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 | |
|---|---|---|---|---|---|---|
4226
Reddit
RDDT
$34.4B
| $273K | ﹤0.01% |
4,151
-33,205
| -89% | -$2.05M |
|
4227
CALL
LendingTree
TREE
$572M
| $272K | ﹤0.01% |
4,700
-15,600
| -77% | -$806K |
|
4228
Aehr Test Systems
AEHR
$2.28B
| $271K | ﹤0.01% |
21,162
-11,657
| -36% | -$169K |
|
4229
PUT
Century Aluminum
CENX
$4.35B
| $271K | ﹤0.01% |
16,700
+11,100
| +198% | +$168K |
|
4230
CALL
Amdocs
DOX
$5.83B
| $271K | ﹤0.01% |
3,100
+2,700
| +675% | +$227K |
|
4231
Manchester United
MANU
$4.03B
| $271K | ﹤0.01% |
16,775
-13,809
| -45% | -$231K |
|
4232
CALL
MDU Resources
MDU
$4.31B
| $271K | ﹤0.01% |
17,870
+4,693
| +36% | +$66.8K |
|
4233
CALL
Taboola.com
TBLA
$1.37B
| $271K | ﹤0.01% |
80,700
-30,900
| -28% | -$102K |
|
4234
CALL
Alight
ALIT
$523M
| $270K | ﹤0.01% |
1,825
-6,935
| -79% | -$996K |
|
|
EVRI
4235
PUT
DELISTED
Everi Holdings
EVRI
| $270K | ﹤0.01% |
20,600
+16,400
| +390% | +$193K |
|
4236
CALL
Old National Bancorp
ONB
$10.3B
| $270K | ﹤0.01% |
14,500
-2,700
| -16% | -$50.6K |
|
4237
PUT
Sun Communities
SUI
$15.3B
| $270K | ﹤0.01% |
2,000
+1,900
| +1,900% | +$250K |
|
4238
PUT
United Bankshares
UBSI
$6.71B
| $270K | ﹤0.01% |
7,300
+7,200
| +7,200% | +$263K |
|
4239
PUT
Diodes
DIOD
$3.69B
| $269K | ﹤0.01% |
4,200
-700
| -14% | -$48.5K |
|
4240
PUT
ITT
ITT
$17.8B
| $269K | ﹤0.01% |
1,800
-2,100
| -54% | -$286K |
|
4241
CALL
Robert Half
RHI
$4.04B
| $269K | ﹤0.01% |
4,000
-11,700
| -75% | -$741K |
|
|
AVDX
4242
CALL
DELISTED
AvidXchange
AVDX
| $268K | ﹤0.01% |
33,100
+11,200
| +51% | +$105K |
|
|
BDN
4243
Brandywine Realty Trust
BDN
$521M
| $268K | ﹤0.01% |
49,445
+28,730
| +139% | +$143K |
|
|
EXK
4244
CALL
Endeavour Silver
EXK
$2.29B
| $268K | ﹤0.01% |
68,100
-23,700
| -26% | -$87.1K |
|
|
DRD
4245
DRDGold
DRD
$1.79B
| $267K | ﹤0.01% |
27,792
+24,645
| +783% | +$228K |
|
4246
PUT
Radware
RDWR
$1.19B
| $267K | ﹤0.01% |
12,000
-216,900
| -95% | -$4.47M |
|
4247
PUT
Advanced Drainage Systems
WMS
$11.1B
| $267K | ﹤0.01% |
1,700
-600
| -26% | -$93.7K |
|
|
DCH
4248
PUT
Dauch Corp
DCH
$1.33B
| $266K | ﹤0.01% |
43,100
+5,000
| +13% | +$32.6K |
|
4249
PUT
Teekay
TK
$981M
| $266K | ﹤0.01% |
29,000
+12,900
| +80% | +$107K |
|
4250
CALL
10x Genomics
TXG
$5.97B
| $266K | ﹤0.01% |
11,800
-6,700
| -36% | -$139K |
|
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.