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 | |
|---|---|---|---|---|---|---|
4601
CALL
USA Compression Partners
USAC
$3.69B
| $158K | ﹤0.01% |
7,500
-2,000
| -21% | -$41.1K |
|
4602
CALL
Veracyte
VCYT
$4.45B
| $158K | ﹤0.01% |
7,100
-14,200
| -67% | -$343K |
|
4603
Vanguard Russell 2000 ETF
VTWO
$17.2B
| $158K | ﹤0.01% |
2,195
+1,969
| +871% | +$146K |
|
4604
Comfort Systems
FIX
$53.5B
| $157K | ﹤0.01% |
1,076
-1,729
| -62% | -$224K |
|
4605
SK Telecom
SKM
$11.4B
| $157K | ﹤0.01% |
7,671
+4,527
| +144% | +$92.6K |
|
|
CCEC
4606
PUT
Capital Clean Energy Carriers
CCEC
$1.37B
| $157K | ﹤0.01% |
11,700
+8,100
| +225% | +$111K |
|
|
MRNS
4607
CALL
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $157K | ﹤0.01% |
22,800
-16,000
| -41% | -$100K |
|
4608
PUT
ACI Worldwide
ACIW
$6.12B
| $156K | ﹤0.01% |
5,800
+400
| +7% | +$10.6K |
|
|
GDEN
4609
CALL
DELISTED
Golden Entertainment
GDEN
| $156K | ﹤0.01% |
3,600
-6,300
| -64% | -$255K |
|
4610
CALL
Immunovant
IMVT
$7.93B
| $156K | ﹤0.01% |
10,100
+5,500
| +120% | +$95.4K |
|
4611
St. Joe Company
JOE
$3.55B
| $156K | ﹤0.01% |
3,756
+3,109
| +481% | +$133K |
|
|
NVMI
4612
PUT
Nova
NVMI
$11.7B
| $156K | ﹤0.01% |
+1,500
| New | +$140K |
|
4613
Arcus Biosciences
RCUS
$3.33B
| $156K | ﹤0.01% |
+8,598
| New | +$164K |
|
4614
CALL
Tenaris
TS
$28.2B
| $156K | ﹤0.01% |
5,500
-6,300
| -53% | -$208K |
|
|
CYB
4615
DELISTED
WisdomTree Chinese Yuan Strategy Fund
CYB
| $156K | ﹤0.01% |
6,158
+3,785
| +160% | +$96.1K |
|
4616
PUT
Customers Bancorp
CUBI
$2.66B
| $155K | ﹤0.01% |
+8,400
| New | +$229K |
|
4617
CALL
Four Corners Property Trust
FCPT
$2.89B
| $155K | ﹤0.01% |
5,800
+5,000
| +625% | +$138K |
|
4618
PUT
FS KKR Capital
FSK
$3.01B
| $155K | ﹤0.01% |
8,400
+1,300
| +18% | +$24.6K |
|
4619
CALL
Matsons
MATX
$6.11B
| $155K | ﹤0.01% |
2,600
-4,900
| -65% | -$316K |
|
4620
Mercury Systems
MRCY
$5.41B
| $155K | ﹤0.01% |
3,038
-505
| -14% | -$25.5K |
|
4621
CALL
Maravai LifeSciences
MRVI
$972M
| $155K | ﹤0.01% |
11,100
+9,700
| +693% | +$139K |
|
4622
CALL
Puma Biotechnology
PBYI
$398M
| $155K | ﹤0.01% |
50,300
-13,800
| -22% | -$52K |
|
4623
PUT
Dorchester Minerals
DMLP
$1.3B
| $154K | ﹤0.01% |
5,100
-2,100
| -29% | -$62.2K |
|
4624
PUT
Evolution Petroleum
EPM
$133M
| $154K | ﹤0.01% |
24,500
+23,900
| +3,983% | +$153K |
|
4625
1-800-Flowers.com
FLWS
$252M
| $154K | ﹤0.01% |
13,468
-41,166
| -75% | -$421K |
|
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.