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 | |
|---|---|---|---|---|---|---|
5876
PUT
INNOVATE Corp
VATE
$111M
| $52K | ﹤0.01% |
1,760
+880
| +100% | +$25.7K |
|
|
TPC
5877
PUT
Tutor Perini Cor
TPC
$4.41B
| $52K | ﹤0.01% |
8,500
+1,900
| +29% | +$15.3K |
|
|
LILM
5878
CALL
DELISTED
Lilium N.V. Class A Ordinary Shares
LILM
| $52K | ﹤0.01% |
80,600
-42,000
| -34% | -$44.6K |
|
|
SUNW
5879
CALL
DELISTED
Sunworks, Inc.
SUNW
| $52K | ﹤0.01% |
36,600
+13,500
| +58% | +$25.4K |
|
|
NSTG
5880
CALL
DELISTED
NanoString Technologies, Inc.
NSTG
| $52K | ﹤0.01% |
5,300
+4,000
| +308% | +$39.6K |
|
|
ATHX
5881
DELISTED
Athersys, Inc. Common Stock
ATHX
| $52K | ﹤0.01% |
42,409
-27,161
| -39% | -$38.7K |
|
|
ALEX
5882
PUT
DELISTED
Alexander & Baldwin
ALEX
| $51K | ﹤0.01% |
2,700
-14,400
| -84% | -$273K |
|
5883
Allot
ALLT
$372M
| $51K | ﹤0.01% |
+19,100
| New | +$61.8K |
|
5884
PUT
Alpha and Omega Semiconductor
AOSL
$950M
| $51K | ﹤0.01% |
1,900
+1,500
| +375% | +$43.6K |
|
|
ARI
5885
PUT
Apollo Commercial Real Estate
ARI
$867M
| $51K | ﹤0.01% |
5,500
+4,100
| +293% | +$45.4K |
|
5886
Astec Industries
ASTE
$1.16B
| $51K | ﹤0.01% |
1,246
-698
| -36% | -$29.5K |
|
|
BCLI
5887
PUT
DELISTED
BRAINSTORM CELL THERAPUTC
BCLI
| $51K | ﹤0.01% |
1,047
+420
| +67% | +$12.2K |
|
5888
Clover Health Investments
CLOV
$2.2B
| $51K | ﹤0.01% |
60,448
+10,553
| +21% | +$11.6K |
|
5889
CVRx
CVRX
$137M
| $51K | ﹤0.01% |
5,573
+5,170
| +1,283% | +$68.4K |
|
5890
CALL
Dana Inc
DAN
$2.9B
| $51K | ﹤0.01% |
3,400
-5,800
| -63% | -$94.9K |
|
5891
PUT
HEICO Corp Class A
HEI.A
$36B
| $51K | ﹤0.01% |
300
-2,600
| -90% | -$345K |
|
5892
PUT
The Honest Company
HNST
$402M
| $51K | ﹤0.01% |
28,400
-300
| -1% | -$819 |
|
|
JFIN
5893
Jiayin Group
JFIN
$113M
| $51K | ﹤0.01% |
+13,921
| New | +$43.4K |
|
5894
CALL
Ligand Pharmaceuticals
LGND
$5.76B
| $51K | ﹤0.01% |
+900
| New | +$64K |
|
5895
Tradr 1.25X NVDA Bear Daily ETF
NVDS
$16M
| $51K | ﹤0.01% |
+43
| New | +$77.6K |
|
5896
CALL
OraSure Technologies
OSUR
$279M
| $51K | ﹤0.01% |
8,500
| – | – |
|
5897
PUT
Park Aerospace
PKE
$737M
| $51K | ﹤0.01% |
3,800
+100
| +3% | +$1.41K |
|
5898
Regenxbio
RGNX
$620M
| $51K | ﹤0.01% |
2,698
+2,151
| +393% | +$47.6K |
|
5899
CALL
Rimini Street
RMNI
$449M
| $51K | ﹤0.01% |
12,500
+10,900
| +681% | +$49.1K |
|
|
SHOE
5900
PUT
Shoe Station Group
SHOE
$413M
| $51K | ﹤0.01% |
2,000
-5,600
| -74% | -$146K |
|
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.