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 | |
|---|---|---|---|---|---|---|---|
|
MVLL
6176
GraniteShares 2x Long MRVL Daily ETF
MVLL
$448M
| $37K | ﹤0.01% |
4,281
-9,681
| -69% | -$64.9K |
2025 Q3
2 quarters
|
|
6177
PUT
Mirum Pharmaceuticals
MIRM
$5.45B
| $37K | ﹤0.01% |
+400
| New | +$37.6K |
2026 Q1
0 quarters
|
|
|
AFCG
6178
CALL
AFC Gamma
AFCG
$78.3M
| $36.9K | ﹤0.01% |
13,100
-400
| -3% | -$997 |
2025 Q3
2 quarters
|
|
6179
Roundhill Bitcoin Covered Call Strategy ETF
YBTC
$146M
| $36.9K | ﹤0.01% |
1,753
-1,492
| -46% | -$35.8K |
2025 Q4
1 quarter
|
|
|
SGMO
6180
CALL
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $36.9K | ﹤0.01% |
149,400
-283,100
| -65% | -$113K |
2021 Q2
19 quarters
|
|
6181
iShares Global Timber & Forestry ETF
WOOD
$254M
| $36.9K | ﹤0.01% |
+520
| New | +$39K |
2026 Q1
0 quarters
|
|
6182
PUT
Oportun Financial
OPRT
$378M
| $36.9K | ﹤0.01% |
8,000
+4,400
| +122% | +$22.4K |
2025 Q4
1 quarter
|
|
6183
CALL
UFP Industries
UFPI
$4.25B
| $36.8K | ﹤0.01% |
400
| – | – |
2025 Q4
1 quarter
|
|
|
NIU
6184
Niu Technologies
NIU
$146M
| $36.8K | ﹤0.01% |
12,723
+774
| +6% | +$2.57K |
2024 Q3
6 quarters
|
|
|
LIF
6185
PUT
Life360
LIF
$3.28B
| $36.7K | ﹤0.01% |
900
-700
| -44% | -$36.2K |
2025 Q2
3 quarters
|
|
|
RDNW
6186
CALL
RideNow Group
RDNW
$207M
| $36.7K | ﹤0.01% |
5,200
+1,900
| +58% | +$11.5K |
2025 Q4
1 quarter
|
|
6187
AMC Global Media
AMCX
$463M
| $36.6K | ﹤0.01% |
5,396
+753
| +16% | +$5.86K |
2024 Q1
8 quarters
|
|
6188
Bentley Systems
BSY
$9.89B
| $36.6K | ﹤0.01% |
1,043
-1,951
| -65% | -$71.7K |
2025 Q4
1 quarter
|
|
6189
PUT
Paycom
PAYC
$10.3B
| $36.5K | ﹤0.01% |
300
-200
| -40% | -$26.8K |
2015 Q2
43 quarters
|
|
|
KYIV
6190
PUT
Kyivstar Group
KYIV
$2.87B
| $36.4K | ﹤0.01% |
3,600
+3,100
| +620% | +$36.7K |
2025 Q3
2 quarters
|
|
6191
AlTi Global
ALTI
$343M
| $36.4K | ﹤0.01% |
10,056
-24,804
| -71% | -$105K |
2025 Q3
2 quarters
|
|
6192
PUT
Artisan Partners
APAM
$2.57B
| $36.4K | ﹤0.01% |
1,000
-2,600
| -72% | -$106K |
2019 Q2
27 quarters
|
|
6193
CALL
Watsco Inc
WSO
$12.4B
| $36.4K | ﹤0.01% |
+100
| New | +$38.7K |
2026 Q1
0 quarters
|
|
6194
PUT
Lear
LEA
$5.99B
| $36.3K | ﹤0.01% |
300
-100
| -25% | -$12.5K |
2014 Q4
45 quarters
|
|
6195
PUT
Snap-on
SNA
$19B
| $36.3K | ﹤0.01% |
100
-200
| -67% | -$74.1K |
2025 Q3
2 quarters
|
|
6196
CALL
Nexstar Media Group
NXST
$4.89B
| $36.2K | ﹤0.01% |
200
+100
| +100% | +$22.4K |
2021 Q1
20 quarters
|
|
6197
PUT
Brookfield Infrastructure Partners
BIP
$16.5B
| $36.1K | ﹤0.01% |
1,000
-18,900
| -95% | -$694K |
2017 Q2
35 quarters
|
|
|
MAZE
6198
Maze Therapeutics
MAZE
$1.48B
| $36.1K | ﹤0.01% |
+1,210
| New | +$53.4K |
2026 Q1
0 quarters
|
|
6199
iShares US Oil & Gas Exploration & Production ETF
IEO
$757M
| $36.1K | ﹤0.01% |
+289
| New | +$30.6K |
2026 Q1
0 quarters
|
|
|
PINE
6200
PUT
Alpine Income Property Trust
PINE
$311M
| $36K | ﹤0.01% |
2,000
+200
| +11% | +$3.71K |
2024 Q1
8 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.