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 | |
|---|---|---|---|---|---|---|
6576
CALL
Caesarstone
CSTE
$71.9M
| $27K | ﹤0.01% |
+6,700
| New | +$37.1K |
|
6577
CALL
Cytosorbents Corp
CTSO
$22.7M
| $27K | ﹤0.01% |
8,200
+7,200
| +720% | +$21.6K |
|
6578
F&G Annuities & Life
FG
$3.78B
| $27K | ﹤0.01% |
+1,510
| New | +$30.2K |
|
6579
Liberty Media Series A
FWONA
$22.5B
| $27K | ﹤0.01% |
+429
| New | +$25.9K |
|
6580
CALL
ESS Tech
GWH
$22.1M
| $27K | ﹤0.01% |
+1,320
| New | +$36.8K |
|
6581
CALL
Hain Celestial
HAIN
$44.9M
| $27K | ﹤0.01% |
1,600
-100
| -6% | -$1.82K |
|
6582
PUT
Heartland Express
HTLD
$946M
| $27K | ﹤0.01% |
1,700
-2,300
| -58% | -$37.4K |
|
6583
CALL
Iris Energy
IREN
$13.2B
| $27K | ﹤0.01% |
+9,000
| New | +$22.1K |
|
|
ITOS
6584
DELISTED
iTeos Therapeutics
ITOS
| $27K | ﹤0.01% |
2,040
-383
| -16% | -$6.86K |
|
6585
iShares US Healthcare ETF
IYH
$3.37B
| $27K | ﹤0.01% |
+500
| New | +$27.4K |
|
6586
CALL
KBR
KBR
$4.64B
| $27K | ﹤0.01% |
500
-12,400
| -96% | -$649K |
|
6587
PUT
Microvast
MVST
$272M
| $27K | ﹤0.01% |
21,900
+3,400
| +18% | +$4.94K |
|
|
NFGC
6588
PUT
New Found Gold
NFGC
$522M
| $27K | ﹤0.01% |
5,400
+3,100
| +135% | +$12.3K |
|
6589
PUT
OneSpaWorld
OSW
$2.62B
| $27K | ﹤0.01% |
2,300
-3,400
| -60% | -$37K |
|
6590
CALL
Prudential
PUK
$37.6B
| $27K | ﹤0.01% |
1,000
-4,700
| -82% | -$141K |
|
|
SCS
6591
PUT
DELISTED
Steelcase
SCS
| $27K | ﹤0.01% |
3,300
-21,300
| -87% | -$163K |
|
6592
SandRidge Energy
SD
$512M
| $27K | ﹤0.01% |
+1,943
| New | +$29.7K |
|
6593
PUT
NuScale Power
SMR
$2.96B
| $27K | ﹤0.01% |
3,000
-7,500
| -71% | -$75.2K |
|
6594
PUT
Smith & Nephew
SNN
$13.2B
| $27K | ﹤0.01% |
1,000
-4,000
| -80% | -$114K |
|
6595
State Street SPDR Portfolio S&P 400 Mid Cap ETF
SPMD
$18.3B
| $27K | ﹤0.01% |
+616
| New | +$27.6K |
|
6596
CALL
Sasol
SSL
$7.5B
| $27K | ﹤0.01% |
2,000
-500
| -20% | -$7.77K |
|
6597
Strategic Education
STRA
$1.85B
| $27K | ﹤0.01% |
303
+100
| +49% | +$8.85K |
|
6598
Stereotaxis
STXS
$125M
| $27K | ﹤0.01% |
13,417
+13,317
| +13,317% | +$30K |
|
6599
Tenaya Therapeutics
TNYA
$161M
| $27K | ﹤0.01% |
+9,813
| New | +$27.6K |
|
6600
CALL
Televisa
TV
$1.48B
| $27K | ﹤0.01% |
5,200
-6,800
| -57% | -$36.5K |
|
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.