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 | |
|---|---|---|---|---|---|---|---|
4576
PUT
Trupanion
TRUP
$1.04B
| $159K | ﹤0.01% |
6,200
+4,100
| +195% | +$123K |
2017 Q4
33 quarters
|
|
4577
Dover
DOV
$25.3B
| $159K | ﹤0.01% |
761
-184
| -19% | -$39.3K |
2025 Q3
2 quarters
|
|
4578
CALL
Integer Holdings
ITGR
$4.3B
| $158K | ﹤0.01% |
1,800
+500
| +38% | +$42.6K |
2025 Q4
1 quarter
|
|
4579
PUT
Agree Realty
ADC
$8.09B
| $158K | ﹤0.01% |
2,100
+400
| +24% | +$30.3K |
2021 Q2
19 quarters
|
|
4580
iPath Series B S&P 500 VIX Mid-Term Futures ETN
VXZ
$28M
| $158K | ﹤0.01% |
2,612
+491
| +23% | +$27.1K |
2025 Q2
3 quarters
|
|
4581
Banco Santander
SAN
$193B
| $158K | ﹤0.01% |
+14,008
| New | +$167K |
2026 Q1
0 quarters
|
|
4582
Nabors Industries
NBR
$1.21B
| $158K | ﹤0.01% |
1,836
+1,572
| +595% | +$114K |
2025 Q3
2 quarters
|
|
4583
Global Payments
GPN
$21.2B
| $158K | ﹤0.01% |
+2,343
| New | +$173K |
2026 Q1
0 quarters
|
|
4584
PUT
Vanda Pharmaceuticals
VNDA
$291M
| $158K | ﹤0.01% |
22,800
-11,500
| -34% | -$88.7K |
2023 Q4
9 quarters
|
|
4585
PUT
ARK 21Shares Bitcoin ETF
ARKB
$3.23B
| $157K | ﹤0.01% |
7,000
-11,700
| -63% | -$297K |
2024 Q4
5 quarters
|
|
4586
Dianthus Therapeutics
DNTH
$4.94B
| $157K | ﹤0.01% |
1,875
-15,458
| -89% | -$895K |
2025 Q1
4 quarters
|
|
4587
CALL
AdaptHealth
AHCO
$758M
| $157K | ﹤0.01% |
13,200
-45,700
| -78% | -$468K |
2020 Q4
21 quarters
|
|
4588
PUT
E.W. Scripps
SSP
$245M
| $157K | ﹤0.01% |
42,200
+600
| +1% | +$2.21K |
2024 Q4
5 quarters
|
|
4589
PUT
First Bancorp
FNLC
$380M
| $157K | ﹤0.01% |
5,600
+200
| +4% | +$5.55K |
2025 Q4
1 quarter
|
|
4590
CALL
Cognex
CGNX
$10.5B
| $157K | ﹤0.01% |
3,200
-71,700
| -96% | -$3.35M |
2015 Q4
41 quarters
|
|
4591
Range Global Coal Index ETF
COAL
$52.7M
| $157K | ﹤0.01% |
+5,713
| New | +$149K |
2026 Q1
0 quarters
|
|
|
NA
4592
CALL
Nano Labs
NA
$47.3M
| $156K | ﹤0.01% |
52,800
-200
| -0.4% | -$638 |
2025 Q2
3 quarters
|
|
4593
PUT
MediaAlpha
MAX
$513M
| $156K | ﹤0.01% |
16,800
+12,500
| +291% | +$123K |
2023 Q2
11 quarters
|
|
|
SKYT
4594
CALL
DELISTED
SkyWater Technology
SKYT
| $156K | ﹤0.01% |
5,700
-221,700
| -97% | -$6.52M |
2021 Q4
17 quarters
|
|
4595
CALL
Alight
ALIT
$239M
| $156K | ﹤0.01% |
13,405
-28,030
| -68% | -$668K |
2021 Q4
17 quarters
|
|
4596
PUT
Cohu
COHU
$3.33B
| $156K | ﹤0.01% |
5,100
+300
| +6% | +$8.81K |
2025 Q3
2 quarters
|
|
|
HPP
4597
PUT
Hudson Pacific Properties
HPP
$620M
| $156K | ﹤0.01% |
26,400
+1,200
| +5% | +$9.21K |
2018 Q4
29 quarters
|
|
4598
CALL
Bank of Hawaii
BOH
$2.71B
| $156K | ﹤0.01% |
2,100
-3,700
| -64% | -$275K |
2019 Q2
27 quarters
|
|
4599
Oceaneering
OII
$4.42B
| $156K | ﹤0.01% |
4,394
+1,157
| +36% | +$37.4K |
2025 Q3
2 quarters
|
|
4600
PUT
indie Semiconductor
INDI
$668M
| $156K | ﹤0.01% |
48,300
+20,500
| +74% | +$72.4K |
2021 Q2
19 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.