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 | |
|---|---|---|---|---|---|---|
5826
HEICO Corp Class A
HEI.A
$36B
| $53K | ﹤0.01% |
262
+146
| +126% | +$27.7K |
|
5827
CALL
Heron Therapeutics
HRTX
$93.9M
| $53K | ﹤0.01% |
27,000
+11,300
| +72% | +$27K |
|
5828
CALL
Jakks Pacific
JAKK
$301M
| $53K | ﹤0.01% |
2,100
-2,000
| -49% | -$44K |
|
|
NXDR
5829
PUT
Nextdoor Holdings
NXDR
$847M
| $53K | ﹤0.01% |
21,600
-104,800
| -83% | -$269K |
|
5830
PUT
Liberty Broadband Class C
LBRDK
$4.88B
| $53K | ﹤0.01% |
700
+300
| +75% | +$18.5K |
|
5831
Oportun Financial
OPRT
$255M
| $53K | ﹤0.01% |
19,208
-3,376
| -15% | -$9.8K |
|
5832
CALL
Quantum-Si Incorporated
QSI
$155M
| $53K | ﹤0.01% |
60,200
-28,200
| -32% | -$27.4K |
|
5833
PUT
Veritone
VERI
$101M
| $53K | ﹤0.01% |
15,000
+10,900
| +266% | +$33.3K |
|
5834
PUT
Workhorse Group
WKHS
$33.2M
| $53K | ﹤0.01% |
409
+105
| +35% | +$17.8K |
|
5835
PUT
Willdan Group
WLDN
$1.04B
| $53K | ﹤0.01% |
+1,300
| New | +$46.7K |
|
5836
PUT
Ziff Davis
ZD
$1.96B
| $53K | ﹤0.01% |
1,100
-3,300
| -75% | -$157K |
|
|
AIFU
5837
AIFU Inc
AIFU
$206M
| $53K | ﹤0.01% |
+93
| New | +$52.1K |
|
|
EQC
5838
PUT
DELISTED
Equity Commonwealth
EQC
| $53K | ﹤0.01% |
2,700
-36,500
| -93% | -$727K |
|
|
AGR
5839
PUT
DELISTED
Avangrid, Inc.
AGR
| $53K | ﹤0.01% |
1,500
-600
| -29% | -$21.4K |
|
5840
Amdocs
DOX
$5.92B
| $52K | ﹤0.01% |
601
-3,199
| -84% | -$269K |
|
5841
Euronet Worldwide
EEFT
$2.72B
| $52K | ﹤0.01% |
+527
| New | +$53.3K |
|
5842
PUT
Embecta
EMBC
$216M
| $52K | ﹤0.01% |
3,700
-5,200
| -58% | -$75.6K |
|
5843
PUT
Energy Recovery
ERII
$446M
| $52K | ﹤0.01% |
3,000
| – | – |
|
5844
Genmab
GMAB
$17.7B
| $52K | ﹤0.01% |
+2,170
| New | +$58K |
|
|
OPLN
5845
CALL
Openlane
OPLN
$4.21B
| $52K | ﹤0.01% |
3,100
+300
| +11% | +$5.14K |
|
|
ODP
5846
DELISTED
ODP
ODP
| $52K | ﹤0.01% |
+1,778
| New | +$59.3K |
|
5847
PUT
United States Gasoline Fund
UGA
$142M
| $52K | ﹤0.01% |
900
| – | – |
|
|
ADVM
5848
CALL
DELISTED
Adverum Biotechnologies
ADVM
| $51K | ﹤0.01% |
7,400
-2,900
| -28% | -$21.1K |
|
5849
PUT
AirSculpt Technologies
AIRS
$339M
| $51K | ﹤0.01% |
+10,200
| New | +$44.3K |
|
5850
PUT
Artisan Partners
APAM
$2.79B
| $51K | ﹤0.01% |
1,200
-1,200
| -50% | -$49.5K |
|
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.