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 | |
|---|---|---|---|---|---|---|
5676
PUT
inTEST
INTT
$155M
| $62K | ﹤0.01% |
3,000
+1,000
| +50% | +$15K |
|
|
KG
5677
Kestrel Group
KG
$69.4M
| $62K | ﹤0.01% |
+1,501
| New | +$69.6K |
|
|
MLNK
5678
PUT
DELISTED
MeridianLink
MLNK
| $62K | ﹤0.01% |
+3,600
| New | +$57.9K |
|
5679
CALL
Magnachip Semiconductor
MX
$119M
| $62K | ﹤0.01% |
6,700
-60,900
| -90% | -$603K |
|
|
NINE
5680
PUT
DELISTED
Nine Energy Service
NINE
| $62K | ﹤0.01% |
11,300
+10,000
| +769% | +$103K |
|
|
SLI
5681
PUT
Standard Lithium
SLI
$502M
| $62K | ﹤0.01% |
16,500
-2,600
| -14% | -$10.1K |
|
5682
Semtech
SMTC
$11B
| $62K | ﹤0.01% |
+2,591
| New | +$81K |
|
5683
CALL
StoneX
SNEX
$9.26B
| $62K | ﹤0.01% |
3,038
| – | – |
|
5684
Trustmark
TRMK
$2.76B
| $62K | ﹤0.01% |
+2,518
| New | +$74.4K |
|
5685
CALL
Urban One Class D
UONEK
$22.8M
| $62K | ﹤0.01% |
+830
| New | +$41.2K |
|
|
FAZE
5686
DELISTED
FaZe Holdings Inc. Common Stock
FAZE
| $62K | ﹤0.01% |
136,659
+123,572
| +944% | +$106K |
|
|
CTIC
5687
DELISTED
CTI BioPharma Corp. (DE) Common Stock
CTIC
| $62K | ﹤0.01% |
14,801
-7,688
| -34% | -$39.9K |
|
5688
PUT
Ameriprise Financial
AMP
$48.3B
| $61K | ﹤0.01% |
200
-200
| -50% | -$65.5K |
|
5689
PUT
BioCardia
BCDA
$12.3M
| $61K | ﹤0.01% |
2,100
+300
| +17% | +$9.96K |
|
|
CRESY
5690
PUT
Cresud
CRESY
$795M
| $61K | ﹤0.01% |
10,096
+6,973
| +223% | +$45.7K |
|
5691
Carlisle Companies
CSL
$14.3B
| $61K | ﹤0.01% |
274
-1,600
| -85% | -$389K |
|
5692
CALL
Healthcare Services Group
HCSG
$1.6B
| $61K | ﹤0.01% |
4,400
+3,300
| +300% | +$43.4K |
|
5693
Paylocity
PCTY
$7.38B
| $61K | ﹤0.01% |
310
-7,899
| -96% | -$1.55M |
|
5694
Talos Energy
TALO
$2.53B
| $61K | ﹤0.01% |
4,160
-2,749
| -40% | -$47.3K |
|
5695
Watts Water Technologies
WTS
$11.5B
| $61K | ﹤0.01% |
+363
| New | +$59.8K |
|
|
UCB
5696
CALL
United Community Banks
UCB
$4.24B
| $61K | ﹤0.01% |
+2,200
| New | +$69.5K |
|
|
AXNX
5697
DELISTED
Axonics, Inc. Common Stock
AXNX
| $61K | ﹤0.01% |
+1,133
| New | +$66.2K |
|
5698
PUT
Arbutus Biopharma
ABUS
$857M
| $60K | ﹤0.01% |
20,000
-11,400
| -36% | -$32.2K |
|
|
AMRN
5699
Amarin Corp
AMRN
$298M
| $60K | ﹤0.01% |
2,022
+1,533
| +313% | +$53.8K |
|
5700
PUT
Digimarc Corp
DMRC
$147M
| $60K | ﹤0.01% |
3,100
+2,100
| +210% | +$42.4K |
|
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.