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 |
Amazon
AMZN
|
+$168M |
| 2 |
NVIDIA
NVDA
|
+$141M |
| 3 |
TSMC
TSM
|
+$121M |
| 4 |
Meta Platforms (Facebook)
META
|
+$107M |
| 5 |
SPDR Gold Trust
GLD
|
+$103M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$174M |
| 2 |
Western Digital
WDC
|
+$87.7M |
| 3 |
Broadcom
AVGO
|
+$62.2M |
| 4 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$52M |
| 5 |
Netflix
NFLX
|
+$44.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.3% |
| 2 | Technology | 0.62% |
| 3 | Communication Services | 0.22% |
| 4 | Consumer Discretionary | 0.21% |
| 5 | Healthcare | 0.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
|
SILA
6051
PUT
DELISTED
Sila Realty Trust
SILA
| $42.6K | ﹤0.01% |
1,800
+100
| +6% | +$2.45K |
2024 Q3
6 quarters
|
|
6052
Arlo Technologies
ARLO
$1.37B
| $42.5K | ﹤0.01% |
2,986
+2,811
| +1,606% | +$37.6K |
2025 Q4
1 quarter
|
|
6053
PUT
Credit Acceptance
CACC
$5.31B
| $42.3K | ﹤0.01% |
100
-100
| -50% | -$47.2K |
2025 Q1
4 quarters
|
|
6054
NETSCOUT
NTCT
$2.93B
| $42.2K | ﹤0.01% |
+1,328
| New | +$38.5K |
2026 Q1
0 quarters
|
|
6055
PUT
Kontoor Brands
KTB
$3.47B
| $42.2K | ﹤0.01% |
600
-600
| -50% | -$39.3K |
2025 Q4
1 quarter
|
|
6056
CALL
Comstock
LODE
$171M
| $42.1K | ﹤0.01% |
13,800
-92,800
| -87% | -$304K |
2020 Q3
22 quarters
|
|
6057
Aclaris Therapeutics
ACRS
$649M
| $42.1K | ﹤0.01% |
11,216
-5,452
| -33% | -$18.4K |
2025 Q4
1 quarter
|
|
6058
2x Long VIX Futures ETF
UVIX
$197M
| $42K | ﹤0.01% |
+242
| New | +$32.6K |
2026 Q1
0 quarters
|
|
6059
CALL
Core Laboratories
CLB
$448M
| $42K | ﹤0.01% |
2,500
+2,300
| +1,150% | +$41.2K |
2015 Q1
44 quarters
|
|
6060
CALL
Insulet
PODD
$9.07B
| $42K | ﹤0.01% |
200
-12,400
| -98% | -$3.12M |
2017 Q4
33 quarters
|
|
6061
PUT
Ibotta
IBTA
$804M
| $42K | ﹤0.01% |
1,400
-2,000
| -59% | -$46.8K |
2024 Q4
5 quarters
|
|
|
UMH
6062
CALL
UMH Properties
UMH
$1.31B
| $41.8K | ﹤0.01% |
2,900
+1,800
| +164% | +$27.9K |
2020 Q3
22 quarters
|
|
|
MAZE
6063
PUT
Maze Therapeutics
MAZE
$1.48B
| $41.8K | ﹤0.01% |
+1,400
| New | +$61.8K |
2026 Q1
0 quarters
|
|
6064
CALL
Ponce Financial Group
PDLB
$486M
| $41.8K | ﹤0.01% |
2,500
+2,400
| +2,400% | +$39.6K |
2025 Q4
1 quarter
|
|
|
TECX
6065
Tectonic Therapeutic
TECX
$443M
| $41.8K | ﹤0.01% |
1,351
-7,791
| -85% | -$192K |
2025 Q3
2 quarters
|
|
6066
Acuity Brands
AYI
$8.96B
| $41.8K | ﹤0.01% |
+149
| New | +$45.3K |
2026 Q1
0 quarters
|
|
|
YALA
6067
PUT
Yalla Group
YALA
$812M
| $41.7K | ﹤0.01% |
6,700
| – | – |
2021 Q1
20 quarters
|
|
6068
Hippo Holdings
HIPO
$832M
| $41.7K | ﹤0.01% |
+1,601
| New | +$45.6K |
2026 Q1
0 quarters
|
|
|
CIFU
6069
T-REX 2X Long CIFR Daily Target ETF
CIFU
$10.4M
| $41.7K | ﹤0.01% |
+3,513
| New | +$76.8K |
2026 Q1
0 quarters
|
|
6070
CALL
CVRx
CVRX
$40.8M
| $41.6K | ﹤0.01% |
4,400
-1,700
| -28% | -$12.4K |
2023 Q1
12 quarters
|
|
|
RDTL
6071
GraniteShares 2x Long RDDT Daily ETF
RDTL
$52M
| $41.5K | ﹤0.01% |
2,802
-4,933
| -64% | -$136K |
2025 Q4
1 quarter
|
|
6072
PUT
Organogenesis Holdings
ORGO
$180M
| $41.5K | ﹤0.01% |
17,500
+16,400
| +1,491% | +$56.8K |
2022 Q4
13 quarters
|
|
6073
CALL
Waterstone Financial
WSBF
$353M
| $41.5K | ﹤0.01% |
+2,300
| New | +$40.9K |
2026 Q1
0 quarters
|
|
|
CMRC
6074
CALL
Commerce.com Inc Series 1
CMRC
$268M
| $41.4K | ﹤0.01% |
15,500
-4,600
| -23% | -$14.3K |
2020 Q3
22 quarters
|
|
6075
CALL
Terex
TEX
$6.28B
| $41.4K | ﹤0.01% |
700
+500
| +250% | +$31K |
2014 Q4
45 quarters
|
|
Similar funds
Simplex Trading's Q1 2026 Portfolio in Review
As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q1 2026 filing shows 2,157 new, 2,651 increased, 3,926 reduced and 1,574 closed positions. Its largest new stake was Amazon: 764,884 shares worth $159M. The largest sale was Apple, an estimated $174M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
- Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
- Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
- Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
- Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
- Simplex Trading opened 2,157 new positions and closed 1,574 in Q1 2026.
- Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.
Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.