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 | |
|---|---|---|---|---|---|---|
3551
CALL
Community Health Systems
CYH
$393M
| $666K | ﹤0.01% |
190,500
+162,700
| +585% | +$550K |
|
3552
Progress Software
PRGS
$1.66B
| $666K | ﹤0.01% |
12,498
+8,937
| +251% | +$491K |
|
3553
CALL
Endava
DAVA
$153M
| $665K | ﹤0.01% |
17,500
+9,000
| +106% | +$541K |
|
3554
CALL
Carpenter Technology
CRS
$27.8B
| $664K | ﹤0.01% |
9,300
-23,900
| -72% | -$1.56M |
|
3555
Owens Corning
OC
$11.5B
| $664K | ﹤0.01% |
+3,982
| New | +$607K |
|
3556
CALL
Leggett & Platt
LEG
$1.47B
| $662K | ﹤0.01% |
34,600
-3,300
| -9% | -$71.7K |
|
|
PLL
3557
PUT
DELISTED
Piedmont Lithium
PLL
| $662K | ﹤0.01% |
49,700
+43,100
| +653% | +$692K |
|
|
SAND
3558
CALL
DELISTED
Sandstorm Gold
SAND
| $662K | ﹤0.01% |
126,100
+27,900
| +28% | +$129K |
|
|
MCW
3559
CALL
DELISTED
Mister Car Wash
MCW
| $661K | ﹤0.01% |
85,300
-22,800
| -21% | -$188K |
|
3560
Applied Optoelectronics
AAOI
$7.07B
| $660K | ﹤0.01% |
+47,674
| New | +$803K |
|
3561
CALL
CenterPoint Energy
CNP
$28.8B
| $658K | ﹤0.01% |
23,100
-17,000
| -42% | -$476K |
|
|
GRFS
3562
PUT
Grifois
GRFS
$5.44B
| $656K | ﹤0.01% |
98,300
+95,900
| +3,996% | +$749K |
|
3563
CALL
ODDITY Tech
ODD
$784M
| $656K | ﹤0.01% |
15,100
-14,700
| -49% | -$634K |
|
3564
CALL
Sundial Growers
SNDL
$318M
| $656K | ﹤0.01% |
327,400
-433,600
| -57% | -$633K |
|
3565
PUT
Trimble
TRMB
$13.6B
| $656K | ﹤0.01% |
10,200
-11,700
| -53% | -$667K |
|
3566
PUT
Lifestance Health
LFST
$4.29B
| $655K | ﹤0.01% |
106,300
+41,500
| +64% | +$279K |
|
3567
CALL
Remitly
RELY
$4.91B
| $655K | ﹤0.01% |
31,600
+6,600
| +26% | +$125K |
|
3568
Rogers Corp
ROG
$2.13B
| $655K | ﹤0.01% |
5,520
-421
| -7% | -$49.2K |
|
3569
Target Hospitality
TH
$1.47B
| $655K | ﹤0.01% |
+60,301
| New | +$566K |
|
3570
PUT
Mitek Systems
MITK
$758M
| $654K | ﹤0.01% |
46,400
+40,000
| +625% | +$490K |
|
3571
CALL
Rocket Pharmaceuticals
RCKT
$343M
| $654K | ﹤0.01% |
24,300
-24,400
| -50% | -$693K |
|
3572
PUT
Algoma Steel
ASTL
$463M
| $653K | ﹤0.01% |
77,000
+14,200
| +23% | +$120K |
|
3573
CALL
EVgo
EVGO
$230M
| $653K | ﹤0.01% |
260,400
-115,400
| -31% | -$299K |
|
3574
PUT
Malibu Boats
MBUU
$559M
| $653K | ﹤0.01% |
15,100
+12,900
| +586% | +$591K |
|
3575
PUT
UWM Holdings
UWMC
$631M
| $653K | ﹤0.01% |
90,000
+15,900
| +21% | +$107K |
|
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.