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 | |
|---|---|---|---|---|---|---|
3926
PUT
OptimizeRx
OPRX
$119M
| $340K | ﹤0.01% |
+70,100
| New | +$392K |
|
3927
CALL
Pool Corp
POOL
$7B
| $340K | ﹤0.01% |
1,000
+100
| +11% | +$36.4K |
|
3928
CALL
Ultragenyx Pharmaceutical
RARE
$2.56B
| $340K | ﹤0.01% |
8,100
+1,100
| +16% | +$54.6K |
|
3929
Solid Power
SLDP
$475M
| $340K | ﹤0.01% |
180,282
+152,326
| +545% | +$188K |
|
|
ENFN
3930
DELISTED
Enfusion, Inc.
ENFN
| $340K | ﹤0.01% |
+33,025
| New | +$319K |
|
3931
MDU Resources
MDU
$4.31B
| $339K | ﹤0.01% |
+18,857
| New | +$331K |
|
3932
CALL
Outlook Therapeutics
OTLK
$169M
| $339K | ﹤0.01% |
179,500
+172,000
| +2,293% | +$708K |
|
|
SF
3933
CALL
Stifel
SF
$12.8B
| $339K | ﹤0.01% |
4,800
+2,550
| +113% | +$182K |
|
3934
PUT
Alight
ALIT
$523M
| $338K | ﹤0.01% |
2,445
-325
| -12% | -$47.7K |
|
|
FBRT
3935
CALL
Franklin BSP Realty Trust
FBRT
$596M
| $338K | ﹤0.01% |
27,000
+9,800
| +57% | +$127K |
|
3936
PUT
Procept Biorobotics
PRCT
$1.03B
| $338K | ﹤0.01% |
4,200
-6,800
| -62% | -$581K |
|
3937
PUT
WEC Energy
WEC
$37B
| $338K | ﹤0.01% |
3,600
-8,600
| -70% | -$834K |
|
3938
Corporacion America
CAAP
$4.26B
| $337K | ﹤0.01% |
18,087
-3,205
| -15% | -$60.3K |
|
|
CIM
3939
CALL
Chimera Investment
CIM
$1.06B
| $337K | ﹤0.01% |
27,200
+19,500
| +253% | +$292K |
|
3940
CALL
Dana Inc
DAN
$2.95B
| $337K | ﹤0.01% |
29,200
+10,100
| +53% | +$105K |
|
3941
PUT
Gaming and Leisure Properties
GLPI
$13B
| $337K | ﹤0.01% |
7,000
+3,300
| +89% | +$165K |
|
3942
CALL
Talkspace
TALK
$873M
| $337K | ﹤0.01% |
109,200
+80,100
| +275% | +$244K |
|
|
QLTB
3943
CALL
DELISTED
ISHARES BAA BA RATED CORP BOND FUND
QLTB
| $336K | ﹤0.01% |
2,100
-3,500
| -63% | -$560K |
|
3944
BGC Group
BGC
$5.73B
| $335K | ﹤0.01% |
36,976
+3,630
| +11% | +$35K |
|
|
DVAX
3945
PUT
DELISTED
Dynavax Technologies
DVAX
| $335K | ﹤0.01% |
26,300
+8,200
| +45% | +$99.2K |
|
3946
Legend Biotech
LEGN
$3.68B
| $335K | ﹤0.01% |
+10,310
| New | +$427K |
|
3947
StepStone Group
STEP
$3.65B
| $335K | ﹤0.01% |
5,802
+5,730
| +7,958% | +$355K |
|
3948
PUT
Tucows
TCX
$101M
| $335K | ﹤0.01% |
19,600
-38,600
| -66% | -$686K |
|
3949
CALL
Allison Transmission
ALSN
$10B
| $334K | ﹤0.01% |
3,100
+800
| +35% | +$87.3K |
|
3950
PUT
AMC Global Media
AMCX
$451M
| $334K | ﹤0.01% |
33,800
-26,100
| -44% | -$231K |
|
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.