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 | |
|---|---|---|---|---|---|---|
4451
PUT
Pilgrim's Pride
PPC
$7.13B
| $180K | ﹤0.01% |
7,800
-9,000
| -54% | -$218K |
|
4452
PUT
Avita Medical
RCEL
$137M
| $180K | ﹤0.01% |
+12,900
| New | +$137K |
|
4453
CALL
Energy Fuels
UUUU
$2.68B
| $180K | ﹤0.01% |
32,400
-111,900
| -78% | -$725K |
|
4454
CALL
Vishay Intertechnology
VSH
$4.6B
| $180K | ﹤0.01% |
8,000
+700
| +10% | +$15.4K |
|
|
CIR
4455
CALL
DELISTED
CIRCOR International, Inc
CIR
| $180K | ﹤0.01% |
5,800
-3,300
| -36% | -$90.2K |
|
4456
PUT
Credo Technology Group
CRDO
$33.1B
| $179K | ﹤0.01% |
19,100
+11,600
| +155% | +$146K |
|
4457
State Street SPDR S&P China ETF
GXC
$456M
| $179K | ﹤0.01% |
2,176
-2,294
| -51% | -$192K |
|
4458
PUT
Navient
NAVI
$819M
| $179K | ﹤0.01% |
11,200
+2,000
| +22% | +$34.9K |
|
4459
PUT
Ocular Therapeutix
OCUL
$1.83B
| $179K | ﹤0.01% |
34,100
+12,700
| +59% | +$60.3K |
|
|
RENT
4460
PUT
Rent the Runway
RENT
$124M
| $179K | ﹤0.01% |
3,155
-595
| -16% | -$41.6K |
|
|
PDCO
4461
PUT
DELISTED
Patterson Companies, Inc.
PDCO
| $179K | ﹤0.01% |
6,700
+3,100
| +86% | +$87.2K |
|
4462
PUT
Brookfield Infrastructure Partners
BIP
$19.6B
| $178K | ﹤0.01% |
5,300
+4,600
| +657% | +$155K |
|
4463
PUT
Ethan Allen Interiors
ETD
$600M
| $178K | ﹤0.01% |
6,500
-10,000
| -61% | -$284K |
|
4464
CALL
EXL Service
EXLS
$5.5B
| $178K | ﹤0.01% |
5,500
+4,000
| +267% | +$133K |
|
|
4465
PUT
EXL Service
EXLS
$5.5B
| $178K | ﹤0.01% |
5,500
-41,000
| -88% | -$1.36M |
|
4466
PUT
SLM Corp
SLM
$4.83B
| $178K | ﹤0.01% |
14,400
+13,500
| +1,500% | +$199K |
|
|
SOHU
4467
CALL
Sohu.com
SOHU
$352M
| $178K | ﹤0.01% |
12,100
+7,000
| +137% | +$105K |
|
|
AMWD
4468
PUT
DELISTED
American Woodmark
AMWD
| $177K | ﹤0.01% |
3,400
-700
| -17% | -$37.9K |
|
4469
PUT
J&J Snack Foods
JJSF
$1.49B
| $177K | ﹤0.01% |
1,200
+800
| +200% | +$116K |
|
4470
CALL
Leslie's
LESL
$8.33M
| $177K | ﹤0.01% |
805
-590
| -42% | -$153K |
|
|
CNH
4471
PUT
CNH Industrial
CNH
$13.3B
| $177K | ﹤0.01% |
11,600
-200
| -2% | -$3.24K |
|
4472
State Street SPDR Bloomberg 1-3 Month T-Bill ETF
BIL
$47.1B
| $176K | ﹤0.01% |
1,917
-2,903
| -60% | -$266K |
|
4473
Cooper-Standard Automotive
CPS
$517M
| $176K | ﹤0.01% |
12,429
-10,468
| -46% | -$153K |
|
|
RAPT
4474
PUT
DELISTED
RAPT Therapeutics
RAPT
| $176K | ﹤0.01% |
+1,200
| New | +$243K |
|
4475
PUT
Warby Parker
WRBY
$3.19B
| $176K | ﹤0.01% |
16,700
-64,800
| -80% | -$888K |
|
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.