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 |
Apple
AAPL
|
+$552M |
| 2 |
Strategy Inc
MSTR
|
+$85.8M |
| 3 |
MSTX
Defiance Daily Target 2x Long MSTR ETF
MSTX
|
+$48.1M |
| 4 |
Intel
INTC
|
+$45.4M |
| 5 |
Uber
UBER
|
+$43M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$133M |
| 2 |
Pinduoduo
PDD
|
+$82.6M |
| 3 |
Boeing
BA
|
+$49.8M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$45.1M |
| 5 |
Microsoft
MSFT
|
+$41M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.68% |
| 2 | Consumer Discretionary | 0.23% |
| 3 | Healthcare | 0.19% |
| 4 | Financials | 0.13% |
| 5 | Communication Services | 0.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4126
CALL
Viridian Therapeutics
VRDN
$2.15B
| $283K | ﹤0.01% |
14,800
+8,400
| +131% | +$183K |
|
|
ZK
4127
PUT
DELISTED
Zeekr
ZK
| $283K | ﹤0.01% |
10,000
-6,400
| -39% | -$163K |
|
4128
CALL
Beam Therapeutics
BEAM
$2.7B
| $282K | ﹤0.01% |
11,400
-3,400
| -23% | -$86.8K |
|
|
MESO
4129
Mesoblast
MESO
$1.87B
| $282K | ﹤0.01% |
14,249
-5,055
| -26% | -$56K |
|
4130
PUT
Portillo's
PTLO
$339M
| $282K | ﹤0.01% |
30,100
+700
| +2% | +$8.01K |
|
4131
CALL
Rexford Industrial Realty
REXR
$8.64B
| $282K | ﹤0.01% |
7,300
+3,600
| +97% | +$155K |
|
4132
PUT
Trimble
TRMB
$13.6B
| $282K | ﹤0.01% |
4,000
-800
| -17% | -$54.4K |
|
4133
Sprott Uranium Miners ETF
URNM
$1.75B
| $282K | ﹤0.01% |
7,006
-27,967
| -80% | -$1.3M |
|
|
CSGS
4134
PUT
DELISTED
CSG Systems International
CSGS
| $281K | ﹤0.01% |
5,500
+4,000
| +267% | +$206K |
|
4135
CALL
Community Health Systems
CYH
$393M
| $281K | ﹤0.01% |
94,300
+53,000
| +128% | +$223K |
|
4136
EPR Properties
EPR
$4.92B
| $281K | ﹤0.01% |
6,356
+3,746
| +144% | +$172K |
|
4137
CALL
ODDITY Tech
ODD
$784M
| $281K | ﹤0.01% |
6,700
-34,100
| -84% | -$1.47M |
|
4138
PUT
PSQ Holdings
PSQH
$12.4M
| $281K | ﹤0.01% |
4,140
+3,020
| +270% | +$142K |
|
4139
CALL
Robert Half
RHI
$4.04B
| $281K | ﹤0.01% |
4,000
| – | – |
|
|
DESP
4140
DELISTED
Despegar.com
DESP
| $280K | ﹤0.01% |
14,563
+4,247
| +41% | +$66.8K |
|
|
ONT
4141
PUT
Onterris Inc
ONT
$740M
| $280K | ﹤0.01% |
15,100
+14,800
| +4,933% | +$311K |
|
4142
PUT
Olin
OLN
$2.44B
| $280K | ﹤0.01% |
8,300
-200
| -2% | -$8.36K |
|
4143
PUT
Dine Brands
DIN
$458M
| $279K | ﹤0.01% |
9,300
+2,000
| +27% | +$64.3K |
|
|
ODP
4144
CALL
DELISTED
ODP
ODP
| $279K | ﹤0.01% |
12,300
+10,900
| +779% | +$303K |
|
4145
CALL
Olema Pharmaceuticals
OLMA
$1.01B
| $279K | ﹤0.01% |
48,000
+40,700
| +558% | +$407K |
|
4146
PUT
Sprout Social
SPT
$522M
| $279K | ﹤0.01% |
9,100
-16,500
| -64% | -$496K |
|
4147
CALL
Corvus Pharmaceuticals
CRVS
$1.12B
| $278K | ﹤0.01% |
52,000
+15,700
| +43% | +$117K |
|
4148
CALL
Dave Inc
DAVE
$5.17B
| $278K | ﹤0.01% |
3,200
+3,100
| +3,100% | +$208K |
|
4149
CALL
Payoneer
PAYO
$2.42B
| $278K | ﹤0.01% |
27,700
-451,700
| -94% | -$4.32M |
|
4150
PUT
PetMed Express
PETS
$43M
| $278K | ﹤0.01% |
57,700
+39,600
| +219% | +$186K |
|
Similar funds
Simplex Trading's Q4 2024 Portfolio in Review
As of Q4 2024, Simplex Trading held 10,008 positions worth $179B, up 4.8% from $170B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading's Q4 2024 filing shows 1,520 new, 3,222 increased, 3,616 reduced and 1,504 closed positions. Its largest new stake was Strategy Inc: 285,022 shares worth $82.5M. The largest sale was NVIDIA, an estimated $133M.
By sector, the portfolio is most concentrated in Technology at 0.68% of assets, up from 0.4% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q4 2024 buy was Strategy Inc: 285,022 shares worth $82.5M.
- Simplex Trading added most to Apple in Q4 2024, an estimated $552M increase.
- Simplex Trading's biggest Q4 2024 reduction was NVIDIA, cutting an estimated $133M.
- Simplex Trading fully exited Pinduoduo in Q4 2024, selling an estimated $82.6M.
- Simplex Trading's ten largest holdings make up 49% of its $179B portfolio in Q4 2024.
- Simplex Trading opened 1,520 new positions and closed 1,504 in Q4 2024.
- Simplex Trading's portfolio value rose 4.8% quarter-over-quarter to $179B.
Based on Simplex Trading's 13F filing for Q4 2024, filed 11 Feb 2025.