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 |
Walmart Inc
WMT
|
+$43.6M |
| 2 |
Apple
AAPL
|
+$40.9M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$37.7M |
| 4 |
Citigroup
C
|
+$34.2M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$32.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$189M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 3 |
NVIDIA
NVDA
|
+$115M |
| 4 |
Tesla
TSLA
|
+$52M |
| 5 |
Meta Platforms (Facebook)
META
|
+$49M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.42% |
| 2 | Consumer Discretionary | 0.2% |
| 3 | Healthcare | 0.17% |
| 4 | Industrials | 0.15% |
| 5 | Communication Services | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
TCS
5501
PUT
DELISTED
THE CONTAINER STORE GROUP, INC.
TCS
| $73K | ﹤0.01% |
1,427
+1,300
| +1,024% | +$86.5K |
|
5502
American Superconductor
AMSC
$1.42B
| $72K | ﹤0.01% |
14,846
+3,211
| +28% | +$16.1K |
|
5503
Anixa Biosciences
ANIX
$116M
| $72K | ﹤0.01% |
16,962
+468
| +3% | +$2.05K |
|
5504
CALL
C4 Therapeutics
CCCC
$385M
| $72K | ﹤0.01% |
23,100
+22,700
| +5,675% | +$134K |
|
5505
CALL
eHealth
EHTH
$42.2M
| $72K | ﹤0.01% |
7,700
-39,500
| -84% | -$311K |
|
|
AGNT
5506
PUT
AGNT Inc
AGNT
$666M
| $72K | ﹤0.01% |
5,700
-90,400
| -94% | -$1.21M |
|
5507
CALL
CarParts.com
PRTS
$43.7M
| $72K | ﹤0.01% |
1,350
-40
| -3% | -$2.53K |
|
|
SACH
5508
CALL
Sachem Capital Corp
SACH
$39.1M
| $72K | ﹤0.01% |
19,500
+400
| +2% | +$1.47K |
|
5509
CALL
Shutterstock
SSTK
$198M
| $72K | ﹤0.01% |
1,000
+900
| +900% | +$62.9K |
|
5510
Toll Brothers
TOL
$13.6B
| $72K | ﹤0.01% |
1,200
| – | – |
|
5511
CALL
United States Gasoline Fund
UGA
$142M
| $72K | ﹤0.01% |
1,200
-12,500
| -91% | -$738K |
|
|
FOCS
5512
PUT
DELISTED
Focus Financial Partners Inc. Class A
FOCS
| $72K | ﹤0.01% |
1,400
+200
| +17% | +$9.64K |
|
5513
CALL
Associated Banc-Corp
ASB
$5.83B
| $71K | ﹤0.01% |
4,000
-200
| -5% | -$4.38K |
|
5514
CALL
Cipher Digital
CIFR
$9.13B
| $71K | ﹤0.01% |
+30,600
| New | +$47K |
|
5515
Castle Biosciences
CSTL
$849M
| $71K | ﹤0.01% |
+3,138
| New | +$76.7K |
|
5516
ProShares UltraShort Gold
GLL
$127M
| $71K | ﹤0.01% |
666
+625
| +1,524% | +$72.7K |
|
5517
CALL
IAMGOLD
IAG
$8.2B
| $71K | ﹤0.01% |
26,200
+5,200
| +25% | +$13.2K |
|
5518
PUT
Navigator Holdings
NVGS
$1.38B
| $71K | ﹤0.01% |
5,100
+1,200
| +31% | +$15.6K |
|
5519
CALL
Odyssey Marine Exploration
OMEX
$34.9M
| $71K | ﹤0.01% |
22,000
+20,300
| +1,194% | +$65.1K |
|
|
ONTF
5520
CALL
DELISTED
ON24
ONTF
| $71K | ﹤0.01% |
8,200
+7,700
| +1,540% | +$68K |
|
|
PPTA
5521
Perpetua Resources
PPTA
$2.3B
| $71K | ﹤0.01% |
+15,983
| New | +$55.4K |
|
5522
Red Robin
RRGB
$145M
| $71K | ﹤0.01% |
+5,027
| New | +$50.9K |
|
5523
CALL
Strategic Education
STRA
$1.85B
| $71K | ﹤0.01% |
+800
| New | +$70.8K |
|
5524
PUT
Tradeweb Markets
TW
$21.4B
| $71K | ﹤0.01% |
900
-22,500
| -96% | -$1.63M |
|
|
UDMY
5525
CALL
DELISTED
Udemy
UDMY
| $71K | ﹤0.01% |
8,100
-9,500
| -54% | -$100K |
|
Similar funds
Simplex Trading's Q1 2023 Portfolio in Review
As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.
By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.
- Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
- Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
- Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
- Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
- Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
- Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
- Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.
Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.