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 | |
|---|---|---|---|---|---|---|
5001
PUT
Meritage Homes
MTH
$4.58B
| $175K | ﹤0.01% |
2,000
-71,800
| -97% | -$5.81M |
|
5002
CALL
NCR Voyix
VYX
$1.14B
| $175K | ﹤0.01% |
16,800
-5,300
| -24% | -$76.3K |
|
|
DO
5003
PUT
DELISTED
Diamond Offshore Drilling, Inc.
DO
| $175K | ﹤0.01% |
12,900
+2,100
| +19% | +$25.9K |
|
5004
PUT
AXT Inc
AXTI
$3.95B
| $174K | ﹤0.01% |
+38,100
| New | +$129K |
|
5005
Endava
DAVA
$158M
| $174K | ﹤0.01% |
4,596
+2,623
| +133% | +$158K |
|
5006
CALL
Harrow
HROW
$1.45B
| $174K | ﹤0.01% |
13,200
-84,400
| -86% | -$900K |
|
|
SQSP
5007
PUT
DELISTED
Squarespace, Inc.
SQSP
| $174K | ﹤0.01% |
4,800
+800
| +20% | +$26K |
|
5008
CALL
AtaiBeckley Inc
ATAI
$2.66B
| $173K | ﹤0.01% |
88,000
+82,800
| +1,592% | +$152K |
|
5009
CALL
Conduent
CNDT
$244M
| $173K | ﹤0.01% |
51,400
-30,800
| -37% | -$107K |
|
|
ORLA
5010
Orla Mining
ORLA
$3.54B
| $173K | ﹤0.01% |
45,697
+24,783
| +118% | +$85.4K |
|
5011
PennantPark Floating Rate Capital
PFLT
$689M
| $173K | ﹤0.01% |
15,264
+13,255
| +660% | +$153K |
|
5012
Valmont Industries
VMI
$9.3B
| $173K | ﹤0.01% |
+758
| New | +$170K |
|
5013
State Street SPDR S&P Health Care Equipment ETF
XHE
$161M
| $173K | ﹤0.01% |
1,972
+1,645
| +503% | +$140K |
|
5014
Bright Horizons
BFAM
$3.92B
| $172K | ﹤0.01% |
+1,526
| New | +$161K |
|
5015
WisdomTree Emerging Markets High Dividend Fund
DEM
$3.9B
| $172K | ﹤0.01% |
4,125
+253
| +7% | +$10.3K |
|
5016
GATX Corp
GATX
$6.35B
| $172K | ﹤0.01% |
1,285
+80
| +7% | +$10.1K |
|
5017
CALL
InvenTrust Properties
IVT
$2.76B
| $172K | ﹤0.01% |
6,700
+4,300
| +179% | +$108K |
|
5018
MacroGenics
MGNX
$235M
| $172K | ﹤0.01% |
11,720
+10,804
| +1,179% | +$163K |
|
5019
CALL
Abeona Therapeutics
ABEO
$366M
| $171K | ﹤0.01% |
23,700
+15,400
| +186% | +$97.6K |
|
5020
Capricor Therapeutics
CAPR
$223M
| $171K | ﹤0.01% |
25,197
-17,543
| -41% | -$84.8K |
|
5021
PUT
Donaldson
DCI
$10.9B
| $171K | ﹤0.01% |
2,300
+100
| +5% | +$6.8K |
|
5022
PUT
Amdocs
DOX
$5.92B
| $171K | ﹤0.01% |
1,900
-300
| -14% | -$27.3K |
|
5023
PUT
LoveSac
LOVE
$236M
| $171K | ﹤0.01% |
7,600
+1,900
| +33% | +$44.3K |
|
5024
CALL
Quanterix
QTRX
$164M
| $171K | ﹤0.01% |
7,300
+6,900
| +1,725% | +$171K |
|
5025
PUT
Rigetti Computing
RGTI
$4.97B
| $171K | ﹤0.01% |
112,400
+93,800
| +504% | +$135K |
|
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.