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 | |
|---|---|---|---|---|---|---|
5051
PUT
Photronics
PLAB
$1.65B
| $103K | ﹤0.01% |
4,000
-4,100
| -51% | -$76K |
|
|
PLYA
5052
DELISTED
Playa Hotels & Resorts
PLYA
| $103K | ﹤0.01% |
12,724
-2,562
| -17% | -$23.2K |
|
5053
PUT
Taboola.com
TBLA
$1.41B
| $103K | ﹤0.01% |
33,400
+2,400
| +8% | +$6.58K |
|
5054
John Wiley & Sons Class A
WLY
$2.83B
| $103K | ﹤0.01% |
3,027
+2,997
| +9,990% | +$109K |
|
|
AFCG
5055
CALL
AFC Gamma
AFCG
$60.9M
| $102K | ﹤0.01% |
11,980
-3,214
| -21% | -$26.1K |
|
|
BRT
5056
CALL
BRT Apartments
BRT
$284M
| $102K | ﹤0.01% |
5,200
+1,600
| +44% | +$29.7K |
|
5057
PUT
Invesco DB Commodity Index Tracking Fund
DBC
$1.69B
| $102K | ﹤0.01% |
4,500
-100
| -2% | -$2.32K |
|
5058
Invesco KBW Bank ETF
KBWB
$6.72B
| $102K | ﹤0.01% |
2,504
-7,234
| -74% | -$295K |
|
5059
PUT
Patterson-UTI
PTEN
$3.54B
| $102K | ﹤0.01% |
8,600
-1,200
| -12% | -$13.5K |
|
|
ABCM
5060
CALL
DELISTED
Abcam PLC
ABCM
| $102K | ﹤0.01% |
4,200
+2,300
| +121% | +$39.7K |
|
|
TGR
5061
PUT
DELISTED
ISHARES TARGET DATE RETIREMENT INCOME ETF
TGR
| $102K | ﹤0.01% |
4,700
-96,700
| -95% | -$2.1M |
|
|
TIO
5062
CALL
DELISTED
Tingo Group, Inc. Common Stock
TIO
| $102K | ﹤0.01% |
+85,000
| New | +$192K |
|
5063
CALL
Absci
ABSI
$1.17B
| $101K | ﹤0.01% |
66,800
| – | – |
|
5064
CALL
AquaBounty Technologies
AQB
$4.73M
| $101K | ﹤0.01% |
14,335
-45
| -0.3% | -$435 |
|
5065
Collegium Pharmaceutical
COLL
$1.18B
| $101K | ﹤0.01% |
4,739
-12,744
| -73% | -$289K |
|
5066
PUT
Interface
TILE
$1.95B
| $101K | ﹤0.01% |
11,600
| – | – |
|
5067
PUT
XPEL
XPEL
$1.22B
| $101K | ﹤0.01% |
1,200
+900
| +300% | +$66.5K |
|
|
ACRE
5068
PUT
Ares Commercial Real Estate
ACRE
$247M
| $100K | ﹤0.01% |
9,900
+2,200
| +29% | +$20.1K |
|
5069
CALL
Avnet
AVT
$6.86B
| $100K | ﹤0.01% |
2,000
-4,500
| -69% | -$198K |
|
5070
AXT Inc
AXTI
$2.42B
| $100K | ﹤0.01% |
+29,277
| New | +$98.7K |
|
|
SRTA
5071
CALL
Strata Critical Medical Inc
SRTA
$421M
| $100K | ﹤0.01% |
25,600
+11,400
| +80% | +$36.2K |
|
5072
Cadre Holdings
CDRE
$1.31B
| $100K | ﹤0.01% |
+4,600
| New | +$97.9K |
|
5073
Federal Signal
FSS
$6.82B
| $100K | ﹤0.01% |
+1,574
| New | +$87K |
|
|
HOUS
5074
DELISTED
Anywhere Real Estate
HOUS
| $100K | ﹤0.01% |
15,113
+2,809
| +23% | +$16.8K |
|
5075
PUT
Icon
ICLR
$13.7B
| $100K | ﹤0.01% |
400
| – | – |
|
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.