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 | |
|---|---|---|---|---|---|---|
4226
CALL
Geron
GERN
$930M
| $216K | ﹤0.01% |
99,600
-598,800
| -86% | -$1.7M |
|
4227
CALL
Fusion Fuel Green
HTOO
$8.85M
| $216K | ﹤0.01% |
2,580
+1,974
| +326% | +$247K |
|
4228
CALL
MidCap Financial Investment
MFIC
$811M
| $216K | ﹤0.01% |
19,000
+14,900
| +363% | +$179K |
|
4229
CALL
Ouster
OUST
$2.28B
| $216K | ﹤0.01% |
25,870
+13,700
| +113% | +$159K |
|
4230
Perrigo
PRGO
$1.43B
| $216K | ﹤0.01% |
6,034
-8,630
| -59% | -$312K |
|
4231
CALL
Zai Lab
ZLAB
$2.1B
| $216K | ﹤0.01% |
6,500
-600
| -8% | -$23K |
|
|
ENZ
4232
DELISTED
Enzo Biochem, Inc.
ENZ
| $216K | ﹤0.01% |
88,897
+17,026
| +24% | +$25.3K |
|
4233
Actinium Pharmaceuticals
ATNM
$27.2M
| $215K | ﹤0.01% |
22,756
+17,058
| +299% | +$180K |
|
4234
Cipher Digital
CIFR
$8.35B
| $215K | ﹤0.01% |
92,471
+82,806
| +857% | +$127K |
|
4235
PUT
Commercial Metals
CMC
$7.8B
| $215K | ﹤0.01% |
4,400
-400
| -8% | -$20.7K |
|
4236
Thomson Reuters
TRI
$45.1B
| $215K | ﹤0.01% |
+1,573
| New | +$201K |
|
4237
CALL
Beam Global
BEEM
$23.1M
| $214K | ﹤0.01% |
13,500
+5,000
| +59% | +$82.6K |
|
4238
Broadwind
BWEN
$92.9M
| $214K | ﹤0.01% |
+55,762
| New | +$237K |
|
4239
CALL
TORM
TRMD
$3.05B
| $214K | ﹤0.01% |
6,900
+2,100
| +44% | +$63.9K |
|
|
WSR
4240
CALL
DELISTED
Whitestone REIT
WSR
| $214K | ﹤0.01% |
23,300
+10,000
| +75% | +$96.8K |
|
4241
CALL
Amkor Technology
AMKR
$11.3B
| $213K | ﹤0.01% |
8,200
-51,100
| -86% | -$1.4M |
|
|
GTLS
4242
CALL
DELISTED
Chart Industries
GTLS
| $213K | ﹤0.01% |
1,700
-7,500
| -82% | -$965K |
|
4243
CALL
VEON
VEON
$3.57B
| $213K | ﹤0.01% |
+12,100
| New | +$194K |
|
4244
CALL
Arrow Electronics
ARW
$10.8B
| $212K | ﹤0.01% |
1,700
+800
| +89% | +$94.9K |
|
4245
CALL
Cincinnati Financial
CINF
$28B
| $212K | ﹤0.01% |
1,900
-31,900
| -94% | -$3.63M |
|
4246
Franklin Wireless
FKWL
$27.2M
| $212K | ﹤0.01% |
42,607
+29,573
| +227% | +$147K |
|
4247
Centrus Energy
LEU
$3.34B
| $212K | ﹤0.01% |
+6,591
| New | +$253K |
|
4248
CALL
Photronics
PLAB
$1.72B
| $212K | ﹤0.01% |
12,800
-3,100
| -19% | -$54.5K |
|
4249
SCYNEXIS
SCYX
$36M
| $212K | ﹤0.01% |
+8,858
| New | +$118K |
|
4250
PUT
Sixth Street Specialty
TSLX
$1.68B
| $212K | ﹤0.01% |
11,600
+4,200
| +57% | +$77.9K |
|
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.