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 | |
|---|---|---|---|---|---|---|
6451
PUT
American Battery Technology Co
ABAT
$280M
| $26K | ﹤0.01% |
25,100
+500
| +2% | +$520 |
|
6452
CALL
Amylyx Pharmaceuticals
AMLX
$2.19B
| $26K | ﹤0.01% |
8,300
-13,300
| -62% | -$29.9K |
|
6453
Anixa Biosciences
ANIX
$118M
| $26K | ﹤0.01% |
8,571
+4,345
| +103% | +$13.4K |
|
6454
CALL
Arrow Electronics
ARW
$10.5B
| $26K | ﹤0.01% |
200
-8,700
| -98% | -$1.1M |
|
6455
PUT
Blue Ridge Bankshares
BRBS
$312M
| $26K | ﹤0.01% |
9,300
| – | – |
|
6456
CBAK Energy Technology Ltd
CBAT
$43.1M
| $26K | ﹤0.01% |
21,188
-29,766
| -58% | -$33.4K |
|
6457
Cimpress
CMPR
$2.37B
| $26K | ﹤0.01% |
+318
| New | +$28.2K |
|
6458
CALL
CubeSmart
CUBE
$9.61B
| $26K | ﹤0.01% |
500
-6,100
| -92% | -$303K |
|
6459
PUT
DocGo
DCGO
$64.2M
| $26K | ﹤0.01% |
8,100
-113,300
| -93% | -$385K |
|
|
EB
6460
PUT
DELISTED
Eventbrite
EB
| $26K | ﹤0.01% |
9,700
-11,400
| -54% | -$43.4K |
|
6461
PUT
Eastern Bankshares
EBC
$5.27B
| $26K | ﹤0.01% |
1,600
-500
| -24% | -$7.91K |
|
6462
PUT
Empire State Realty Trust
ESRT
$1B
| $26K | ﹤0.01% |
2,400
+300
| +14% | +$3.13K |
|
6463
Galectin Therapeutics
GALT
$230M
| $26K | ﹤0.01% |
9,790
-1,564
| -14% | -$3.84K |
|
6464
CALL
Genasys
GNSS
$76.5M
| $26K | ﹤0.01% |
+7,400
| New | +$21.2K |
|
6465
IQVIA
IQV
$40.7B
| $26K | ﹤0.01% |
+110
| New | +$26K |
|
6466
PUT
Kite Realty
KRG
$5.86B
| $26K | ﹤0.01% |
1,000
| – | – |
|
6467
CALL
Littelfuse
LFUS
$10.4B
| $26K | ﹤0.01% |
100
-2,300
| -96% | -$593K |
|
6468
PUT
Nordson
NDSN
$16.4B
| $26K | ﹤0.01% |
100
-100
| -50% | -$24.4K |
|
6469
PUT
Newegg Commerce
NEGG
$273M
| $26K | ﹤0.01% |
1,765
+155
| +10% | +$2.65K |
|
6470
CALL
Insperity
NSP
$2.03B
| $26K | ﹤0.01% |
300
-700
| -70% | -$64.8K |
|
6471
CALL
Oxford Industries
OXM
$581M
| $26K | ﹤0.01% |
300
+200
| +200% | +$18.4K |
|
6472
CALL
PCB Bancorp
PCB
$394M
| $26K | ﹤0.01% |
1,400
| – | – |
|
6473
CALL
Personalis
PSNL
$1.25B
| $26K | ﹤0.01% |
+5,000
| New | +$20.6K |
|
6474
CALL
Riley Exploration Permian
REPX
$728M
| $26K | ﹤0.01% |
1,000
| – | – |
|
6475
Tradr 2X Long Innovation ETFShort Innovation Daily ETF
SARK
$45.2M
| $26K | ﹤0.01% |
+344
| New | +$31.3K |
|
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.