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 | |
|---|---|---|---|---|---|---|
|
SEMR
5026
DELISTED
Semrush
SEMR
| $171K | ﹤0.01% |
+12,963
| New | +$156K |
|
5027
Xenon Pharmaceuticals
XENE
$6.06B
| $171K | ﹤0.01% |
3,977
-24,410
| -86% | -$1.12M |
|
|
INBX
5028
CALL
DELISTED
Inhibrx, Inc. Common Stock
INBX
| $171K | ﹤0.01% |
4,900
-47,100
| -91% | -$1.72M |
|
5029
CALL
Dyne Therapeutics
DYN
$4.7B
| $170K | ﹤0.01% |
6,000
+5,300
| +757% | +$120K |
|
5030
PUT
Empire State Realty Trust
ESRT
$872M
| $170K | ﹤0.01% |
16,800
+1,000
| +6% | +$9.86K |
|
5031
CALL
Knife River
KNF
$4.15B
| $170K | ﹤0.01% |
2,100
-5,500
| -72% | -$386K |
|
5032
CALL
Omeros
OMER
$857M
| $170K | ﹤0.01% |
49,300
+6,600
| +15% | +$25.1K |
|
5033
Alto Ingredients
ALTO
$369M
| $169K | ﹤0.01% |
77,871
-24,408
| -24% | -$51.5K |
|
5034
CALL
Brookfield Renewable
BEPC
$6.08B
| $169K | ﹤0.01% |
6,900
-1,000
| -13% | -$26.2K |
|
5035
PUT
Hayward Holdings
HAYW
$3.21B
| $169K | ﹤0.01% |
11,100
-4,000
| -26% | -$53.5K |
|
5036
Lufax Holding
LU
$1.35B
| $169K | ﹤0.01% |
40,105
+7,971
| +25% | +$22.3K |
|
|
SVC
5037
PUT
Service Properties Trust
SVC
$1.04B
| $169K | ﹤0.01% |
5,000
+2,440
| +95% | +$90.5K |
|
5038
PUT
nCino
NCNO
$2.02B
| $168K | ﹤0.01% |
4,500
-3,300
| -42% | -$104K |
|
|
PDS
5039
PUT
Precision Drilling
PDS
$999M
| $168K | ﹤0.01% |
+2,500
| New | +$151K |
|
|
NS
5040
DELISTED
NuStar Energy L.P.
NS
| $168K | ﹤0.01% |
+7,257
| New | +$160K |
|
5041
PUT
Arbutus Biopharma
ABUS
$857M
| $167K | ﹤0.01% |
65,100
+60,700
| +1,380% | +$157K |
|
5042
Digital Turbine
APPS
$975M
| $167K | ﹤0.01% |
+64,038
| New | +$272K |
|
5043
KLX Energy Services
KLXE
$45M
| $167K | ﹤0.01% |
21,614
+14,263
| +194% | +$127K |
|
5044
MDU Resources
MDU
$4.17B
| $167K | ﹤0.01% |
12,029
-41,482
| -78% | -$480K |
|
|
PDM
5045
CALL
Piedmont Realty Trust
PDM
$1.21B
| $167K | ﹤0.01% |
23,800
+22,000
| +1,222% | +$147K |
|
5046
PUT
Supernus Pharmaceuticals
SUPN
$2.59B
| $167K | ﹤0.01% |
4,900
+600
| +14% | +$17.9K |
|
5047
Cactus
WHD
$5.21B
| $167K | ﹤0.01% |
3,346
+1,683
| +101% | +$74.5K |
|
5048
CALL
Amphastar Pharmaceuticals
AMPH
$879M
| $166K | ﹤0.01% |
3,800
-100
| -3% | -$5.17K |
|
5049
CALL
Andersons Inc
ANDE
$2.41B
| $166K | ﹤0.01% |
2,900
+2,400
| +480% | +$129K |
|
5050
Builders FirstSource
BLDR
$7.15B
| $166K | ﹤0.01% |
+798
| New | +$147K |
|
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.