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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4176
PUT
Kamada
KMDA
$404M
| $365K | ﹤0.01% |
65,200
+25,800
| +65% | +$153K |
|
4177
PUT
Pacira BioSciences
PCRX
$1.04B
| $365K | ﹤0.01% |
12,500
+10,000
| +400% | +$307K |
|
4178
PUT
CorMedix
CRMD
$564M
| $364K | ﹤0.01% |
86,000
+15,700
| +22% | +$54.4K |
|
4179
PUT
BlackBerry
BB
$4.58B
| $363K | ﹤0.01% |
131,800
+55,600
| +73% | +$162K |
|
|
AGNT
4180
AGNT Inc
AGNT
$629M
| $363K | ﹤0.01% |
+35,175
| New | +$431K |
|
4181
Genius Sports
GENI
$1.95B
| $363K | ﹤0.01% |
63,612
+2,524
| +4% | +$16.2K |
|
4182
CALL
QuickLogic
QUIK
$211M
| $363K | ﹤0.01% |
22,700
+16,700
| +278% | +$240K |
|
4183
California Resources
CRC
$4.49B
| $362K | ﹤0.01% |
+6,575
| New | +$343K |
|
4184
CALL
Gibraltar Industries
ROCK
$1.28B
| $362K | ﹤0.01% |
4,500
| – | – |
|
4185
PUT
Aemetis
AMTX
$99.2M
| $361K | ﹤0.01% |
60,300
+13,600
| +29% | +$51.6K |
|
4186
REX American Resources
REX
$1.39B
| $361K | ﹤0.01% |
12,298
-5,328
| -30% | -$117K |
|
4187
Recursion Pharmaceuticals
RXRX
$1.58B
| $361K | ﹤0.01% |
+36,216
| New | +$403K |
|
4188
PUT
Banco Santander
SAN
$191B
| $360K | ﹤0.01% |
74,500
+55,600
| +294% | +$232K |
|
4189
CALL
Annexon
ANNX
$796M
| $359K | ﹤0.01% |
+50,100
| New | +$260K |
|
4190
PUT
Arvinas
ARVN
$530M
| $359K | ﹤0.01% |
8,700
-43,400
| -83% | -$1.9M |
|
4191
CALL
Mercury Systems
MRCY
$5.41B
| $359K | ﹤0.01% |
12,200
+12,100
| +12,100% | +$365K |
|
|
MTTR
4192
DELISTED
Matterport, Inc. Class A Common Stock
MTTR
| $359K | ﹤0.01% |
159,289
+5,956
| +4% | +$13.1K |
|
|
OLK
4193
CALL
DELISTED
Olink Holding AB (publ) American Depositary Shares
OLK
| $359K | ﹤0.01% |
15,300
+10,500
| +219% | +$253K |
|
4194
CALL
Fortuna Silver Mines
FSM
$2.54B
| $358K | ﹤0.01% |
96,100
-128,100
| -57% | -$410K |
|
4195
CALL
Highwoods Properties
HIW
$3.79B
| $358K | ﹤0.01% |
13,700
+4,000
| +41% | +$94.7K |
|
4196
NetEase
NTES
$83B
| $358K | ﹤0.01% |
3,469
-50,884
| -94% | -$5.2M |
|
4197
PUT
Arhaus
ARHS
$1.07B
| $357K | ﹤0.01% |
23,200
-16,200
| -41% | -$209K |
|
|
PPLI
4198
People Inc
PPLI
$3.12B
| $357K | ﹤0.01% |
8,179
+860
| +12% | +$37.1K |
|
4199
CALL
Centrus Energy
LEU
$3.14B
| $357K | ﹤0.01% |
8,600
-9,500
| -52% | -$436K |
|
|
ESPR
4200
PUT
DELISTED
Esperion Therapeutics
ESPR
| $356K | ﹤0.01% |
133,100
+43,500
| +49% | +$106K |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.