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 | |
|---|---|---|---|---|---|---|---|
5951
Strategic Education
STRA
$1.79B
| $46.9K | ﹤0.01% |
565
+340
| +151% | +$27.7K |
2025 Q4
1 quarter
|
|
5952
Vericel Corp
VCEL
$2.05B
| $46.8K | ﹤0.01% |
1,456
+40
| +3% | +$1.42K |
2025 Q3
2 quarters
|
|
|
NIU
5953
CALL
Niu Technologies
NIU
$144M
| $46.8K | ﹤0.01% |
16,200
-29,000
| -64% | -$96.3K |
2025 Q1
4 quarters
|
|
5954
CALL
NeoGenomics
NEO
$2.37B
| $46.7K | ﹤0.01% |
6,300
-5,600
| -47% | -$58.9K |
2021 Q2
19 quarters
|
|
5955
Vanguard Long-Term Bond ETF
BLV
$5.47B
| $46.7K | ﹤0.01% |
679
+555
| +448% | +$38.7K |
2025 Q4
1 quarter
|
|
5956
PUT
iShares Core Dividend ETF
DIVB
$1.99B
| $46.5K | ﹤0.01% |
1,000
+800
| +400% | +$43.9K |
2021 Q3
18 quarters
|
|
5957
STAAR Surgical
STAA
$1.12B
| $46.5K | ﹤0.01% |
+2,488
| New | +$47.5K |
2026 Q1
0 quarters
|
|
5958
CALL
Advantage Solutions
ADV
$361M
| $46.5K | ﹤0.01% |
2,200
+2,088
| +1,864% | +$40.2K |
2025 Q3
2 quarters
|
|
5959
Colliers International
CIGI
$4.73B
| $46.5K | ﹤0.01% |
+435
| New | +$54.2K |
2026 Q1
0 quarters
|
|
|
MAPS
5960
CALL
DELISTED
WM TECHNOLOGY INC A
MAPS
| $46.5K | ﹤0.01% |
70,600
-4,200
| -6% | -$3.08K |
2021 Q1
20 quarters
|
|
5961
CALL
United States 12 Month Natural Gas Fund
UNL
$15.1M
| $46.2K | ﹤0.01% |
6,700
+4,200
| +168% | +$30.2K |
2025 Q3
2 quarters
|
|
5962
Community Bank
CBU
$3.22B
| $46.2K | ﹤0.01% |
+787
| New | +$48.2K |
2026 Q1
0 quarters
|
|
5963
CALL
James River Group Holdings
JRVR
$162M
| $46K | ﹤0.01% |
+7,300
| New | +$48K |
2026 Q1
0 quarters
|
|
5964
PUT
CONMED
CNMD
$1.4B
| $46K | ﹤0.01% |
+1,300
| New | +$52.9K |
2026 Q1
0 quarters
|
|
5965
PUT
MKS Inc
MKSI
$19.1B
| $46K | ﹤0.01% |
200
-900
| -82% | -$204K |
2017 Q1
36 quarters
|
|
5966
PUT
COPT Defense Properties
CDP
$3.83B
| $45.9K | ﹤0.01% |
1,500
-700
| -32% | -$21.8K |
2025 Q3
2 quarters
|
|
5967
V2X
VVX
$2.23B
| $45.9K | ﹤0.01% |
+670
| New | +$45.3K |
2026 Q1
0 quarters
|
|
5968
PUT
Immersion
IMMR
$246M
| $45.9K | ﹤0.01% |
8,400
+8,300
| +8,300% | +$52.3K |
2020 Q1
24 quarters
|
|
5969
Ginkgo Bioworks
DNA
$836M
| $45.8K | ﹤0.01% |
+7,474
| New | +$62.2K |
2026 Q1
0 quarters
|
|
|
CALY
5970
PUT
Callaway Golf Company
CALY
$2.57B
| $45.8K | ﹤0.01% |
+3,300
| New | +$46.3K |
2026 Q1
0 quarters
|
|
5971
Sprott Junior Uranium Miners ETF
URNJ
$313M
| $45.8K | ﹤0.01% |
1,563
-1,383
| -47% | -$44.4K |
2025 Q4
1 quarter
|
|
5972
PUT
American Battery Technology Co
ABAT
$319M
| $45.8K | ﹤0.01% |
16,400
-32,800
| -67% | -$127K |
2023 Q4
9 quarters
|
|
5973
PUT
GSI Technology
GSIT
$220M
| $45.7K | ﹤0.01% |
8,900
-14,300
| -62% | -$104K |
2023 Q2
11 quarters
|
|
|
FETH
5974
Fidelity Ethereum Fund
FETH
$1.48B
| $45.7K | ﹤0.01% |
2,188
-44,058
| -95% | -$1.05M |
2025 Q4
1 quarter
|
|
5975
PUT
SandRidge Energy
SD
$499M
| $45.7K | ﹤0.01% |
2,800
-7,600
| -73% | -$123K |
2020 Q4
21 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.