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 | |
|---|---|---|---|---|---|---|
5251
PUT
Legend Biotech
LEGN
$3.69B
| $91K | ﹤0.01% |
1,900
-3,300
| -63% | -$161K |
|
|
NEXN
5252
PUT
Nexxen International
NEXN
$584M
| $91K | ﹤0.01% |
17,400
+5,500
| +46% | +$38.6K |
|
5253
CALL
Smith Micro Software
SMSI
$13.9M
| $91K | ﹤0.01% |
1,978
-920
| -32% | -$82.5K |
|
5254
Viatris
VTRS
$20.7B
| $91K | ﹤0.01% |
9,476
-243,666
| -96% | -$2.7M |
|
|
STER
5255
DELISTED
Sterling Check Corp. Common Stock
STER
| $91K | ﹤0.01% |
8,208
-1,532
| -16% | -$20.2K |
|
5256
CALL
Alto Ingredients
ALTO
$358M
| $90K | ﹤0.01% |
60,600
-135,500
| -69% | -$371K |
|
5257
CALL
Aqua Metals
AQMS
$10.2M
| $90K | ﹤0.01% |
451
-31
| -6% | -$7.24K |
|
|
OPTU
5258
PUT
Optimum Communications Inc
OPTU
$290M
| $90K | ﹤0.01% |
26,600
-70,900
| -73% | -$301K |
|
5259
ProShares Short Bitcoin Strategy ETF
BITI
$103M
| $90K | ﹤0.01% |
+870
| New | +$122K |
|
5260
CALL
Bentley Systems
BSY
$10.7B
| $90K | ﹤0.01% |
2,100
+1,800
| +600% | +$71.6K |
|
5261
Coherus Oncology
CHRS
$227M
| $90K | ﹤0.01% |
13,275
-24,140
| -65% | -$187K |
|
5262
PUT
Clearwater Paper
CLW
$341M
| $90K | ﹤0.01% |
+2,700
| New | +$97.5K |
|
5263
CALL
Delek Logistics
DKL
$3.14B
| $90K | ﹤0.01% |
1,900
-2,300
| -55% | -$112K |
|
5264
CALL
Kinsale Capital Group
KNSL
$8.11B
| $90K | ﹤0.01% |
300
-2,300
| -88% | -$673K |
|
5265
PUT
OR Royalties Inc
OR
$5.75B
| $90K | ﹤0.01% |
5,700
-2,300
| -29% | -$31K |
|
5266
PUT
PROG Holdings
PRG
$1.71B
| $90K | ﹤0.01% |
3,800
-7,000
| -65% | -$157K |
|
5267
CALL
Steven Madden
SHOO
$3.5B
| $90K | ﹤0.01% |
2,500
-2,400
| -49% | -$83.2K |
|
5268
CALL
UDR
UDR
$12.3B
| $90K | ﹤0.01% |
2,200
-8,400
| -79% | -$347K |
|
5269
CALL
Vital Farms
VITL
$536M
| $90K | ﹤0.01% |
5,900
+3,500
| +146% | +$55.4K |
|
5270
CALL
Washington Trust Bancorp
WASH
$748M
| $90K | ﹤0.01% |
2,600
+2,500
| +2,500% | +$105K |
|
5271
CALL
Avery Dennison
AVY
$13.4B
| $89K | ﹤0.01% |
500
-2,700
| -84% | -$490K |
|
|
5272
PUT
Avery Dennison
AVY
$13.4B
| $89K | ﹤0.01% |
500
-1,900
| -79% | -$345K |
|
5273
Clean Harbors
CLH
$16.7B
| $89K | ﹤0.01% |
+627
| New | +$81.6K |
|
5274
Community Health Systems
CYH
$391M
| $89K | ﹤0.01% |
18,262
-156,546
| -90% | -$824K |
|
5275
PUT
Genius Sports
GENI
$1.87B
| $89K | ﹤0.01% |
18,000
+2,800
| +18% | +$13.1K |
|
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.