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 | |
|---|---|---|---|---|---|---|
6051
Leslie's
LESL
$8.12M
| $40K | ﹤0.01% |
215
-144
| -40% | -$29.7K |
|
|
OLPX
6052
CALL
DELISTED
Olaplex Holdings
OLPX
| $40K | ﹤0.01% |
11,000
-24,900
| -69% | -$91.3K |
|
|
OPI
6053
PUT
DELISTED
Office Properties Income Trust
OPI
| $40K | ﹤0.01% |
5,300
-3,400
| -39% | -$25.7K |
|
6054
CALL
Protalix BioTherapeutics
PLX
$183M
| $40K | ﹤0.01% |
20,400
-449,100
| -96% | -$1.07M |
|
6055
PUT
Q2 Holdings
QTWO
$3.68B
| $40K | ﹤0.01% |
1,300
+900
| +225% | +$23.6K |
|
6056
United Bankshares
UBSI
$6.62B
| $40K | ﹤0.01% |
1,359
-1,026
| -43% | -$32.3K |
|
6057
US Gold Corp
USAU
$223M
| $40K | ﹤0.01% |
8,991
+5,528
| +160% | +$24.3K |
|
6058
PUT
Veracyte
VCYT
$4.77B
| $40K | ﹤0.01% |
1,600
+1,100
| +220% | +$26.7K |
|
|
AUTL
6059
CALL
Autolus Therapeutics
AUTL
$407M
| $39K | ﹤0.01% |
16,600
+13,900
| +515% | +$33K |
|
6060
Invesco China Technology ETF
CQQQ
$2.99B
| $39K | ﹤0.01% |
1,004
+630
| +168% | +$26.3K |
|
6061
Customers Bancorp
CUBI
$2.65B
| $39K | ﹤0.01% |
1,312
-5,841
| -82% | -$131K |
|
6062
PUT
CryoPort
CYRX
$773M
| $39K | ﹤0.01% |
2,300
-21,800
| -90% | -$446K |
|
6063
PUT
Digi International
DGII
$2.57B
| $39K | ﹤0.01% |
+1,000
| New | +$34.4K |
|
6064
PUT
Domo
DOMO
$174M
| $39K | ﹤0.01% |
2,700
+1,600
| +145% | +$23.6K |
|
6065
PUT
Kennametal
KMT
$2.54B
| $39K | ﹤0.01% |
1,400
+1,000
| +250% | +$26.8K |
|
6066
CALL
Lincoln Electric
LECO
$13.7B
| $39K | ﹤0.01% |
200
| – | – |
|
|
6067
Lincoln Electric
LECO
$13.7B
| $39K | ﹤0.01% |
199
+163
| +453% | +$28.4K |
|
|
6068
PUT
Lincoln Electric
LECO
$13.7B
| $39K | ﹤0.01% |
200
-200
| -50% | -$34.8K |
|
6069
PUT
Pediatrix Medical
MD
$2.17B
| $39K | ﹤0.01% |
2,800
-41,100
| -94% | -$577K |
|
|
NGD
6070
PUT
DELISTED
New Gold Inc
NGD
| $39K | ﹤0.01% |
36,900
+28,700
| +350% | +$35.5K |
|
6071
Pulse Biosciences
PLSE
$2.43B
| $39K | ﹤0.01% |
+5,516
| New | +$35.2K |
|
|
RNAM
6072
PUT
DELISTED
Avidity Biosciences
RNAM
| $39K | ﹤0.01% |
3,600
+100
| +3% | +$1.25K |
|
6073
PUT
Stereotaxis
STXS
$133M
| $39K | ﹤0.01% |
26,100
| – | – |
|
6074
Utz Brands
UTZ
$1.25B
| $39K | ﹤0.01% |
2,429
-1,037
| -30% | -$17.8K |
|
6075
PUT
Universal Corp
UVV
$1.33B
| $39K | ﹤0.01% |
800
+200
| +33% | +$10.5K |
|
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.