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 | |
|---|---|---|---|---|---|---|
|
PACW
1126
PUT
DELISTED
PacWest Bancorp
PACW
| $6.69M | 0.01% |
820,500
+434,000
| +112% | +$3.5M |
|
1127
CALL
Labcorp
LH
$23.9B
| $6.68M | 0.01% |
32,243
-6,984
| -18% | -$1.35M |
|
1128
CALL
Idexx Laboratories
IDXX
$42.5B
| $6.68M | 0.01% |
13,300
-14,900
| -53% | -$7.14M |
|
1129
PUT
SiriusXM
SIRI
$10.1B
| $6.68M | 0.01% |
147,440
+114,480
| +347% | +$4.32M |
|
1130
CALL
Qorvo
QRVO
$7.65B
| $6.67M | 0.01% |
65,400
+15,100
| +30% | +$1.45M |
|
1131
British American Tobacco
BTI
$129B
| $6.67M | 0.01% |
200,780
+55,282
| +38% | +$1.89M |
|
1132
PUT
Deutsche Bank
DB
$65.3B
| $6.66M | 0.01% |
632,400
-151,700
| -19% | -$1.6M |
|
1133
PUT
Monolithic Power Systems
MPWR
$68.6B
| $6.64M | 0.01% |
12,300
+700
| +6% | +$333K |
|
1134
PUT
Peabody Energy
BTU
$2.9B
| $6.63M | 0.01% |
306,300
-482,200
| -61% | -$10.7M |
|
|
BBBY
1135
Bed Bath & Beyond
BBBY
$471M
| $6.61M | 0.01% |
223,148
+223,115
| +676,106% | +$4.12M |
|
1136
CALL
Ferguson
FERG
$44.3B
| $6.61M | 0.01% |
42,000
+25,900
| +161% | +$3.69M |
|
1137
NIO
NIO
$11.6B
| $6.59M | 0.01% |
679,735
+74,753
| +12% | +$633K |
|
1138
CALL
Toast
TOST
$16.5B
| $6.57M | 0.01% |
291,300
+170,300
| +141% | +$3.4M |
|
1139
CALL
Floor & Decor
FND
$5.73B
| $6.5M | 0.01% |
62,500
-34,900
| -36% | -$3.34M |
|
1140
CALL
Nextpower Inc
NXT
$15.8B
| $6.49M | 0.01% |
163,000
+99,800
| +158% | +$3.66M |
|
1141
PUT
Cardinal Health
CAH
$52.9B
| $6.49M | 0.01% |
68,600
+10,300
| +18% | +$870K |
|
1142
CALL
CF Industries
CF
$19.5B
| $6.48M | 0.01% |
93,400
-110,300
| -54% | -$7.69M |
|
1143
CALL
GitLab
GTLB
$5.1B
| $6.46M | 0.01% |
126,500
+34,200
| +37% | +$1.27M |
|
|
PACW
1144
CALL
DELISTED
PacWest Bancorp
PACW
| $6.46M | 0.01% |
793,300
-80,300
| -9% | -$647K |
|
1145
Caterpillar
CAT
$412B
| $6.46M | 0.01% |
+26,254
| New | +$5.85M |
|
|
ANSS
1146
CALL
DELISTED
Ansys
ANSS
| $6.44M | 0.01% |
19,500
+10,000
| +105% | +$3.17M |
|
|
HCP
1147
PUT
DELISTED
HashiCorp, Inc. Class A Common Stock
HCP
| $6.39M | 0.01% |
244,200
+29,800
| +14% | +$873K |
|
|
BRSL
1148
CALL
Brightstar Lottery PLC
BRSL
$1.9B
| $6.37M | 0.01% |
199,900
+158,300
| +381% | +$4.4M |
|
1149
PUT
Realty Income
O
$60.4B
| $6.36M | 0.01% |
106,400
-21,700
| -17% | -$1.32M |
|
1150
ExxonMobil
XOM
$650B
| $6.36M | 0.01% |
+59,295
| New | +$6.47M |
|
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.