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 | |
|---|---|---|---|---|---|---|
4601
PUT
Aspen Aerogels
ASPN
$339M
| $153K | ﹤0.01% |
19,500
-43,000
| -69% | -$299K |
|
4602
CALL
Cohu
COHU
$1.86B
| $153K | ﹤0.01% |
3,700
-1,200
| -24% | -$44.3K |
|
4603
Cerence
CRNC
$359M
| $153K | ﹤0.01% |
5,250
-2,153
| -29% | -$59K |
|
4604
Sundial Growers
SNDL
$312M
| $153K | ﹤0.01% |
111,988
+22,904
| +26% | +$34.8K |
|
|
VNET
4605
PUT
VNET Group
VNET
$1.79B
| $153K | ﹤0.01% |
53,100
-48,000
| -47% | -$146K |
|
|
ABK
4606
PUT
DELISTED
Ambac Financial Group
ABK
| $153K | ﹤0.01% |
10,800
-4,100
| -28% | -$58.1K |
|
|
CVAC
4607
CALL
DELISTED
CureVac
CVAC
| $152K | ﹤0.01% |
14,600
-42,200
| -74% | -$377K |
|
|
ITOS
4608
DELISTED
iTeos Therapeutics
ITOS
| $152K | ﹤0.01% |
11,503
+9,463
| +464% | +$135K |
|
4609
CALL
Myriad Genetics
MYGN
$476M
| $152K | ﹤0.01% |
6,600
+3,600
| +120% | +$78.6K |
|
4610
PUT
MYR Group
MYRG
$5.01B
| $152K | ﹤0.01% |
+1,100
| New | +$144K |
|
4611
CALL
West Pharmaceutical
WST
$23.7B
| $152K | ﹤0.01% |
400
-18,400
| -98% | -$6.57M |
|
4612
CALL
ADT
ADT
$5.43B
| $151K | ﹤0.01% |
25,200
+22,900
| +996% | +$143K |
|
4613
Madison Square Garden
MSGE
$3.59B
| $151K | ﹤0.01% |
+4,494
| New | +$154K |
|
4614
CALL
Oaktree Specialty Lending
OCSL
$1.05B
| $151K | ﹤0.01% |
7,800
-1,500
| -16% | -$28.2K |
|
4615
Sportradar
SRAD
$4.42B
| $151K | ﹤0.01% |
11,719
+9,239
| +373% | +$111K |
|
|
PETQ
4616
PUT
DELISTED
PetIQ, Inc. Class A Common Stock
PETQ
| $151K | ﹤0.01% |
10,000
-4,700
| -32% | -$60.3K |
|
|
SP
4617
DELISTED
SP Plus Corporation
SP
| $151K | ﹤0.01% |
3,878
-638
| -14% | -$23K |
|
|
ARCE
4618
PUT
DELISTED
Arco Platform Limited Class A Common Shares
ARCE
| $151K | ﹤0.01% |
+12,500
| New | +$148K |
|
4619
PUT
Beam Therapeutics
BEAM
$2.68B
| $150K | ﹤0.01% |
4,700
-51,400
| -92% | -$1.67M |
|
4620
Cellebrite
CLBT
$3.76B
| $150K | ﹤0.01% |
20,960
-9,985
| -32% | -$58.2K |
|
4621
CALL
MasterCraft Boat Holdings
MCFT
$596M
| $150K | ﹤0.01% |
4,900
+3,600
| +277% | +$104K |
|
|
SILV
4622
CALL
DELISTED
SilverCrest Metals Inc. Common Shares
SILV
| $150K | ﹤0.01% |
25,600
+1,500
| +6% | +$9.85K |
|
4623
CALL
Affiliated Managers Group
AMG
$9.51B
| $149K | ﹤0.01% |
1,000
| – | – |
|
4624
PUT
Clene
CLNN
$60.3M
| $149K | ﹤0.01% |
8,480
+1,200
| +16% | +$23.4K |
|
4625
CALL
Fidelity Corporate Bond ETF
FCOR
$353M
| $149K | ﹤0.01% |
3,300
+500
| +18% | +$22.9K |
|
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.