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 | |
|---|---|---|---|---|---|---|
3976
CALL
Ryan Specialty Holdings
RYAN
$6.05B
| $438K | ﹤0.01% |
7,900
-2,200
| -22% | -$105K |
|
3977
CALL
SELLAS Life Sciences
SLS
$1.96B
| $437K | ﹤0.01% |
433,000
+87,600
| +25% | +$73.6K |
|
|
UNIT
3978
CALL
Uniti Group
UNIT
$2.47B
| $437K | ﹤0.01% |
74,100
+10,600
| +17% | +$60.6K |
|
3979
Lumen
LUMN
$6.3B
| $436K | ﹤0.01% |
+279,510
| New | +$437K |
|
3980
PUT
Piper Sandler
PIPR
$5.09B
| $436K | ﹤0.01% |
8,800
+8,400
| +2,100% | +$384K |
|
|
INFA
3981
DELISTED
Informatica
INFA
| $435K | ﹤0.01% |
+12,456
| New | +$392K |
|
3982
PUT
ING
ING
$93.2B
| $435K | ﹤0.01% |
26,400
-235,900
| -90% | -$3.37M |
|
3983
CALL
PRA Group
PRAA
$681M
| $435K | ﹤0.01% |
16,700
+11,800
| +241% | +$288K |
|
3984
XPEL
XPEL
$1.2B
| $434K | ﹤0.01% |
8,039
+4,999
| +164% | +$262K |
|
3985
ADT
ADT
$5.41B
| $433K | ﹤0.01% |
64,533
-109,465
| -63% | -$727K |
|
|
ATSG
3986
PUT
DELISTED
Air Transport Services Group
ATSG
| $433K | ﹤0.01% |
31,500
+30,000
| +2,000% | +$432K |
|
3987
PUT
Assurant
AIZ
$14B
| $432K | ﹤0.01% |
2,300
+1,600
| +229% | +$279K |
|
3988
CALL
Brighthouse Financial
BHF
$3.66B
| $432K | ﹤0.01% |
8,400
-6,000
| -42% | -$298K |
|
3989
PUT
Coty
COTY
$2.37B
| $432K | ﹤0.01% |
36,200
-357,100
| -91% | -$4.36M |
|
3990
JELD-WEN Holding
JELD
$103M
| $432K | ﹤0.01% |
20,386
+19,111
| +1,499% | +$357K |
|
3991
PUT
RBC Bearings
RBC
$17.6B
| $432K | ﹤0.01% |
1,600
-2,200
| -58% | -$594K |
|
|
SA
3992
PUT
Seabridge Gold
SA
$2.65B
| $432K | ﹤0.01% |
28,600
-34,400
| -55% | -$401K |
|
3993
PUT
Heartland Express
HTLD
$1B
| $431K | ﹤0.01% |
36,100
+35,600
| +7,120% | +$453K |
|
3994
PUT
Amplify Energy
AMPY
$156M
| $429K | ﹤0.01% |
65,000
-42,300
| -39% | -$257K |
|
|
KYNB
3995
Kyntra Bio
KYNB
$28.2M
| $429K | ﹤0.01% |
7,307
+6,324
| +643% | +$272K |
|
3996
Nabors Industries
NBR
$1.16B
| $429K | ﹤0.01% |
4,985
-198
| -4% | -$16.2K |
|
3997
Spectrum Brands
SPB
$2.03B
| $429K | ﹤0.01% |
4,820
-12,592
| -72% | -$1.03M |
|
3998
CALL
Stoke Therapeutics
STOK
$1.82B
| $429K | ﹤0.01% |
+31,800
| New | +$193K |
|
3999
ChargePoint
CHPT
$136M
| $428K | ﹤0.01% |
+11,285
| New | +$443K |
|
4000
PUT
Carpenter Technology
CRS
$26.4B
| $428K | ﹤0.01% |
6,000
+1,900
| +46% | +$124K |
|
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.