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 | |
|---|---|---|---|---|---|---|
4751
CALL
Tyler Technologies
TYL
$13.7B
| $141K | ﹤0.01% |
400
-300
| -43% | -$97.6K |
|
4752
CALL
Visteon
VC
$2.85B
| $141K | ﹤0.01% |
+900
| New | +$139K |
|
4753
PUT
Assured Guaranty
AGO
$3.73B
| $140K | ﹤0.01% |
2,800
+2,700
| +2,700% | +$157K |
|
4754
JFrog
FROG
$8.88B
| $140K | ﹤0.01% |
7,151
-17,382
| -71% | -$387K |
|
4755
CALL
Gladstone Investment Corp
GAIN
$642M
| $140K | ﹤0.01% |
10,600
+3,100
| +41% | +$41.8K |
|
4756
CALL
Grid Dynamics Holdings
GDYN
$569M
| $140K | ﹤0.01% |
+12,300
| New | +$144K |
|
|
CBIO
4757
CALL
Crescent Biopharma
CBIO
$546M
| $140K | ﹤0.01% |
1,117
+1,090
| +4,037% | +$245K |
|
4758
PUT
Jack in the Box
JACK
$314M
| $140K | ﹤0.01% |
1,600
-30,500
| -95% | -$2.41M |
|
4759
CALL
Middlesex Water
MSEX
$1.07B
| $140K | ﹤0.01% |
1,800
-2,100
| -54% | -$169K |
|
4760
CALL
Omeros
OMER
$845M
| $140K | ﹤0.01% |
30,200
+23,400
| +344% | +$84.5K |
|
4761
PUT
Pliant Therapeutics
PLRX
$65M
| $140K | ﹤0.01% |
5,300
+3,600
| +212% | +$102K |
|
4762
CALL
Quad
QUAD
$479M
| $140K | ﹤0.01% |
32,800
+30,300
| +1,212% | +$134K |
|
|
NVRO
4763
CALL
DELISTED
NEVRO CORP.
NVRO
| $140K | ﹤0.01% |
3,900
| – | – |
|
4764
PUT
Breakwave Dry Bulk Shipping ETF
BDRY
$28.1M
| $139K | ﹤0.01% |
13,800
+3,300
| +31% | +$28.7K |
|
4765
CALL
NextCure
NXTC
$20.4M
| $139K | ﹤0.01% |
7,875
+3,742
| +91% | +$72.1K |
|
4766
CALL
RXO
RXO
$3.68B
| $139K | ﹤0.01% |
7,100
-8,000
| -53% | -$154K |
|
4767
PUT
Rhythm Pharmaceuticals
RYTM
$7.31B
| $139K | ﹤0.01% |
7,800
+2,600
| +50% | +$65.3K |
|
4768
PUT
Arbe Robotics
ARBE
$73.3M
| $138K | ﹤0.01% |
+43,400
| New | +$174K |
|
4769
CALL
Atomera
ATOM
$173M
| $138K | ﹤0.01% |
21,800
-14,300
| -40% | -$96.6K |
|
4770
CALL
Caleres
CAL
$432M
| $138K | ﹤0.01% |
6,400
+2,300
| +56% | +$55.2K |
|
4771
CALL
DT Midstream
DTM
$13.9B
| $138K | ﹤0.01% |
2,800
+300
| +12% | +$15.5K |
|
4772
PUT
FuelCell Energy
FCEL
$1.45B
| $138K | ﹤0.01% |
1,617
-4,013
| -71% | -$395K |
|
4773
PUT
Graco
GGG
$13.2B
| $138K | ﹤0.01% |
1,900
+1,000
| +111% | +$69.4K |
|
4774
PUT
MacroGenics
MGNX
$233M
| $138K | ﹤0.01% |
19,300
-2,800
| -13% | -$16.9K |
|
|
NVNO
4775
CALL
enVVeno Medical
NVNO
$6.94M
| $138K | ﹤0.01% |
849
| – | – |
|
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.