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 | |
|---|---|---|---|---|---|---|
4251
PUT
Dentsply Sirona
XRAY
$2.7B
| $212K | ﹤0.01% |
5,400
-13,600
| -72% | -$499K |
|
|
PENG
4252
PUT
Penguin Solutions Inc
PENG
$2.47B
| $212K | ﹤0.01% |
12,300
-400
| -3% | -$6.68K |
|
|
CHX
4253
CALL
DELISTED
ChampionX
CHX
| $211K | ﹤0.01% |
7,800
+2,300
| +42% | +$68.7K |
|
4254
CALL
RCI Hospitality Holdings
RICK
$203M
| $211K | ﹤0.01% |
2,700
+1,200
| +80% | +$104K |
|
4255
PUT
Yelp
YELP
$1.51B
| $211K | ﹤0.01% |
6,900
+5,400
| +360% | +$162K |
|
4256
PUT
JFrog
FROG
$9.26B
| $210K | ﹤0.01% |
10,700
-23,900
| -69% | -$532K |
|
4257
CALL
Gentex
GNTX
$5.12B
| $210K | ﹤0.01% |
7,500
+5,000
| +200% | +$141K |
|
4258
CALL
nVent Electric
NVT
$22.9B
| $210K | ﹤0.01% |
4,900
-1,700
| -26% | -$71.7K |
|
|
ESTE
4259
PUT
DELISTED
Earthstone Energy Inc. Class A Common Stock
ESTE
| $210K | ﹤0.01% |
16,200
+1,400
| +9% | +$18.8K |
|
4260
CALL
Butterfly Network
BFLY
$1.88B
| $209K | ﹤0.01% |
111,700
-129,300
| -54% | -$302K |
|
4261
Fortinet
FTNT
$110B
| $209K | ﹤0.01% |
3,150
-18,927
| -86% | -$1.08M |
|
4262
CALL
NiSource
NI
$21.9B
| $209K | ﹤0.01% |
7,500
+6,700
| +838% | +$183K |
|
4263
Phathom Pharmaceuticals
PHAT
$930M
| $209K | ﹤0.01% |
+29,411
| New | +$258K |
|
|
QNTM
4264
CALL
Quantum Biopharma Class B Subordinate Voting Shares
QNTM
$19.2M
| $209K | ﹤0.01% |
2,077
+1,948
| +1,510% | +$167K |
|
4265
AdaptHealth
AHCO
$1.53B
| $208K | ﹤0.01% |
+16,812
| New | +$309K |
|
4266
CALL
American Superconductor
AMSC
$1.39B
| $208K | ﹤0.01% |
42,400
+32,600
| +333% | +$164K |
|
4267
CALL
Black Hills Corp
BKH
$5.69B
| $208K | ﹤0.01% |
3,300
+500
| +18% | +$32.9K |
|
|
BLD
4268
PUT
DELISTED
TopBuild
BLD
| $208K | ﹤0.01% |
1,000
+900
| +900% | +$174K |
|
4269
PUT
Upwork
UPWK
$1.21B
| $208K | ﹤0.01% |
18,400
-600
| -3% | -$7.14K |
|
4270
PUT
Actinium Pharmaceuticals
ATNM
$27.2M
| $207K | ﹤0.01% |
22,000
+1,500
| +7% | +$15.8K |
|
4271
PUT
Brookdale Senior Living
BKD
$3.67B
| $207K | ﹤0.01% |
70,500
+68,600
| +3,611% | +$197K |
|
|
CAN
4272
CALL
Canaan Creative
CAN
$178M
| $207K | ﹤0.01% |
76,800
-572,300
| -88% | -$1.64M |
|
4273
Cerence
CRNC
$368M
| $207K | ﹤0.01% |
+7,403
| New | +$190K |
|
4274
iShares S&P Small-Cap 600 Value ETF
IJS
$8.2B
| $207K | ﹤0.01% |
+2,214
| New | +$216K |
|
4275
Vanguard S&P Mid-Cap 400 Growth ETF
IVOG
$1.63B
| $207K | ﹤0.01% |
2,337
+347
| +17% | +$30.7K |
|
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.