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 | |
|---|---|---|---|---|---|---|
5576
CALL
Voya Financial
VOYA
$9.01B
| $64K | ﹤0.01% |
900
-28,900
| -97% | -$2.07M |
|
5577
Zevra Therapeutics
ZVRA
$562M
| $64K | ﹤0.01% |
+12,694
| New | +$68.4K |
|
|
SEI
5578
PUT
Solaris Energy Infrastructure
SEI
$3.15B
| $64K | ﹤0.01% |
7,800
+400
| +5% | +$3.21K |
|
|
PETQ
5579
DELISTED
PetIQ, Inc. Class A Common Stock
PETQ
| $64K | ﹤0.01% |
+4,269
| New | +$54.8K |
|
|
TCN
5580
DELISTED
Tricon Residential Inc.
TCN
| $64K | ﹤0.01% |
7,325
-71,846
| -91% | -$587K |
|
5581
Aaon
AAON
$7.3B
| $63K | ﹤0.01% |
1,001
-2,718
| -73% | -$172K |
|
5582
Barnes & Noble Education
BNED
$431M
| $63K | ﹤0.01% |
505
+324
| +179% | +$45.3K |
|
5583
CALL
Byrna Technologies
BYRN
$103M
| $63K | ﹤0.01% |
12,700
-30,400
| -71% | -$164K |
|
|
BZUN
5584
PUT
Baozun
BZUN
$167M
| $63K | ﹤0.01% |
15,900
-6,000
| -27% | -$26.8K |
|
5585
PUT
Cabaletta Bio
CABA
$437M
| $63K | ﹤0.01% |
4,900
+2,300
| +88% | +$25K |
|
5586
CALL
Harmony Biosciences
HRMY
$2.04B
| $63K | ﹤0.01% |
1,800
-8,700
| -83% | -$300K |
|
5587
PUT
Lightbridge
LTBR
$271M
| $63K | ﹤0.01% |
10,900
+300
| +3% | +$1.33K |
|
5588
PUT
La-Z-Boy
LZB
$1.58B
| $63K | ﹤0.01% |
2,200
-3,000
| -58% | -$83.8K |
|
5589
PUT
Moelis & Co
MC
$4.97B
| $63K | ﹤0.01% |
1,400
-4,300
| -75% | -$172K |
|
|
OPRA
5590
CALL
Opera Ltd
OPRA
$1.69B
| $63K | ﹤0.01% |
3,200
+1,400
| +78% | +$20K |
|
|
ORGN
5591
PUT
DELISTED
Origin Materials
ORGN
| $63K | ﹤0.01% |
497
-290
| -37% | -$37.3K |
|
5592
Precigen
PGEN
$2.24B
| $63K | ﹤0.01% |
54,898
-28,622
| -34% | -$33.8K |
|
5593
CALL
Radiant Logistics
RLGT
$386M
| $63K | ﹤0.01% |
9,400
+3,700
| +65% | +$23.9K |
|
5594
Summit Therapeutics
SMMT
$10.4B
| $63K | ﹤0.01% |
25,114
+12,678
| +102% | +$23.1K |
|
|
SOND
5595
PUT
DELISTED
Sonder
SOND
| $63K | ﹤0.01% |
5,970
-13,250
| -69% | -$144K |
|
|
BBT
5596
CALL
Beacon Financial Corp
BBT
$2.66B
| $62K | ﹤0.01% |
+3,000
| New | +$64.8K |
|
5597
Direxion Daily CSI 300 China A Share Bull 2X ETF
CHAU
$89.3M
| $62K | ﹤0.01% |
3,538
+1,150
| +48% | +$23K |
|
5598
CALL
GoodRx Holdings
GDRX
$1.04B
| $62K | ﹤0.01% |
11,400
-26,700
| -70% | -$144K |
|
5599
CALL
Horizon Bancorp
HBNC
$1.04B
| $62K | ﹤0.01% |
+6,000
| New | +$59.6K |
|
5600
CALL
ICF International
ICFI
$1.46B
| $62K | ﹤0.01% |
+500
| New | +$57.7K |
|
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.