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 |
Walmart Inc
WMT
|
+$43.6M |
| 2 |
Apple
AAPL
|
+$40.9M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$37.7M |
| 4 |
Citigroup
C
|
+$34.2M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$32.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$189M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 3 |
NVIDIA
NVDA
|
+$115M |
| 4 |
Tesla
TSLA
|
+$52M |
| 5 |
Meta Platforms (Facebook)
META
|
+$49M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.42% |
| 2 | Consumer Discretionary | 0.2% |
| 3 | Healthcare | 0.17% |
| 4 | Industrials | 0.15% |
| 5 | Communication Services | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1251
Vodafone
VOD
$35.1B
| $5.39M | ﹤0.01% |
488,210
+170,697
| +54% | +$1.94M |
|
|
K
1252
CALL
DELISTED
Kellanova
K
| $5.38M | ﹤0.01% |
85,520
+4,793
| +6% | +$303K |
|
1253
PUT
Super Micro Computer
SMCI
$20.2B
| $5.37M | ﹤0.01% |
504,000
-470,000
| -48% | -$4.24M |
|
1254
CALL
TransUnion
TRU
$14.2B
| $5.37M | ﹤0.01% |
86,400
+65,000
| +304% | +$4.25M |
|
1255
CALL
Consolidated Edison
ED
$41.6B
| $5.35M | ﹤0.01% |
55,900
+17,900
| +47% | +$1.68M |
|
1256
PUT
Dell
DELL
$284B
| $5.34M | ﹤0.01% |
132,900
-105,000
| -44% | -$4.23M |
|
1257
PUT
Fair Isaac
FICO
$28B
| $5.34M | ﹤0.01% |
7,600
+1,300
| +21% | +$865K |
|
1258
CALL
Corpay
CPAY
$23.8B
| $5.33M | ﹤0.01% |
25,300
-11,000
| -30% | -$2.23M |
|
1259
CALL
Rambus
RMBS
$11.2B
| $5.33M | ﹤0.01% |
104,000
+90,100
| +648% | +$3.87M |
|
1260
PUT
Aon
AON
$76B
| $5.33M | ﹤0.01% |
16,900
-1,900
| -10% | -$588K |
|
1261
American Airlines Group
AAL
$8.97B
| $5.32M | ﹤0.01% |
+360,912
| New | +$5.63M |
|
1262
Vistra
VST
$57B
| $5.32M | ﹤0.01% |
221,830
+180,014
| +430% | +$4.17M |
|
1263
CALL
Southern Copper
SCCO
$143B
| $5.3M | ﹤0.01% |
74,971
-195,354
| -72% | -$13.3M |
|
1264
Chewy
CHWY
$8.38B
| $5.29M | ﹤0.01% |
141,501
+139,144
| +5,903% | +$5.76M |
|
1265
CALL
Parker-Hannifin
PH
$124B
| $5.28M | ﹤0.01% |
15,700
-9,900
| -39% | -$3.28M |
|
1266
CALL
Five Below
FIVE
$11.1B
| $5.27M | ﹤0.01% |
25,600
-61,300
| -71% | -$12.1M |
|
|
SGI
1267
PUT
Somnigroup International
SGI
$14.5B
| $5.27M | ﹤0.01% |
133,500
-91,600
| -41% | -$3.64M |
|
1268
PUT
NovoCure
NVCR
$2.32B
| $5.27M | ﹤0.01% |
87,600
+25,600
| +41% | +$2.05M |
|
1269
ASML
ASML
$693B
| $5.26M | ﹤0.01% |
+7,734
| New | +$4.97M |
|
1270
PUT
iQIYI
IQ
$1.17B
| $5.26M | ﹤0.01% |
723,100
-215,400
| -23% | -$1.48M |
|
1271
CALL
Lattice Semiconductor
LSCC
$18.9B
| $5.26M | ﹤0.01% |
55,100
+53,000
| +2,524% | +$4.36M |
|
1272
CALL
TransDigm Group
TDG
$67.9B
| $5.23M | ﹤0.01% |
7,100
+3,000
| +73% | +$2.14M |
|
1273
CALL
KB Home
KBH
$3.41B
| $5.23M | ﹤0.01% |
130,200
+54,700
| +72% | +$2M |
|
1274
PUT
Logitech
LOGI
$14.8B
| $5.23M | ﹤0.01% |
90,100
-25,300
| -22% | -$1.44M |
|
1275
PUT
Jabil
JBL
$33.7B
| $5.22M | ﹤0.01% |
59,200
-25,300
| -30% | -$2.04M |
|
Similar funds
Simplex Trading's Q1 2023 Portfolio in Review
As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.
By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.
- Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
- Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
- Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
- Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
- Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
- Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
- Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.
Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.