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 | |
|---|---|---|---|---|---|---|
2176
CALL
Under Armour Class C
UA
$2.92B
| $2.52M | ﹤0.01% |
350,600
-97,400
| -22% | -$746K |
|
2177
CALL
Root
ROOT
$917M
| $2.52M | ﹤0.01% |
41,200
+7,400
| +22% | +$174K |
|
2178
CALL
Vipshop
VIPS
$6.84B
| $2.51M | ﹤0.01% |
151,900
-3,100
| -2% | -$52.2K |
|
|
NVMI
2179
PUT
Nova
NVMI
$13.9B
| $2.5M | ﹤0.01% |
14,100
+12,500
| +781% | +$1.97M |
|
2180
PUT
Western Union
WU
$2.57B
| $2.5M | ﹤0.01% |
178,900
-54,300
| -23% | -$699K |
|
2181
PUT
JFrog
FROG
$9.71B
| $2.49M | ﹤0.01% |
56,400
+52,300
| +1,276% | +$2.03M |
|
2182
Microchip Technology
MCHP
$42.8B
| $2.49M | ﹤0.01% |
+27,804
| New | +$2.4M |
|
2183
Lightspeed Commerce
LSPD
$1.3B
| $2.49M | ﹤0.01% |
177,260
+13,662
| +8% | +$217K |
|
2184
CALL
Recursion Pharmaceuticals
RXRX
$1.57B
| $2.49M | ﹤0.01% |
249,900
+144,600
| +137% | +$1.61M |
|
2185
Caterpillar
CAT
$409B
| $2.48M | ﹤0.01% |
+6,779
| New | +$2.17M |
|
2186
PUT
PennyMac Financial
PFSI
$4.38B
| $2.48M | ﹤0.01% |
27,200
-137,100
| -83% | -$12M |
|
2187
CALL
NextNav
NN
$1.7B
| $2.47M | ﹤0.01% |
376,000
+351,800
| +1,454% | +$1.57M |
|
2188
PUT
Ramaco Resources Class A
METC
$676M
| $2.47M | ﹤0.01% |
151,834
+135,813
| +848% | +$2.41M |
|
|
ALTR
2189
PUT
DELISTED
Altair Engineering Inc
ALTR
| $2.47M | ﹤0.01% |
28,700
+18,100
| +171% | +$1.54M |
|
2190
Reddit
RDDT
$32.5B
| $2.47M | ﹤0.01% |
+50,033
| New | +$2.74M |
|
2191
PUT
Cardlytics
CDLX
$21M
| $2.47M | ﹤0.01% |
17,020
+11,610
| +215% | +$980K |
|
2192
PUT
Kornit Digital
KRNT
$706M
| $2.46M | ﹤0.01% |
136,000
+9,400
| +7% | +$165K |
|
2193
PUT
Enbridge
ENB
$124B
| $2.46M | ﹤0.01% |
68,100
+18,200
| +36% | +$646K |
|
2194
Sensata Technologies
ST
$6.65B
| $2.46M | ﹤0.01% |
67,013
+43,418
| +184% | +$1.52M |
|
2195
Cloudflare
NET
$93B
| $2.46M | ﹤0.01% |
+25,424
| New | +$2.3M |
|
2196
PUT
Target Hospitality
TH
$1.61B
| $2.46M | ﹤0.01% |
226,200
-64,800
| -22% | -$609K |
|
2197
PUT
Celldex Therapeutics
CLDX
$2.77B
| $2.46M | ﹤0.01% |
58,500
+31,700
| +118% | +$1.3M |
|
|
CRON
2198
PUT
Cronos Group
CRON
$1.05B
| $2.46M | ﹤0.01% |
940,900
+537,400
| +133% | +$1.15M |
|
2199
Allstate
ALL
$66.9B
| $2.45M | ﹤0.01% |
14,178
-27,030
| -66% | -$4.27M |
|
2200
PUT
Entergy
ETR
$54.1B
| $2.45M | ﹤0.01% |
46,400
+10,600
| +30% | +$537K |
|
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.