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 | |
|---|---|---|---|---|---|---|
1326
Viking Therapeutics
VKTX
$4.02B
| $4.82M | ﹤0.01% |
289,240
-108,853
| -27% | -$1.12M |
|
1327
CALL
Wabtec
WAB
$50.5B
| $4.8M | ﹤0.01% |
47,500
+11,700
| +33% | +$1.19M |
|
1328
CALL
BioMarin Pharmaceuticals
BMRN
$11.4B
| $4.78M | ﹤0.01% |
49,200
-27,600
| -36% | -$2.86M |
|
|
1329
PUT
BioMarin Pharmaceuticals
BMRN
$11.4B
| $4.78M | ﹤0.01% |
49,200
-26,300
| -35% | -$2.73M |
|
1330
PUT
International Flavors & Fragrances
IFF
$19.2B
| $4.78M | ﹤0.01% |
52,000
+44,200
| +567% | +$4.39M |
|
1331
CALL
ProShares Ultra S&P500
SSO
$7.86B
| $4.76M | ﹤0.01% |
196,600
-229,600
| -54% | -$5.5M |
|
|
FLNA
1332
CALL
Filana Therapeutics
FLNA
$43.5M
| $4.75M | ﹤0.01% |
197,000
-308,700
| -61% | -$8.55M |
|
1333
CALL
ZTO Express
ZTO
$18.3B
| $4.75M | ﹤0.01% |
165,800
+23,800
| +17% | +$650K |
|
1334
CALL
Agilon Health
AGL
$1.68B
| $4.75M | ﹤0.01% |
8,000
+4,004
| +100% | +$2.24M |
|
1335
PUT
Trump Media & Technology Group
DJT
$2.44B
| $4.73M | ﹤0.01% |
336,900
-415,800
| -55% | -$6.17M |
|
1336
PUT
Vodafone
VOD
$35B
| $4.72M | ﹤0.01% |
427,300
+35,200
| +9% | +$401K |
|
|
FL
1337
PUT
DELISTED
Foot Locker
FL
| $4.71M | ﹤0.01% |
118,800
-99,200
| -46% | -$4.15M |
|
1338
CALL
Ambarella
AMBA
$2.99B
| $4.7M | ﹤0.01% |
60,700
-179,200
| -75% | -$15.3M |
|
1339
PUT
Clorox
CLX
$11.5B
| $4.7M | ﹤0.01% |
29,700
-66,900
| -69% | -$10M |
|
1340
CALL
QuidelOrtho
QDEL
$1.1B
| $4.7M | ﹤0.01% |
52,700
-18,900
| -26% | -$1.64M |
|
1341
PUT
QuantumScape Corp
QS
$3.02B
| $4.69M | ﹤0.01% |
573,900
+299,400
| +109% | +$2.43M |
|
1342
PUT
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $4.67M | ﹤0.01% |
10,200
-38,200
| -79% | -$17.8M |
|
1343
CALL
TechnipFMC
FTI
$30.7B
| $4.66M | ﹤0.01% |
341,100
+311,600
| +1,056% | +$4.22M |
|
|
WCC
1344
CALL
WESCO International
WCC
$16B
| $4.65M | ﹤0.01% |
30,100
+12,800
| +74% | +$1.92M |
|
1345
CALL
Keysight
KEYS
$54.6B
| $4.63M | ﹤0.01% |
28,700
-26,000
| -48% | -$4.41M |
|
1346
State Street SPDR S&P Retail ETF
XRT
$364M
| $4.63M | ﹤0.01% |
+73,045
| New | +$4.8M |
|
|
GAP
1347
PUT
The Gap Inc
GAP
$6.83B
| $4.63M | ﹤0.01% |
461,000
-350,400
| -43% | -$4.27M |
|
1348
PUT
Enbridge
ENB
$124B
| $4.62M | ﹤0.01% |
121,200
-143,300
| -54% | -$5.62M |
|
1349
PUT
Moody's
MCO
$82.3B
| $4.62M | ﹤0.01% |
15,100
-39,700
| -72% | -$12M |
|
1350
Baxter International
BAX
$11.5B
| $4.62M | ﹤0.01% |
113,842
+109,643
| +2,611% | +$4.65M |
|
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.