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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4176
CALL
Perella Weinberg Partners
PWP
$1.18B
| $287K | ﹤0.01% |
14,900
-33,500
| -69% | -$614K |
|
4177
CALL
Ternium
TX
$9.68B
| $287K | ﹤0.01% |
7,800
+2,900
| +59% | +$101K |
|
4178
Ceco Environmental
CECO
$3.94B
| $286K | ﹤0.01% |
10,142
+1,017
| +11% | +$28.6K |
|
4179
CALL
Dream Finders Homes
DFH
$1.49B
| $286K | ﹤0.01% |
7,900
-4,200
| -35% | -$129K |
|
4180
PUT
Fomento Económico Mexicano
FMX
$43.5B
| $286K | ﹤0.01% |
2,900
+2,600
| +867% | +$280K |
|
|
WCN
4181
CALL
Waste Connections
WCN
$42.7B
| $286K | ﹤0.01% |
1,600
-47,100
| -97% | -$8.52M |
|
|
SW
4182
PUT
Smurfit Westrock
SW
$26.6B
| $286K | ﹤0.01% |
+5,800
| New | +$264K |
|
4183
PUT
Westlake Corp
WLK
$9.25B
| $285K | ﹤0.01% |
1,900
-4,900
| -72% | -$705K |
|
4184
DHT Holdings
DHT
$2.99B
| $284K | ﹤0.01% |
+25,762
| New | +$284K |
|
4185
PUT
JFrog
FROG
$9.26B
| $284K | ﹤0.01% |
9,800
+1,700
| +21% | +$53.4K |
|
4186
Central Garden & Pet Co
CENT
$2.78B
| $283K | ﹤0.01% |
+7,770
| New | +$300K |
|
|
4187
Dream Finders Homes
DFH
$1.49B
| $283K | ﹤0.01% |
+7,841
| New | +$241K |
|
4188
CALL
Green Brick Partners
GRBK
$3.18B
| $283K | ﹤0.01% |
3,400
-1,000
| -23% | -$72.2K |
|
4189
Phathom Pharmaceuticals
PHAT
$930M
| $283K | ﹤0.01% |
+15,698
| New | +$219K |
|
4190
CALL
Rockwell Medical
RMTI
$27.6M
| $283K | ﹤0.01% |
7,140
+5,590
| +361% | +$150K |
|
4191
CALL
Gentherm
THRM
$1.29B
| $283K | ﹤0.01% |
6,100
+200
| +3% | +$9.93K |
|
|
EXE
4192
CALL
Expand Energy Corp
EXE
$21.2B
| $283K | ﹤0.01% |
159,800
-9,600
| -6% | -$733K |
|
4193
CALL
Daktronics
DAKT
$953M
| $282K | ﹤0.01% |
21,900
-2,700
| -11% | -$37.3K |
|
|
SUPV
4194
PUT
Grupo Supervielle
SUPV
$842M
| $282K | ﹤0.01% |
39,700
+30,800
| +346% | +$213K |
|
4195
PUT
RB Global
RBA
$21.7B
| $281K | ﹤0.01% |
3,500
-7,300
| -68% | -$592K |
|
4196
CALL
Tootsie Roll Industries
TR
$2.94B
| $281K | ﹤0.01% |
9,654
-3,713
| -28% | -$106K |
|
4197
CALL
Wave Life Sciences
WVE
$1.13B
| $281K | ﹤0.01% |
+34,300
| New | +$205K |
|
|
MRO
4198
DELISTED
Marathon Oil Corporation
MRO
| $281K | ﹤0.01% |
+10,567
| New | +$292K |
|
4199
Baytex Energy
BTE
$2.86B
| $280K | ﹤0.01% |
94,401
-2,141
| -2% | -$7.29K |
|
4200
PUT
Ecolab
ECL
$79.6B
| $280K | ﹤0.01% |
1,100
-30,200
| -96% | -$7.39M |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.