% | -$61.2K |
|
|
CMPS
4721
CALL
Compass Pathways
CMPS
$1.47B
| $136K | ﹤0.01% |
16,500
+5,500
| +50% | +$46.7K |
|
|
DHC
4722
Diversified Healthcare Trust
DHC
$2.15B
| $136K | ﹤0.01% |
60,708
+54,282
| +845% | +$77.9K |
|
4723
PUT
Entergy
ETR
$50.3B
| $136K | ﹤0.01% |
2,800
+2,200
| +367% | +$114K |
|
4724
CALL
Navigator Holdings
NVGS
$1.35B
| $136K | ﹤0.01% |
10,500
-2,900
| -22% | -$38.6K |
|
|
SWTX
4725
CALL
DELISTED
SpringWorks Therapeutics
SWTX
| $136K | ﹤0.01% |
5,200
-34,900
| -87% | -$917K |
|
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.