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 | |
|---|---|---|---|---|---|---|
5426
CALL
Byrna Technologies
BYRN
$103M
| $81K | ﹤0.01% |
4,800
-23,500
| -83% | -$278K |
|
5427
Clearwater Paper
CLW
$339M
| $81K | ﹤0.01% |
2,841
+2,782
| +4,715% | +$109K |
|
5428
PUT
Cardiff Oncology
CRDF
$66.5M
| $81K | ﹤0.01% |
30,600
+13,500
| +79% | +$31.9K |
|
|
DADA
5429
PUT
DELISTED
Dada Nexus
DADA
| $81K | ﹤0.01% |
42,900
+27,700
| +182% | +$36.3K |
|
5430
Matthews International
MATW
$866M
| $81K | ﹤0.01% |
3,534
-2,377
| -40% | -$59.9K |
|
5431
CALL
Grupo Aeroportuario Centro Norte
OMAB
$5.16B
| $81K | ﹤0.01% |
1,200
| – | – |
|
5432
PUT
Red Cat Holdings
RCAT
$1.15B
| $81K | ﹤0.01% |
32,000
+30,300
| +1,782% | +$72.2K |
|
5433
Repay Holdings
RPAY
$331M
| $81K | ﹤0.01% |
+10,008
| New | +$88.4K |
|
|
SRDX
5434
CALL
DELISTED
Surmodics
SRDX
| $81K | ﹤0.01% |
+2,100
| New | +$84.9K |
|
5435
CALL
Stratasys
SSYS
$679M
| $81K | ﹤0.01% |
9,800
+3,500
| +56% | +$27.6K |
|
5436
PUT
TransAlta
TAC
$3.95B
| $81K | ﹤0.01% |
+7,900
| New | +$65.7K |
|
5437
CALL
Willdan Group
WLDN
$1.04B
| $81K | ﹤0.01% |
+2,000
| New | +$71.9K |
|
5438
PUT
Brink's
BCO
$4.88B
| $80K | ﹤0.01% |
700
+400
| +133% | +$42.3K |
|
5439
CALL
Viant Technology
DSP
$236M
| $80K | ﹤0.01% |
7,300
+3,200
| +78% | +$34.1K |
|
|
MAXN
5440
CALL
DELISTED
Maxeon Solar Technologies
MAXN
| $80K | ﹤0.01% |
8,252
-7,348
| -47% | -$118K |
|
5441
PUT
Pyxis Oncology
PYXS
$168M
| $80K | ﹤0.01% |
21,800
+21,200
| +3,533% | +$74.2K |
|
|
SVC
5442
PUT
Service Properties Trust
SVC
$1.04B
| $80K | ﹤0.01% |
3,540
-60
| -2% | -$1.49K |
|
5443
PUT
NCR Voyix
VYX
$1.14B
| $80K | ﹤0.01% |
6,500
+5,600
| +622% | +$74.8K |
|
|
VFLQ
5444
PUT
DELISTED
Vanguard U.S. Liquidity Factor ETF
VFLQ
| $80K | ﹤0.01% |
+500
| New | +$80K |
|
5445
PUT
Black Hills Corp
BKH
$5.42B
| $79K | ﹤0.01% |
1,300
-3,400
| -72% | -$198K |
|
|
SRTA
5446
Strata Critical Medical Inc
SRTA
$434M
| $79K | ﹤0.01% |
26,954
-4,295
| -14% | -$13.7K |
|
5447
PUT
Corvus Pharmaceuticals
CRVS
$1.12B
| $79K | ﹤0.01% |
15,100
+11,000
| +268% | +$39.5K |
|
|
GOOD
5448
CALL
Gladstone Commercial Corp
GOOD
$605M
| $79K | ﹤0.01% |
4,900
+500
| +11% | +$7.5K |
|
|
KNDI
5449
Kandi Technologies Group
KNDI
$67.5M
| $79K | ﹤0.01% |
38,828
+37,067
| +2,105% | +$67.4K |
|
5450
CALL
NBT Bancorp
NBTB
$2.74B
| $79K | ﹤0.01% |
1,800
+1,700
| +1,700% | +$76.7K |
|
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.