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 | |
|---|---|---|---|---|---|---|
|
KLRS
6976
CALL
Kalaris Therapeutics
KLRS
$81.1M
| $14K | ﹤0.01% |
774
-1,583
| -67% | -$27.7K |
|
|
JOYY
6977
PUT
JOYY Inc
JOYY
$3.73B
| $14K | ﹤0.01% |
400
| – | – |
|
|
SBT
6978
CALL
DELISTED
Sterling Bancorp, Inc. Common Stock
SBT
| $14K | ﹤0.01% |
+3,200
| New | +$17.4K |
|
|
ME
6979
DELISTED
23andMe Holding Co
ME
| $14K | ﹤0.01% |
2,073
-450
| -18% | -$3.36K |
|
|
ML
6980
DELISTED
MoneyLion Inc.
ML
| $14K | ﹤0.01% |
+342
| New | +$18.5K |
|
6981
PUT
AAR Corp
AIR
$5.47B
| $13K | ﹤0.01% |
200
-1,300
| -87% | -$86K |
|
6982
PUT
Angi Inc
ANGI
$251M
| $13K | ﹤0.01% |
510
-180
| -26% | -$4.33K |
|
6983
PUT
Artivion
AORT
$1.33B
| $13K | ﹤0.01% |
+500
| New | +$13K |
|
6984
PUT
Arrow Electronics
ARW
$10.5B
| $13K | ﹤0.01% |
100
-9,800
| -99% | -$1.24M |
|
|
LONA
6985
LeonaBio Inc
LONA
$66.4M
| $13K | ﹤0.01% |
2,935
+1,634
| +126% | +$38.3K |
|
6986
CALL
Pathward Financial
CASH
$1.87B
| $13K | ﹤0.01% |
200
-300
| -60% | -$19.3K |
|
6987
Certara
CERT
$1.25B
| $13K | ﹤0.01% |
+1,152
| New | +$15.2K |
|
|
CODX
6988
Co-Diagnostics
CODX
$5.79M
| $13K | ﹤0.01% |
358
-1,803
| -83% | -$69.2K |
|
6989
CALL
Cardiff Oncology
CRDF
$60.7M
| $13K | ﹤0.01% |
4,900
+3,500
| +250% | +$8.27K |
|
6990
CALL
Commercial Vehicle Group
CVGI
$147M
| $13K | ﹤0.01% |
4,200
-8,400
| -67% | -$34.2K |
|
6991
CALL
Dole
DOLE
$1.37B
| $13K | ﹤0.01% |
800
-193,600
| -100% | -$2.89M |
|
6992
Douglas Elliman
DOUG
$158M
| $13K | ﹤0.01% |
7,463
-1,198
| -14% | -$2.05K |
|
6993
CALL
First Hawaiian
FHB
$3.45B
| $13K | ﹤0.01% |
+600
| New | +$14K |
|
|
MRDN
6994
Meridian Holdings Inc
MRDN
$139M
| $13K | ﹤0.01% |
465
-129
| -22% | -$3.7K |
|
6995
PUT
HBT Financial
HBT
$1.33B
| $13K | ﹤0.01% |
+600
| New | +$13.1K |
|
|
HI
6996
PUT
DELISTED
Hillenbrand
HI
| $13K | ﹤0.01% |
+500
| New | +$17.6K |
|
6997
PUT
HUB Group
HUBG
$2.9B
| $13K | ﹤0.01% |
300
+200
| +200% | +$8.86K |
|
6998
Hyster-Yale Materials Handling
HY
$578M
| $13K | ﹤0.01% |
+216
| New | +$14.1K |
|
|
KALV
6999
PUT
DELISTED
KalVista Pharmaceuticals
KALV
| $13K | ﹤0.01% |
1,200
-4,300
| -78% | -$54.1K |
|
7000
CALL
Korea Electric Power
KEP
$14.7B
| $13K | ﹤0.01% |
1,800
+1,600
| +800% | +$12.2K |
|
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.