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 | |
|---|---|---|---|---|---|---|
4801
CALL
Mativ Holdings
MATV
$479M
| $135K | ﹤0.01% |
6,300
+3,300
| +110% | +$81.3K |
|
4802
MacroGenics
MGNX
$233M
| $135K | ﹤0.01% |
18,958
+669
| +4% | +$4.03K |
|
4803
CALL
Modine Manufacturing
MOD
$9.46B
| $135K | ﹤0.01% |
5,900
-3,300
| -36% | -$76.1K |
|
|
PLYA
4804
PUT
DELISTED
Playa Hotels & Resorts
PLYA
| $135K | ﹤0.01% |
+14,100
| New | +$112K |
|
4805
PUT
Ubiquiti
UI
$31.6B
| $135K | ﹤0.01% |
500
-2,200
| -81% | -$609K |
|
4806
CALL
Yelp
YELP
$1.54B
| $135K | ﹤0.01% |
4,400
-45,500
| -91% | -$1.37M |
|
|
WE
4807
CALL
DELISTED
WeWork Inc.
WE
| $135K | ﹤0.01% |
4,353
-4,885
| -53% | -$267K |
|
4808
CALL
Flowers Foods
FLO
$1.58B
| $134K | ﹤0.01% |
4,900
-7,900
| -62% | -$218K |
|
4809
CALL
Intapp
INTA
$2.44B
| $134K | ﹤0.01% |
+3,000
| New | +$105K |
|
4810
PUT
Photronics
PLAB
$1.65B
| $134K | ﹤0.01% |
8,100
+4,400
| +119% | +$77.4K |
|
4811
Playtika
PLTK
$1.53B
| $134K | ﹤0.01% |
+11,947
| New | +$120K |
|
|
RWT
4812
PUT
Redwood Trust
RWT
$588M
| $134K | ﹤0.01% |
20,000
+12,600
| +170% | +$94.4K |
|
4813
PUT
Upbound Group
UPBD
$1.22B
| $134K | ﹤0.01% |
5,500
+3,200
| +139% | +$82.4K |
|
|
BERY
4814
DELISTED
Berry Global Group, Inc.
BERY
| $134K | ﹤0.01% |
2,495
-37,161
| -94% | -$2.06M |
|
|
DO
4815
PUT
DELISTED
Diamond Offshore Drilling, Inc.
DO
| $134K | ﹤0.01% |
11,200
-4,900
| -30% | -$56.3K |
|
|
AKYA
4816
CALL
DELISTED
Akoya BioSciences
AKYA
| $133K | ﹤0.01% |
16,300
+3,800
| +30% | +$39.7K |
|
4817
CALL
Altisource Portfolio Solutions
ASPS
$58.4M
| $133K | ﹤0.01% |
3,638
+3,413
| +1,517% | +$165K |
|
|
4818
Altisource Portfolio Solutions
ASPS
$58.4M
| $133K | ﹤0.01% |
3,621
+472
| +15% | +$22.8K |
|
4819
PUT
Eastern Bankshares
EBC
$5.27B
| $133K | ﹤0.01% |
10,600
+10,500
| +10,500% | +$162K |
|
4820
CALL
Harrow
HROW
$1.44B
| $133K | ﹤0.01% |
6,300
-13,100
| -68% | -$223K |
|
4821
CALL
Hilltop Holdings
HTH
$2.26B
| $133K | ﹤0.01% |
+4,500
| New | +$142K |
|
4822
CALL
Oppenheimer Holdings
OPY
$1.18B
| $133K | ﹤0.01% |
+3,400
| New | +$149K |
|
4823
PUT
Rocket Pharmaceuticals
RCKT
$343M
| $133K | ﹤0.01% |
7,800
+5,800
| +290% | +$114K |
|
4824
Relay Therapeutics
RLAY
$4B
| $133K | ﹤0.01% |
8,083
+7,412
| +1,105% | +$133K |
|
4825
PUT
Teekay
TK
$996M
| $133K | ﹤0.01% |
21,600
-1,200
| -5% | -$6.41K |
|
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.