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 | |
|---|---|---|---|---|---|---|
6001
iShares Micro-Cap ETF
IWC
$1.45B
| $44K | ﹤0.01% |
+357
| New | +$43.1K |
|
|
KLG
6002
DELISTED
WK Kellogg Co
KLG
| $44K | ﹤0.01% |
+2,624
| New | +$45K |
|
6003
Medifast
MED
$110M
| $44K | ﹤0.01% |
2,334
-33,005
| -93% | -$636K |
|
|
MRUS
6004
CALL
DELISTED
Merus
MRUS
| $44K | ﹤0.01% |
900
-9,800
| -92% | -$512K |
|
6005
PUT
SGHC Ltd
SGHC
$7.15B
| $44K | ﹤0.01% |
12,200
| – | – |
|
6006
Skyward Specialty Insurance
SKWD
$2.43B
| $44K | ﹤0.01% |
1,099
+1,034
| +1,591% | +$40.1K |
|
6007
ProShares UltraShort Russell2000
TWM
$43.8M
| $44K | ﹤0.01% |
970
-1,326
| -58% | -$66.5K |
|
6008
PUT
UNIFI
UFI
$114M
| $44K | ﹤0.01% |
6,000
-1,300
| -18% | -$8.18K |
|
6009
PUT
UL Solutions
ULS
$18.6B
| $44K | ﹤0.01% |
900
+800
| +800% | +$38.9K |
|
6010
CALL
Agilysys
AGYS
$3.04B
| $43K | ﹤0.01% |
400
-400
| -50% | -$42.8K |
|
6011
PUT
CONMED
CNMD
$1.41B
| $43K | ﹤0.01% |
+600
| New | +$42.3K |
|
6012
PUT
CubeSmart
CUBE
$9.34B
| $43K | ﹤0.01% |
800
-7,600
| -90% | -$377K |
|
6013
CALL
Dine Brands
DIN
$457M
| $43K | ﹤0.01% |
1,400
-500
| -26% | -$16.1K |
|
|
GOOS
6014
Canada Goose Holdings
GOOS
$904M
| $43K | ﹤0.01% |
+3,453
| New | +$39.1K |
|
6015
CALL
Harmonic Inc
HLIT
$1.22B
| $43K | ﹤0.01% |
3,000
+2,100
| +233% | +$28.1K |
|
6016
CALL
Ivanhoe Electric
IE
$1.48B
| $43K | ﹤0.01% |
5,100
-7,100
| -58% | -$59.6K |
|
6017
Inspired Entertainment
INSE
$182M
| $43K | ﹤0.01% |
4,718
+3,018
| +178% | +$26.7K |
|
6018
PUT
O-I Glass
OI
$1.13B
| $43K | ﹤0.01% |
3,300
-2,900
| -47% | -$34.7K |
|
6019
Sagimet Biosciences
SGMT
$451M
| $43K | ﹤0.01% |
15,772
-6,062
| -28% | -$18.7K |
|
6020
PUT
SkyWater Technology
SKYT
$1.6B
| $43K | ﹤0.01% |
4,800
+1,700
| +55% | +$14.2K |
|
6021
CALL
Teledyne Technologies
TDY
$30.1B
| $43K | ﹤0.01% |
100
-100
| -50% | -$41.5K |
|
6022
Veracyte
VCYT
$4.77B
| $43K | ﹤0.01% |
+1,285
| New | +$36.2K |
|
|
AMPS
6023
PUT
DELISTED
Altus Power
AMPS
| $43K | ﹤0.01% |
13,800
+12,900
| +1,433% | +$46K |
|
|
PETQ
6024
CALL
DELISTED
PetIQ, Inc. Class A Common Stock
PETQ
| $43K | ﹤0.01% |
1,400
-1,200
| -46% | -$32.4K |
|
|
AZEK
6025
PUT
DELISTED
The AZEK Co
AZEK
| $42K | ﹤0.01% |
900
-38,500
| -98% | -$1.65M |
|
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.