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 | |
|---|---|---|---|---|---|---|
|
RDFN
4501
DELISTED
Redfin
RDFN
| $274K | ﹤0.01% |
+41,220
| New | +$313K |
|
4502
PUT
SharkNinja
SN
$22.5B
| $274K | ﹤0.01% |
4,400
+4,300
| +4,300% | +$227K |
|
|
SBDS
4503
PUT
DELISTED
Solo Brands Inc
SBDS
| $274K | ﹤0.01% |
3,158
+248
| +9% | +$28.5K |
|
4504
Kadant
KAI
$3.58B
| $273K | ﹤0.01% |
833
+711
| +583% | +$214K |
|
|
SLNO
4505
CALL
DELISTED
Soleno Therapeutics
SLNO
| $273K | ﹤0.01% |
6,400
+5,300
| +482% | +$240K |
|
4506
CALL
Trinity Capital Inc.
TRIN
$1.58B
| $273K | ﹤0.01% |
18,600
+7,100
| +62% | +$102K |
|
|
JOYY
4507
CALL
JOYY Inc
JOYY
$3.73B
| $273K | ﹤0.01% |
8,900
+3,600
| +68% | +$114K |
|
4508
PUT
BioCryst Pharmaceuticals
BCRX
$2.42B
| $272K | ﹤0.01% |
53,700
+42,900
| +397% | +$241K |
|
|
GDEN
4509
CALL
DELISTED
Golden Entertainment
GDEN
| $272K | ﹤0.01% |
7,400
+7,100
| +2,367% | +$263K |
|
4510
PUT
Lazard
LAZ
$3.96B
| $272K | ﹤0.01% |
6,500
+2,500
| +63% | +$97.4K |
|
4511
Toyota
TM
$228B
| $272K | ﹤0.01% |
1,081
-28,301
| -96% | -$6.26M |
|
4512
CALL
U-Haul Holding Co Series N
UHAL.B
$12.4B
| $272K | ﹤0.01% |
4,100
-24,200
| -86% | -$1.56M |
|
|
CIM
4513
PUT
Chimera Investment
CIM
$1.06B
| $271K | ﹤0.01% |
19,600
+12,533
| +177% | +$175K |
|
4514
CALL
Cheniere Energy
CQP
$30.5B
| $271K | ﹤0.01% |
5,500
+1,800
| +49% | +$91.3K |
|
4515
CryoPort
CYRX
$753M
| $271K | ﹤0.01% |
+15,362
| New | +$243K |
|
|
CBIO
4516
Crescent Biopharma
CBIO
$546M
| $271K | ﹤0.01% |
907
+183
| +25% | +$54.7K |
|
4517
PUT
Mine Safety
MSA
$6.79B
| $271K | ﹤0.01% |
1,400
-500
| -26% | -$87.9K |
|
4518
Palomar
PLMR
$3.79B
| $271K | ﹤0.01% |
3,238
+2,519
| +350% | +$173K |
|
4519
CALL
Pulse Biosciences
PLSE
$2.37B
| $271K | ﹤0.01% |
31,200
+2,700
| +9% | +$24.8K |
|
|
LAR
4520
Lithium Argentina AG
LAR
$906M
| $271K | ﹤0.01% |
+50,355
| New | +$244K |
|
4521
CALL
Ameresco
AMRC
$980M
| $270K | ﹤0.01% |
11,200
+9,100
| +433% | +$204K |
|
4522
PUT
Bioventus
BVS
$889M
| $270K | ﹤0.01% |
52,100
+43,200
| +485% | +$211K |
|
4523
Intuit
INTU
$91.1B
| $270K | ﹤0.01% |
+416
| New | +$266K |
|
4524
PUT
Pitney Bowes
PBI
$2.39B
| $270K | ﹤0.01% |
62,400
-17,000
| -21% | -$70.1K |
|
|
SCS
4525
PUT
DELISTED
Steelcase
SCS
| $270K | ﹤0.01% |
20,700
+9,900
| +92% | +$127K |
|
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.