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 | |
|---|---|---|---|---|---|---|
4076
PTC
PTC
$14.7B
| $314K | ﹤0.01% |
+1,741
| New | +$306K |
|
4077
PUT
Rhythm Pharmaceuticals
RYTM
$7.41B
| $314K | ﹤0.01% |
6,000
+3,800
| +173% | +$182K |
|
4078
Webster Financial
WBS
$12.5B
| $314K | ﹤0.01% |
+6,750
| New | +$310K |
|
|
AGEN
4079
Agenus
AGEN
$275M
| $313K | ﹤0.01% |
+57,210
| New | +$428K |
|
4080
Core & Main
CNM
$8.23B
| $313K | ﹤0.01% |
+7,052
| New | +$338K |
|
4081
CALL
GoodRx Holdings
GDRX
$1.06B
| $313K | ﹤0.01% |
45,200
-56,800
| -56% | -$446K |
|
4082
CALL
Genworth Financial
GNW
$3.85B
| $313K | ﹤0.01% |
45,700
-28,900
| -39% | -$190K |
|
|
AXNX
4083
CALL
DELISTED
Axonics, Inc. Common Stock
AXNX
| $313K | ﹤0.01% |
4,500
-7,800
| -63% | -$535K |
|
4084
PUT
Albertsons Companies
ACI
$5.67B
| $312K | ﹤0.01% |
16,900
-16,200
| -49% | -$317K |
|
4085
Leggett & Platt
LEG
$1.47B
| $312K | ﹤0.01% |
22,926
+12,305
| +116% | +$154K |
|
4086
Bank OZK
OZK
$5.62B
| $312K | ﹤0.01% |
+7,272
| New | +$310K |
|
4087
PUT
Yelp
YELP
$1.51B
| $312K | ﹤0.01% |
8,900
-11,500
| -56% | -$402K |
|
4088
argenx
ARGX
$54.6B
| $311K | ﹤0.01% |
+574
| New | +$290K |
|
4089
PUT
Arrowhead Research
ARWR
$12.1B
| $311K | ﹤0.01% |
16,100
-19,200
| -54% | -$469K |
|
4090
Service Corp International
SCI
$11.7B
| $311K | ﹤0.01% |
+3,944
| New | +$300K |
|
4091
CALL
Brunswick
BC
$5.33B
| $310K | ﹤0.01% |
3,700
+3,000
| +429% | +$233K |
|
4092
CALL
Fidelity National Financial
FNF
$14.6B
| $310K | ﹤0.01% |
5,000
-4,900
| -49% | -$275K |
|
|
TDAY
4093
PUT
USA Today Co
TDAY
$1.27B
| $310K | ﹤0.01% |
55,200
-2,800
| -5% | -$13.6K |
|
4094
Taboola.com
TBLA
$1.37B
| $310K | ﹤0.01% |
92,370
-156,674
| -63% | -$516K |
|
|
VRN
4095
PUT
DELISTED
Veren
VRN
| $309K | ﹤0.01% |
50,300
-28,000
| -36% | -$200K |
|
4096
Cadence Design Systems
CDNS
$95.1B
| $308K | ﹤0.01% |
1,137
-2,536
| -69% | -$701K |
|
4097
CALL
Vita Coco
COCO
$3.97B
| $308K | ﹤0.01% |
10,900
+400
| +4% | +$10.6K |
|
4098
CALL
DTE Energy
DTE
$30.4B
| $308K | ﹤0.01% |
2,400
-5,900
| -71% | -$711K |
|
4099
PUT
Extreme Networks
EXTR
$3.92B
| $308K | ﹤0.01% |
20,500
-9,300
| -31% | -$132K |
|
4100
CALL
Simmons First National
SFNC
$3.39B
| $308K | ﹤0.01% |
14,300
+13,200
| +1,200% | +$268K |
|
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.