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 | |
|---|---|---|---|---|---|---|
1651
PUT
SentinelOne
S
$6.22B
| $3M | ﹤0.01% |
198,800
+141,700
| +248% | +$2.4M |
|
1652
PUT
Martin Marietta Materials
MLM
$33.6B
| $3M | ﹤0.01% |
6,500
+5,200
| +400% | +$2.05M |
|
1653
CALL
IQVIA
IQV
$34.7B
| $2.99M | ﹤0.01% |
13,300
+12,700
| +2,117% | +$2.55M |
|
|
JKS
1654
PUT
JinkoSolar
JKS
$775M
| $2.99M | ﹤0.01% |
67,300
+20,400
| +43% | +$923K |
|
1655
PUT
Metropolitan Bank Holding Corp
MCB
$1.13B
| $2.98M | ﹤0.01% |
85,900
-110,600
| -56% | -$3.33M |
|
1656
CALL
Harley-Davidson
HOG
$2.68B
| $2.98M | ﹤0.01% |
84,600
-97,600
| -54% | -$3.41M |
|
|
CFLT
1657
PUT
DELISTED
Confluent
CFLT
| $2.98M | ﹤0.01% |
84,300
-52,300
| -38% | -$1.46M |
|
1658
Arista Networks
ANET
$219B
| $2.97M | ﹤0.01% |
73,384
+51,996
| +243% | +$2.01M |
|
1659
Cheniere Energy
LNG
$56.5B
| $2.97M | ﹤0.01% |
+19,507
| New | +$2.89M |
|
1660
CALL
Bausch Health
BHC
$1.65B
| $2.97M | ﹤0.01% |
371,200
+122,400
| +49% | +$902K |
|
1661
PUT
Itaú Unibanco
ITUB
$91.3B
| $2.97M | ﹤0.01% |
570,126
-125,989
| -18% | -$595K |
|
1662
CALL
Exelixis
EXEL
$13.9B
| $2.96M | ﹤0.01% |
155,200
+64,300
| +71% | +$1.24M |
|
1663
CALL
Murphy Oil
MUR
$5.58B
| $2.96M | ﹤0.01% |
77,400
+11,700
| +18% | +$432K |
|
1664
PUT
Arcus Biosciences
RCUS
$3.57B
| $2.96M | ﹤0.01% |
145,600
+126,500
| +662% | +$2.41M |
|
1665
PUT
Elastic
ESTC
$6.1B
| $2.96M | ﹤0.01% |
46,100
+5,100
| +12% | +$320K |
|
1666
CALL
Hecla Mining
HL
$10.2B
| $2.95M | ﹤0.01% |
573,600
+350,100
| +157% | +$2M |
|
1667
ProShares Ultra S&P500
SSO
$7.82B
| $2.95M | ﹤0.01% |
101,632
+71,250
| +235% | +$1.86M |
|
1668
Vanguard Value ETF
VTV
$189B
| $2.94M | ﹤0.01% |
20,728
+12,336
| +147% | +$1.71M |
|
1669
PUT
ChargePoint
CHPT
$133M
| $2.94M | ﹤0.01% |
16,750
-2,410
| -13% | -$422K |
|
1670
CALL
Saia
SAIA
$11.3B
| $2.94M | ﹤0.01% |
8,600
+7,300
| +562% | +$2.11M |
|
1671
PUT
Wendy's
WEN
$1.33B
| $2.94M | ﹤0.01% |
135,400
+37,800
| +39% | +$842K |
|
1672
PUT
Nu Holdings
NU
$68.1B
| $2.94M | ﹤0.01% |
372,600
-79,000
| -17% | -$485K |
|
1673
PUT
FTAI Aviation
FTAI
$22.2B
| $2.93M | ﹤0.01% |
92,600
+17,000
| +22% | +$482K |
|
1674
Intuit
INTU
$81.1B
| $2.93M | ﹤0.01% |
6,396
-52,449
| -89% | -$23M |
|
1675
CALL
STMicroelectronics
STM
$46B
| $2.93M | ﹤0.01% |
58,600
-51,800
| -47% | -$2.4M |
|
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.