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 | |
|---|---|---|---|---|---|---|
4001
CALL
Chefs' Warehouse
CHEF
$4.09B
| $340K | ﹤0.01% |
8,100
-16,100
| -67% | -$650K |
|
|
MFA
4002
PUT
MFA Financial
MFA
$935M
| $340K | ﹤0.01% |
26,800
-5,600
| -17% | -$66.1K |
|
4003
PUT
Plains GP Holdings
PAGP
$5.2B
| $340K | ﹤0.01% |
18,400
-900
| -5% | -$17.1K |
|
4004
CALL
Black Stone Minerals
BSM
$3.14B
| $339K | ﹤0.01% |
22,500
-13,500
| -38% | -$202K |
|
4005
Global Ship Lease
GSL
$1.57B
| $339K | ﹤0.01% |
12,728
+537
| +4% | +$13.8K |
|
4006
KeyCorp
KEY
$24.3B
| $339K | ﹤0.01% |
+20,295
| New | +$322K |
|
4007
CALL
Pool Corp
POOL
$7B
| $339K | ﹤0.01% |
900
-2,300
| -72% | -$796K |
|
4008
CALL
Prothena Corp
PRTA
$448M
| $339K | ﹤0.01% |
20,300
+8,400
| +71% | +$181K |
|
4009
Tucows
TCX
$101M
| $339K | ﹤0.01% |
16,242
+15,631
| +2,558% | +$341K |
|
4010
PUT
Excelerate Energy
EE
$1.19B
| $338K | ﹤0.01% |
15,400
-3,300
| -18% | -$64K |
|
4011
CALL
SIGA Technologies
SIGA
$240M
| $338K | ﹤0.01% |
50,200
+39,400
| +365% | +$344K |
|
|
AD
4012
PUT
Array Digital Infrastructure
AD
$3.03B
| $338K | ﹤0.01% |
6,200
-800
| -11% | -$43.8K |
|
4013
CALL
BlueLinx
BXC
$465M
| $337K | ﹤0.01% |
3,200
-2,900
| -48% | -$296K |
|
4014
Jack in the Box
JACK
$308M
| $337K | ﹤0.01% |
+7,248
| New | +$364K |
|
4015
Mattel
MAT
$4.49B
| $337K | ﹤0.01% |
+17,735
| New | +$327K |
|
4016
USA Compression Partners
USAC
$3.75B
| $337K | ﹤0.01% |
14,742
+4,343
| +42% | +$98.7K |
|
4017
B&G Foods
BGS
$297M
| $336K | ﹤0.01% |
+37,907
| New | +$321K |
|
|
BBBY
4018
PUT
Bed Bath & Beyond
BBBY
$503M
| $336K | ﹤0.01% |
36,740
-63,140
| -63% | -$651K |
|
4019
CALL
National Bank Holdings
NBHC
$1.9B
| $336K | ﹤0.01% |
8,000
| – | – |
|
4020
Crescent Energy
CRGY
$3.44B
| $335K | ﹤0.01% |
30,613
-80,502
| -72% | -$920K |
|
4021
PUT
Herc Holdings
HRI
$4.95B
| $334K | ﹤0.01% |
+2,100
| New | +$298K |
|
4022
iShares Core MSCI EAFE ETF
IEFA
$187B
| $334K | ﹤0.01% |
4,283
-687
| -14% | -$51.4K |
|
4023
PUT
Jazz Pharmaceuticals
JAZZ
$16.1B
| $334K | ﹤0.01% |
3,000
+1,200
| +67% | +$132K |
|
4024
iShares Mortgage Real Estate ETF
REM
$553M
| $333K | ﹤0.01% |
14,037
-7,949
| -36% | -$187K |
|
|
ASRT
4025
CALL
DELISTED
Assertio
ASRT
| $332K | ﹤0.01% |
18,793
+5,100
| +37% | +$101K |
|
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.