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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3351
CALL
ADMA Biologics
ADMA
$1.98B
| $804K | ﹤0.01% |
121,900
+88,800
| +268% | +$485K |
|
3352
Charles River Laboratories
CRL
$11.4B
| $804K | ﹤0.01% |
2,970
+808
| +37% | +$193K |
|
3353
Masco
MAS
$16.7B
| $804K | ﹤0.01% |
10,195
-8,559
| -46% | -$617K |
|
3354
ARK Innovation ETF
ARKK
$5.58B
| $803K | ﹤0.01% |
16,045
-544,410
| -97% | -$26.6M |
|
3355
PUT
Levi Strauss
LEVI
$9.67B
| $803K | ﹤0.01% |
40,200
-17,400
| -30% | -$302K |
|
3356
CALL
Utz Brands
UTZ
$1.25B
| $803K | ﹤0.01% |
43,600
+14,500
| +50% | +$258K |
|
3357
PUT
Installed Building Products
IBP
$6.33B
| $802K | ﹤0.01% |
3,100
+700
| +29% | +$150K |
|
|
CVSA
3358
CALL
Covista Inc
CVSA
$4.17B
| $801K | ﹤0.01% |
15,600
+6,900
| +79% | +$360K |
|
|
ALPN
3359
PUT
DELISTED
Alpine Immune Sciences Inc
ALPN
| $800K | ﹤0.01% |
+20,200
| New | +$596K |
|
3360
PUT
Marqeta
MQ
$1.9B
| $798K | ﹤0.01% |
33,475
-4,800
| -13% | -$119K |
|
3361
PUT
BlackLine
BL
$1.87B
| $794K | ﹤0.01% |
12,300
-9,700
| -44% | -$589K |
|
3362
Ares Management
ARES
$28.9B
| $793K | ﹤0.01% |
5,965
-766
| -11% | -$97.8K |
|
3363
CALL
Robert Half
RHI
$4.18B
| $792K | ﹤0.01% |
10,000
+7,900
| +376% | +$637K |
|
3364
Dynatrace
DT
$12.7B
| $791K | ﹤0.01% |
17,033
+6,072
| +55% | +$316K |
|
3365
Invesco
IVZ
$13.1B
| $791K | ﹤0.01% |
47,718
+38,678
| +428% | +$624K |
|
3366
PUT
Extreme Networks
EXTR
$3.75B
| $790K | ﹤0.01% |
68,500
+45,700
| +200% | +$623K |
|
3367
PUT
Vermilion Energy
VET
$1.62B
| $789K | ﹤0.01% |
63,500
+12,800
| +25% | +$143K |
|
3368
PUT
MoonLake Immunotherapeutics
MLTX
$1.64B
| $788K | ﹤0.01% |
15,700
-53,500
| -77% | -$2.9M |
|
3369
PUT
Shutterstock
SSTK
$222M
| $787K | ﹤0.01% |
17,200
-11,200
| -39% | -$534K |
|
3370
CALL
Black Stone Minerals
BSM
$3.18B
| $786K | ﹤0.01% |
49,200
-13,500
| -22% | -$214K |
|
3371
PUT
Leidos
LDOS
$14.8B
| $786K | ﹤0.01% |
6,000
-3,800
| -39% | -$453K |
|
3372
RH
RH
$3.43B
| $786K | ﹤0.01% |
+2,259
| New | +$616K |
|
3373
CALL
Editas Medicine
EDIT
$390M
| $785K | ﹤0.01% |
105,900
-154,800
| -59% | -$1.29M |
|
|
EQC
3374
PUT
DELISTED
Equity Commonwealth
EQC
| $785K | ﹤0.01% |
41,600
+39,700
| +2,089% | +$754K |
|
3375
PUT
Atlas Energy Solutions
AESI
$1.35B
| $784K | ﹤0.01% |
34,700
+22,300
| +180% | +$416K |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.