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 | |
|---|---|---|---|---|---|---|
4701
Arbutus Biopharma
ABUS
$871M
| $227K | ﹤0.01% |
88,130
-16,330
| -16% | -$42.3K |
|
4702
PUT
Alphatec Holdings
ATEC
$1.49B
| $227K | ﹤0.01% |
16,500
+5,400
| +49% | +$80.1K |
|
4703
PUT
iShares S&P GSCI Commodity-Indexed Trust
GSG
$995M
| $227K | ﹤0.01% |
10,300
-2,300
| -18% | -$48.3K |
|
4704
CALL
MidCap Financial Investment
MFIC
$796M
| $227K | ﹤0.01% |
15,100
+4,900
| +48% | +$69.5K |
|
4705
PUT
NGL Energy Partners
NGL
$2.01B
| $227K | ﹤0.01% |
39,500
+11,100
| +39% | +$63.3K |
|
4706
CALL
RPC Inc
RES
$1.2B
| $227K | ﹤0.01% |
29,400
+18,200
| +163% | +$131K |
|
|
RCM
4707
CALL
DELISTED
R1 RCM Inc. Common Stock
RCM
| $227K | ﹤0.01% |
17,700
+9,700
| +121% | +$113K |
|
4708
CALL
Energizer
ENR
$1.44B
| $226K | ﹤0.01% |
7,700
+1,100
| +17% | +$33.2K |
|
|
HDSN
4709
Hudson Technologies
HDSN
$244M
| $226K | ﹤0.01% |
20,575
+19,423
| +1,686% | +$253K |
|
4710
CALL
IPG Photonics
IPGP
$3.6B
| $226K | ﹤0.01% |
2,500
+1,800
| +257% | +$169K |
|
4711
CALL
Matrix Service
MTRX
$320M
| $226K | ﹤0.01% |
17,400
+15,000
| +625% | +$168K |
|
4712
ProShares UltraShort Bloomberg Crude Oil
SCO
$678M
| $226K | ﹤0.01% |
+3,528
| New | +$260K |
|
4713
Xponential Fitness
XPOF
$273M
| $226K | ﹤0.01% |
+13,703
| New | +$168K |
|
4714
CALL
Zymeworks
ZYME
$1.67B
| $226K | ﹤0.01% |
21,500
+17,900
| +497% | +$199K |
|
|
AY
4715
DELISTED
Atlantica Sustainable Infrastructure plc Ordinary Shares
AY
| $226K | ﹤0.01% |
12,276
+7,047
| +135% | +$133K |
|
4716
PUT
Digital Turbine
APPS
$990M
| $225K | ﹤0.01% |
86,100
-49,900
| -37% | -$212K |
|
4717
CALL
Simpson Manufacturing
SSD
$7.68B
| $225K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$194K |
|
|
INVX
4718
CALL
Innovex International
INVX
$1.85B
| $225K | ﹤0.01% |
10,000
+1,000
| +11% | +$21.9K |
|
4719
PUT
Invesco CurrencyShares Canadian Dollar Trust
FXC
$73.2M
| $224K | ﹤0.01% |
3,100
+2,400
| +343% | +$174K |
|
4720
CALL
Holley
HLLY
$326M
| $224K | ﹤0.01% |
50,300
+42,300
| +529% | +$193K |
|
4721
CALL
Interparfums
IPAR
$4.02B
| $224K | ﹤0.01% |
1,600
+1,500
| +1,500% | +$212K |
|
4722
CALL
Steris
STE
$22.5B
| $224K | ﹤0.01% |
1,000
-31,800
| -97% | -$7.17M |
|
4723
Celanese
CE
$4.91B
| $223K | ﹤0.01% |
1,303
-28,766
| -96% | -$4.38M |
|
4724
CALL
America Movil
AMX
$76B
| $222K | ﹤0.01% |
11,900
+600
| +5% | +$11K |
|
4725
CALL
Churchill Downs
CHDN
$5.76B
| $222K | ﹤0.01% |
1,800
-14,700
| -89% | -$1.78M |
|
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.