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 | |
|---|---|---|---|---|---|---|
6126
Alarm.com
ALRM
$2.74B
| $57K | ﹤0.01% |
+791
| New | +$53.7K |
|
|
AUTL
6127
PUT
Autolus Therapeutics
AUTL
$591M
| $57K | ﹤0.01% |
+9,000
| New | +$56.1K |
|
6128
PUT
CarGurus
CARG
$3.38B
| $57K | ﹤0.01% |
2,500
+1,000
| +67% | +$23.1K |
|
6129
PUT
Dorchester Minerals
DMLP
$1.35B
| $57K | ﹤0.01% |
1,700
-1,500
| -47% | -$47.3K |
|
6130
PUT
Equitable Holdings
EQH
$14.4B
| $57K | ﹤0.01% |
1,500
-33,000
| -96% | -$1.12M |
|
6131
Fidelity National Information Services
FIS
$22.8B
| $57K | ﹤0.01% |
772
-83,804
| -99% | -$5.46M |
|
6132
CALL
Gentex
GNTX
$4.99B
| $57K | ﹤0.01% |
1,600
-2,400
| -60% | -$83K |
|
6133
Fusion Fuel Green
HTOO
$17M
| $57K | ﹤0.01% |
970
+357
| +58% | +$17.2K |
|
6134
PUT
Ispire Technology
ISPR
$91.3M
| $57K | ﹤0.01% |
9,300
-9,700
| -51% | -$97.6K |
|
6135
Lincoln Educational Services
LINC
$955M
| $57K | ﹤0.01% |
5,606
+4,931
| +731% | +$48K |
|
6136
Intuitive Machines
LUNR
$2.82B
| $57K | ﹤0.01% |
+9,194
| New | +$43.7K |
|
6137
Mama's Creations
MAMA
$790M
| $57K | ﹤0.01% |
11,486
-1,517
| -12% | -$7.18K |
|
6138
Seres Therapeutics
MCRB
$45M
| $57K | ﹤0.01% |
3,694
+1,428
| +63% | +$30.8K |
|
6139
PUT
Mirum Pharmaceuticals
MIRM
$6.02B
| $57K | ﹤0.01% |
2,300
-15,600
| -87% | -$429K |
|
6140
CALL
OSI Systems
OSIS
$3.77B
| $57K | ﹤0.01% |
400
-29,900
| -99% | -$3.92M |
|
6141
PetMed Express
PETS
$43.4M
| $57K | ﹤0.01% |
12,045
-16,820
| -58% | -$97.8K |
|
|
RDUS
6142
PUT
DELISTED
Radius Recycling
RDUS
| $57K | ﹤0.01% |
2,700
+2,400
| +800% | +$56.5K |
|
|
REVG
6143
CALL
DELISTED
REV Group
REVG
| $57K | ﹤0.01% |
2,600
+1,900
| +271% | +$35.5K |
|
6144
PUT
Ryman Hospitality Properties
RHP
$7.87B
| $57K | ﹤0.01% |
500
-600
| -55% | -$68.9K |
|
|
RVPH
6145
PUT
DELISTED
REVIVA PHARMA HLDGS INC
RVPH
| $57K | ﹤0.01% |
760
-790
| -51% | -$62.6K |
|
6146
CALL
Companhia Siderúrgica Nacional
SID
$1.19B
| $57K | ﹤0.01% |
18,500
-192,000
| -91% | -$664K |
|
|
KNTE
6147
DELISTED
Kinnate Biopharma Inc. Common Stock
KNTE
| $57K | ﹤0.01% |
21,764
-22,575
| -51% | -$55.9K |
|
|
LONA
6148
CALL
LeonaBio Inc
LONA
$73.9M
| $56K | ﹤0.01% |
2,050
+400
| +24% | +$12.7K |
|
6149
PUT
Bright Horizons
BFAM
$3.85B
| $56K | ﹤0.01% |
+500
| New | +$52.7K |
|
6150
Cabot Corp
CBT
$4.45B
| $56K | ﹤0.01% |
+616
| New | +$50.1K |
|
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, 3,674 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.