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 | |
|---|---|---|---|---|---|---|
5926
PUT
Arcosa
ACA
$7.13B
| $47K | ﹤0.01% |
500
| – | – |
|
5927
PUT
ANI Pharmaceuticals
ANIP
$1.8B
| $47K | ﹤0.01% |
800
-400
| -33% | -$24.4K |
|
5928
CALL
Arbe Robotics
ARBE
$71.6M
| $47K | ﹤0.01% |
24,800
+17,100
| +222% | +$35K |
|
5929
CVRx
CVRX
$134M
| $47K | ﹤0.01% |
5,393
+2,686
| +99% | +$24.4K |
|
5930
PUT
1-800-Flowers.com
FLWS
$244M
| $47K | ﹤0.01% |
6,000
+5,400
| +900% | +$48K |
|
5931
GFL Environmental
GFL
$15.1B
| $47K | ﹤0.01% |
+1,202
| New | +$48.1K |
|
5932
PUT
Gran Tierra Energy
GTE
$244M
| $47K | ﹤0.01% |
7,500
-1,200
| -14% | -$9.62K |
|
|
HUYA
5933
Huya Inc
HUYA
$561M
| $47K | ﹤0.01% |
9,340
+4,360
| +88% | +$18.7K |
|
5934
PUT
MacroGenics
MGNX
$235M
| $47K | ﹤0.01% |
14,400
-46,700
| -76% | -$182K |
|
5935
Navigator Holdings
NVGS
$1.38B
| $47K | ﹤0.01% |
2,930
-20,522
| -88% | -$335K |
|
5936
CALL
Pyxis Oncology
PYXS
$169M
| $47K | ﹤0.01% |
12,900
-200
| -2% | -$700 |
|
5937
PUT
RELX
RELX
$61.8B
| $47K | ﹤0.01% |
+1,000
| New | +$46.4K |
|
5938
CALL
Sight Sciences
SGHT
$285M
| $47K | ﹤0.01% |
+7,600
| New | +$51.1K |
|
5939
CALL
Champion Homes
SKY
$4.35B
| $47K | ﹤0.01% |
500
-1,000
| -67% | -$83.8K |
|
|
5940
PUT
Champion Homes
SKY
$4.35B
| $47K | ﹤0.01% |
500
-2,400
| -83% | -$201K |
|
5941
LendingTree
TREE
$450M
| $47K | ﹤0.01% |
+820
| New | +$42.4K |
|
5942
Vanguard Health Care ETF
VHT
$18.1B
| $47K | ﹤0.01% |
+169
| New | +$46.9K |
|
5943
Vanda Pharmaceuticals
VNDA
$302M
| $47K | ﹤0.01% |
10,194
-13,726
| -57% | -$73.6K |
|
|
DM
5944
DELISTED
Desktop Metal, Inc.
DM
| $47K | ﹤0.01% |
10,270
-121,254
| -92% | -$557K |
|
5945
Andersons Inc
ANDE
$2.41B
| $46K | ﹤0.01% |
+930
| New | +$46.1K |
|
5946
PUT
Arcturus Therapeutics
ARCT
$162M
| $46K | ﹤0.01% |
2,000
+600
| +43% | +$12.8K |
|
|
BASE
5947
PUT
DELISTED
Couchbase
BASE
| $46K | ﹤0.01% |
2,900
+2,300
| +383% | +$39.8K |
|
5948
PUT
Boston Omaha
BOC
$426M
| $46K | ﹤0.01% |
3,100
-1,100
| -26% | -$15.3K |
|
5949
Brady Corp
BRC
$4.4B
| $46K | ﹤0.01% |
+605
| New | +$43.1K |
|
5950
PUT
DLH Holdings
DLHC
$71M
| $46K | ﹤0.01% |
+5,000
| New | +$52.7K |
|
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.