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 | |
|---|---|---|---|---|---|---|
4076
CALL
B2Gold
BTG
$5.12B
| $247K | ﹤0.01% |
62,900
+37,600
| +149% | +$140K |
|
4077
CALL
Entergy
ETR
$52.4B
| $247K | ﹤0.01% |
4,600
-2,000
| -30% | -$106K |
|
4078
CALL
MacroGenics
MGNX
$245M
| $247K | ﹤0.01% |
34,500
+34,200
| +11,400% | +$206K |
|
|
MTLS
4079
Materialise
MTLS
$373M
| $247K | ﹤0.01% |
29,831
+8,659
| +41% | +$77.8K |
|
|
NINE
4080
CALL
DELISTED
Nine Energy Service
NINE
| $247K | ﹤0.01% |
44,600
+19,000
| +74% | +$196K |
|
4081
Invesco Aerospace & Defense ETF
PPA
$8.39B
| $247K | ﹤0.01% |
+3,074
| New | +$245K |
|
|
RNAM
4082
CALL
DELISTED
Avidity Biosciences
RNAM
| $247K | ﹤0.01% |
16,100
+4,700
| +41% | +$103K |
|
4083
CALL
NCR Voyix
VYX
$1.19B
| $247K | ﹤0.01% |
17,115
-139,365
| -89% | -$2.14M |
|
4084
PUT
Ameresco
AMRC
$1.04B
| $246K | ﹤0.01% |
5,000
+4,800
| +2,400% | +$254K |
|
4085
CALL
Arhaus
ARHS
$1.12B
| $246K | ﹤0.01% |
29,700
+28,500
| +2,375% | +$344K |
|
4086
CALL
Carpenter Technology
CRS
$27.8B
| $246K | ﹤0.01% |
5,500
+4,100
| +293% | +$187K |
|
4087
PUT
Clearway Energy Class C
CWEN
$4.9B
| $246K | ﹤0.01% |
7,900
+6,100
| +339% | +$196K |
|
4088
Magnachip Semiconductor
MX
$118M
| $246K | ﹤0.01% |
26,524
-31,779
| -55% | -$315K |
|
4089
PUT
Sturm, Ruger & Co
RGR
$611M
| $246K | ﹤0.01% |
4,300
-16,400
| -79% | -$914K |
|
4090
AeroVironment
AVAV
$7.91B
| $245K | ﹤0.01% |
2,679
+1,349
| +101% | +$119K |
|
|
BDN
4091
CALL
Brandywine Realty Trust
BDN
$521M
| $245K | ﹤0.01% |
51,800
+47,100
| +1,002% | +$276K |
|
4092
Immunovant
IMVT
$7.99B
| $245K | ﹤0.01% |
15,854
+7,362
| +87% | +$128K |
|
4093
PUT
Sprouts Farmers Market
SFM
$7.31B
| $245K | ﹤0.01% |
7,000
-24,600
| -78% | -$796K |
|
4094
TETRA Technologies
TTI
$1.07B
| $245K | ﹤0.01% |
92,484
+19,142
| +26% | +$66.6K |
|
4095
CALL
Vanguard Total International Bond ETF
BNDX
$82.3B
| $244K | ﹤0.01% |
+5,000
| New | +$242K |
|
4096
PUT
Americold
COLD
$4.17B
| $244K | ﹤0.01% |
8,600
+2,700
| +46% | +$80.5K |
|
|
SAND
4097
CALL
DELISTED
Sandstorm Gold
SAND
| $244K | ﹤0.01% |
42,100
-124,600
| -75% | -$682K |
|
4098
PUT
SFL Corp
SFL
$1.61B
| $244K | ﹤0.01% |
25,700
+25,200
| +5,040% | +$249K |
|
|
DAO
4099
Youdao
DAO
$1.93B
| $243K | ﹤0.01% |
28,653
+13,713
| +92% | +$109K |
|
4100
CALL
Emcor
EME
$31.4B
| $243K | ﹤0.01% |
1,500
-3,500
| -70% | -$538K |
|
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.