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 | |
|---|---|---|---|---|---|---|
5001
Brookfield Asset Management
BAM
$76.6B
| $125K | ﹤0.01% |
2,664
-7,120
| -73% | -$298K |
|
5002
PUT
Brunswick
BC
$5.18B
| $125K | ﹤0.01% |
1,500
-6,600
| -81% | -$513K |
|
5003
CALL
Clearwater Paper
CLW
$341M
| $125K | ﹤0.01% |
4,400
+3,400
| +340% | +$133K |
|
|
CUK
5004
CALL
DELISTED
Carnival PLC
CUK
| $125K | ﹤0.01% |
7,500
+5,700
| +317% | +$88.1K |
|
5005
Integer Holdings
ITGR
$3.42B
| $125K | ﹤0.01% |
+967
| New | +$118K |
|
5006
CALL
Liberty Latin America Class C
LILAK
$1.61B
| $125K | ﹤0.01% |
14,520
-7,810
| -35% | -$68.5K |
|
5007
PUT
Lindblad Expeditions
LIND
$1.95B
| $125K | ﹤0.01% |
13,600
-5,800
| -30% | -$53.9K |
|
5008
Planet Labs
PL
$7.21B
| $125K | ﹤0.01% |
+56,214
| New | +$125K |
|
5009
CALL
Rocket Pharmaceuticals
RCKT
$351M
| $125K | ﹤0.01% |
6,800
+5,700
| +518% | +$117K |
|
5010
PUT
Tronox
TROX
$999M
| $125K | ﹤0.01% |
8,600
+6,600
| +330% | +$94.1K |
|
5011
PUT
Sixth Street Specialty
TSLX
$1.64B
| $125K | ﹤0.01% |
6,100
+5,900
| +2,950% | +$124K |
|
5012
PUT
Veru
VERU
$35.6M
| $125K | ﹤0.01% |
16,270
+3,220
| +25% | +$27.8K |
|
5013
PUT
Invesco DB Base Metals Fund
DBB
$310M
| $124K | ﹤0.01% |
5,200
-19,000
| -79% | -$370K |
|
|
SKE
5014
CALL
Skeena Resources
SKE
$3.39B
| $124K | ﹤0.01% |
14,700
+10,100
| +220% | +$73.1K |
|
5015
PUT
Sonos
SONO
$1.72B
| $124K | ﹤0.01% |
10,100
+4,700
| +87% | +$59.7K |
|
|
CHX
5016
CALL
DELISTED
ChampionX
CHX
| $123K | ﹤0.01% |
4,100
-1,300
| -24% | -$41.1K |
|
5017
Dollar General
DG
$28.1B
| $123K | ﹤0.01% |
+1,455
| New | +$159K |
|
5018
CALL
Descartes Systems
DSGX
$6.39B
| $123K | ﹤0.01% |
1,200
+500
| +71% | +$49.7K |
|
5019
CALL
GFL Environmental
GFL
$14.9B
| $123K | ﹤0.01% |
3,100
-1,200
| -28% | -$48K |
|
5020
CALL
Global Net Lease
GNL
$1.86B
| $123K | ﹤0.01% |
14,700
-2,800
| -16% | -$23.5K |
|
5021
PUT
Kaiser Aluminum
KALU
$2.61B
| $123K | ﹤0.01% |
1,700
+1,400
| +467% | +$108K |
|
5022
CALL
Kingstone Companies
KINS
$293M
| $123K | ﹤0.01% |
13,500
+6,600
| +96% | +$51K |
|
5023
CALL
Maravai LifeSciences
MRVI
$996M
| $123K | ﹤0.01% |
14,900
-5,000
| -25% | -$43.2K |
|
5024
CALL
Madison Square Garden
MSGE
$3.73B
| $123K | ﹤0.01% |
2,900
-1,000
| -26% | -$39K |
|
5025
PUT
Wolverine World Wide
WWW
$1.64B
| $123K | ﹤0.01% |
7,100
-4,200
| -37% | -$58.1K |
|
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.