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 | |
|---|---|---|---|---|---|---|
4726
Hexcel
HXL
$7.76B
| $222K | ﹤0.01% |
3,053
-210
| -6% | -$15.1K |
|
4727
PUT
Insight Enterprises
NSIT
$3.86B
| $222K | ﹤0.01% |
1,200
+900
| +300% | +$166K |
|
4728
PUT
Telus
TU
$16.8B
| $222K | ﹤0.01% |
13,900
+10,800
| +348% | +$189K |
|
|
AD
4729
PUT
Array Digital Infrastructure
AD
$3.02B
| $222K | ﹤0.01% |
6,100
-4,600
| -43% | -$180K |
|
4730
Aviat Networks
AVNW
$271M
| $221K | ﹤0.01% |
+5,767
| New | +$193K |
|
4731
CALL
Carlyle Secured Lending
CGBD
$702M
| $221K | ﹤0.01% |
13,600
-5,500
| -29% | -$86.2K |
|
4732
PUT
Dorman Products
DORM
$3.98B
| $221K | ﹤0.01% |
2,300
+300
| +15% | +$25.8K |
|
4733
PUT
Global Partners
GLP
$1.66B
| $221K | ﹤0.01% |
5,000
+3,600
| +257% | +$164K |
|
4734
CALL
Stem
STEM
$47.5M
| $221K | ﹤0.01% |
5,050
-22,000
| -81% | -$1.22M |
|
4735
AppFolio
APPF
$6.23B
| $220K | ﹤0.01% |
893
+24
| +3% | +$5.17K |
|
4736
CALL
Brookfield Renewable
BEP
$9.9B
| $220K | ﹤0.01% |
9,500
+300
| +3% | +$7.29K |
|
4737
Penumbra
PEN
$12.6B
| $220K | ﹤0.01% |
989
-7,322
| -88% | -$1.81M |
|
4738
ProShares Ultra Bloomberg Crude Oil
UCO
$416M
| $220K | ﹤0.01% |
6,685
-2,852
| -30% | -$83K |
|
|
TUP
4739
CALL
DELISTED
Tupperware Brands Corporation
TUP
| $220K | ﹤0.01% |
164,600
-165,900
| -50% | -$265K |
|
|
ADVM
4740
CALL
DELISTED
Adverum Biotechnologies
ADVM
| $219K | ﹤0.01% |
15,500
+15,290
| +7,281% | +$233K |
|
|
VISN
4741
Vistance Networks Inc
VISN
$2.64B
| $219K | ﹤0.01% |
167,912
-44,100
| -21% | -$86.9K |
|
4742
PUT
Limbach Holdings
LMB
$833M
| $219K | ﹤0.01% |
+5,300
| New | +$230K |
|
4743
Tenable Holdings
TENB
$3.59B
| $219K | ﹤0.01% |
+4,432
| New | +$210K |
|
4744
PUT
Woodside Energy
WDS
$44.4B
| $219K | ﹤0.01% |
11,000
-12,300
| -53% | -$249K |
|
4745
Blue Bird Corp
BLBD
$2.36B
| $218K | ﹤0.01% |
5,690
+4,230
| +290% | +$130K |
|
4746
EverQuote
EVER
$886M
| $218K | ﹤0.01% |
11,776
+8,860
| +304% | +$130K |
|
4747
PUT
Gladstone Capital
GLAD
$426M
| $218K | ﹤0.01% |
10,200
+9,600
| +1,600% | +$202K |
|
4748
CALL
OneSpan
OSPN
$571M
| $218K | ﹤0.01% |
+18,800
| New | +$193K |
|
4749
CALL
Sabesp
SBS
$19.2B
| $218K | ﹤0.01% |
67,035
+61,878
| +1,200% | +$189K |
|
4750
PUT
Spire Global
SPIR
$440M
| $218K | ﹤0.01% |
18,200
-2,200
| -11% | -$21.8K |
|
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.