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 | |
|---|---|---|---|---|---|---|---|
6701
Wrap Technologies
WRAP
$88.3M
| $22.1K | ﹤0.01% |
14,319
-29,728
| -67% | -$58.6K |
2024 Q4
5 quarters
|
|
6702
CALL
Ceragon Networks
CRNT
$192M
| $22K | ﹤0.01% |
10,200
+1,400
| +16% | +$3.17K |
2023 Q1
12 quarters
|
|
|
CMRC
6703
Commerce.com Inc Series 1
CMRC
$268M
| $22K | ﹤0.01% |
8,251
+7,097
| +615% | +$22.1K |
2025 Q3
2 quarters
|
|
|
ADUR
6704
CALL
Aduro Clean Technologies
ADUR
$433M
| $22K | ﹤0.01% |
+2,100
| New | +$24.8K |
2026 Q1
0 quarters
|
|
6705
PUT
LifeMD
LFMD
$138M
| $22K | ﹤0.01% |
6,100
+1,900
| +45% | +$6.57K |
2021 Q1
20 quarters
|
|
6706
CALL
Virtu Financial
VIRT
$4.91B
| $22K | ﹤0.01% |
500
-3,000
| -86% | -$117K |
2016 Q4
37 quarters
|
|
|
ZENA
6707
ZenaTech Inc
ZENA
$120M
| $21.9K | ﹤0.01% |
+9,578
| New | +$29K |
2026 Q1
0 quarters
|
|
6708
PUT
Alpha Architect US Quantitative Value ETF
QVAL
$607M
| $21.9K | ﹤0.01% |
400
+200
| +100% | +$10.4K |
2025 Q4
1 quarter
|
|
|
QBTX
6709
Tradr 2X Long QBTS Daily ETF
QBTX
$264M
| $21.9K | ﹤0.01% |
+690
| New | +$57.4K |
2026 Q1
0 quarters
|
|
6710
CALL
LeMaitre Vascular
LMAT
$1.83B
| $21.8K | ﹤0.01% |
+200
| New | +$19.1K |
2026 Q1
0 quarters
|
|
6711
CALL
Televisa
TV
$1.19B
| $21.8K | ﹤0.01% |
7,500
| – | – |
2025 Q4
1 quarter
|
|
6712
Willdan Group
WLDN
$1.12B
| $21.8K | ﹤0.01% |
+285
| New | +$30.2K |
2026 Q1
0 quarters
|
|
6713
PUT
Parsons
PSN
$4.38B
| $21.7K | ﹤0.01% |
400
-3,100
| -89% | -$198K |
2023 Q3
10 quarters
|
|
6714
Alaska Air
ALK
$4.41B
| $21.7K | ﹤0.01% |
+589
| New | +$28.4K |
2026 Q1
0 quarters
|
|
6715
PUT
STAG Industrial
STAG
$6.89B
| $21.6K | ﹤0.01% |
600
-200
| -25% | -$7.58K |
2017 Q4
33 quarters
|
|
6716
iShares MSCI Italy ETF
EWI
$1.07B
| $21.6K | ﹤0.01% |
405
-3,700
| -90% | -$203K |
2025 Q4
1 quarter
|
|
6717
PUT
Alector
ALEC
$208M
| $21.5K | ﹤0.01% |
10,000
-13,100
| -57% | -$26.3K |
2025 Q3
2 quarters
|
|
|
CNTB
6718
PUT
Connect Biopharma Holdings
CNTB
$61.7M
| $21.5K | ﹤0.01% |
8,200
+7,300
| +811% | +$19K |
2025 Q4
1 quarter
|
|
6719
iRhythm Holdings
IRTC
$3.66B
| $21.5K | ﹤0.01% |
+182
| New | +$26.3K |
2026 Q1
0 quarters
|
|
6720
Belden
BDC
$4.23B
| $21.5K | ﹤0.01% |
+187
| New | +$23.6K |
2026 Q1
0 quarters
|
|
6721
PUT
Genmab
GMAB
$21.6B
| $21.5K | ﹤0.01% |
800
-2,400
| -75% | -$71.9K |
2022 Q4
13 quarters
|
|
|
OLP
6722
PUT
One Liberty Properties
OLP
$482M
| $21.5K | ﹤0.01% |
1,000
-300
| -23% | -$6.66K |
2025 Q3
2 quarters
|
|
6723
Travelzoo
TZOO
$53.5M
| $21.4K | ﹤0.01% |
3,621
+2,165
| +149% | +$13.2K |
2024 Q3
6 quarters
|
|
6724
PUT
Healthpeak Properties
DOC
$13.4B
| $21.4K | ﹤0.01% |
1,300
-5,000
| -79% | -$85.7K |
2014 Q4
45 quarters
|
|
6725
PUT
MidCap Financial Investment
MFIC
$720M
| $21.4K | ﹤0.01% |
+1,900
| New | +$20.9K |
2026 Q1
0 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.