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 | |
|---|---|---|---|---|---|---|
4476
PUT
Global X S&P 500 Tail Risk ETF
XTR
$4.71M
| $176K | ﹤0.01% |
8,000
+5,600
| +233% | +$131K |
|
|
DCBO
4477
CALL
Docebo
DCBO
$559M
| $175K | ﹤0.01% |
4,300
+3,600
| +514% | +$132K |
|
4478
ProShares UltraShort Dow 30
DXD
$43.6M
| $175K | ﹤0.01% |
4,094
+2,473
| +153% | +$107K |
|
4479
PUT
Genco Shipping & Trading
GNK
$1.1B
| $175K | ﹤0.01% |
11,200
+3,600
| +47% | +$61.6K |
|
4480
CALL
Allegiant Air
ALGT
$2.57B
| $174K | ﹤0.01% |
1,900
+100
| +6% | +$8.99K |
|
4481
Gray Television
GTN
$437M
| $174K | ﹤0.01% |
19,988
-85,557
| -81% | -$954K |
|
4482
CALL
Oaktree Specialty Lending
OCSL
$1.05B
| $174K | ﹤0.01% |
9,300
+7,767
| +507% | +$155K |
|
4483
Selective Insurance
SIGI
$5.76B
| $174K | ﹤0.01% |
1,828
-90
| -5% | -$8.61K |
|
|
DCH
4484
Dauch Corp
DCH
$1.31B
| $173K | ﹤0.01% |
22,181
-31,890
| -59% | -$274K |
|
4485
CALL
Haemonetics
HAE
$3.88B
| $173K | ﹤0.01% |
2,100
-900
| -30% | -$72.9K |
|
4486
CALL
IDT Corp
IDT
$1.67B
| $173K | ﹤0.01% |
5,100
+4,400
| +629% | +$135K |
|
4487
PUT
Lightwave Logic
LWLG
$823M
| $173K | ﹤0.01% |
33,100
-8,000
| -19% | -$44.6K |
|
4488
CALL
Lloyds Banking Group
LYG
$85.2B
| $173K | ﹤0.01% |
74,800
-8,700
| -10% | -$21.1K |
|
|
PSTL
4489
PUT
Postal Realty Trust
PSTL
$703M
| $173K | ﹤0.01% |
11,400
+11,100
| +3,700% | +$166K |
|
4490
CALL
Standard Motor Products
SMP
$902M
| $173K | ﹤0.01% |
4,700
+3,400
| +262% | +$129K |
|
4491
CALL
Liquidia Corp
LQDA
$7.72B
| $172K | ﹤0.01% |
25,000
-190,000
| -88% | -$1.3M |
|
|
RENT
4492
Rent the Runway
RENT
$124M
| $172K | ﹤0.01% |
3,032
-3,482
| -53% | -$243K |
|
4493
CALL
Rayonier
RYN
$6.67B
| $172K | ﹤0.01% |
5,732
-2,094
| -27% | -$64.6K |
|
4494
PUT
Uranium Energy
UEC
$4.47B
| $172K | ﹤0.01% |
59,800
-30,000
| -33% | -$109K |
|
|
SILV
4495
CALL
DELISTED
SilverCrest Metals Inc. Common Shares
SILV
| $172K | ﹤0.01% |
24,100
+10,200
| +73% | +$62.4K |
|
|
NSTG
4496
PUT
DELISTED
NanoString Technologies, Inc.
NSTG
| $172K | ﹤0.01% |
17,400
-132,200
| -88% | -$1.31M |
|
|
EMBK
4497
CALL
DELISTED
Embark Technology, Inc. Common Stock
EMBK
| $172K | ﹤0.01% |
61,500
-92,700
| -60% | -$341K |
|
4498
CALL
Agree Realty
ADC
$9.66B
| $171K | ﹤0.01% |
2,500
+600
| +32% | +$42.8K |
|
4499
CALL
AquaBounty Technologies
AQB
$4.73M
| $171K | ﹤0.01% |
14,380
-830
| -5% | -$13.4K |
|
4500
CALL
BRC Inc
BRCC
$122M
| $171K | ﹤0.01% |
33,400
-8,900
| -21% | -$55.9K |
|
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.