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 | |
|---|---|---|---|---|---|---|---|
4276
PUT
Fastenal
FAST
$57.6B
| $204K | ﹤0.01% |
4,400
-108,900
| -96% | -$4.89M |
2014 Q4
45 quarters
|
|
|
MNTN
4277
CALL
MNTN Inc
MNTN
$773M
| $204K | ﹤0.01% |
23,200
-1,600
| -6% | -$16K |
2025 Q2
3 quarters
|
|
4278
Oaktree Specialty Lending
OCSL
$1.06B
| $203K | ﹤0.01% |
+17,961
| New | +$215K |
2026 Q1
0 quarters
|
|
4279
CALL
Stride
LRN
$3.22B
| $203K | ﹤0.01% |
2,300
-26,200
| -92% | -$2.13M |
2019 Q1
28 quarters
|
|
4280
Newmark Group
NMRK
$2.29B
| $203K | ﹤0.01% |
13,521
+12,590
| +1,352% | +$199K |
2025 Q1
4 quarters
|
|
|
SEZL
4281
PUT
Sezzle
SEZL
$3.69B
| $203K | ﹤0.01% |
3,200
+700
| +28% | +$47.7K |
2025 Q2
3 quarters
|
|
|
PVLA
4282
Palvella Therapeutics
PVLA
$1.91B
| $202K | ﹤0.01% |
+1,622
| New | +$169K |
2026 Q1
0 quarters
|
|
4283
PUT
abrdn Physical Palladium Shares ETF
PALL
$619M
| $202K | ﹤0.01% |
7,500
-249,000
| -97% | -$7.71M |
2025 Q1
4 quarters
|
|
4284
KE Holdings
BEKE
$18.3B
| $202K | ﹤0.01% |
+13,481
| New | +$231K |
2026 Q1
0 quarters
|
|
4285
4D Molecular Therapeutics
FDMT
$765M
| $202K | ﹤0.01% |
+21,660
| New | +$189K |
2026 Q1
0 quarters
|
|
4286
TG Therapeutics
TGTX
$8.21B
| $202K | ﹤0.01% |
6,069
-34,973
| -85% | -$1.04M |
2025 Q3
2 quarters
|
|
4287
LGI Homes
LGIH
$1.11B
| $202K | ﹤0.01% |
+5,099
| New | +$249K |
2026 Q1
0 quarters
|
|
4288
CALL
Vita Coco
COCO
$3.3B
| $201K | ﹤0.01% |
4,200
-19,600
| -82% | -$1.07M |
2021 Q4
17 quarters
|
|
4289
Pinnacle West Capital
PNW
$11.5B
| $201K | ﹤0.01% |
+1,996
| New | +$193K |
2026 Q1
0 quarters
|
|
|
EH
4290
PUT
EHang Holdings
EH
$309M
| $201K | ﹤0.01% |
20,700
-67,200
| -76% | -$827K |
2021 Q1
20 quarters
|
|
4291
CALL
HCI Group
HCI
$2.26B
| $201K | ﹤0.01% |
1,300
-400
| -24% | -$65.5K |
2025 Q2
3 quarters
|
|
|
CRCA
4292
ProShares Ultra CRCL
CRCA
$102M
| $201K | ﹤0.01% |
4,865
+4,433
| +1,026% | +$184K |
2025 Q3
2 quarters
|
|
4293
Kimbell Royalty Partners
KRP
$1.46B
| $201K | ﹤0.01% |
13,879
+1,479
| +12% | +$20.3K |
2025 Q4
1 quarter
|
|
4294
BBB Foods
TBBB
$6.29B
| $201K | ﹤0.01% |
5,676
-1,288
| -18% | -$45.1K |
2025 Q1
4 quarters
|
|
4295
CALL
Azenta
AZTA
$1.51B
| $201K | ﹤0.01% |
9,500
+2,000
| +27% | +$59.8K |
2021 Q2
19 quarters
|
|
4296
PUT
Aura Biosciences
AURA
$626M
| $201K | ﹤0.01% |
+30,000
| New | +$172K |
2026 Q1
0 quarters
|
|
4297
CALL
Leonardo DRS
DRS
$9.81B
| $200K | ﹤0.01% |
4,500
-2,100
| -32% | -$88.5K |
2022 Q4
13 quarters
|
|
4298
KBR
KBR
$4.42B
| $200K | ﹤0.01% |
5,430
+3,049
| +128% | +$125K |
2025 Q3
2 quarters
|
|
4299
Allegion
ALLE
$13.1B
| $200K | ﹤0.01% |
1,376
+587
| +74% | +$93.6K |
2025 Q2
3 quarters
|
|
4300
Palladyne AI
PDYN
$263M
| $200K | ﹤0.01% |
32,895
+16,326
| +99% | +$111K |
2025 Q1
4 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.