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 | |
|---|---|---|---|---|---|---|---|
4676
Coty
COTY
$2.37B
| $144K | ﹤0.01% |
71,527
-13,857
| -16% | -$37.2K |
2025 Q3
2 quarters
|
|
4677
PUT
Cullinan Oncology
CGEM
$966M
| $144K | ﹤0.01% |
10,100
+4,500
| +80% | +$57.8K |
2024 Q3
6 quarters
|
|
4678
PUT
Annexon
ANNX
$792M
| $143K | ﹤0.01% |
25,900
+5,000
| +24% | +$28.1K |
2023 Q4
9 quarters
|
|
4679
Valvoline
VVV
$3.96B
| $143K | ﹤0.01% |
+4,253
| New | +$147K |
2026 Q1
0 quarters
|
|
|
AWTM
4680
PUT
DELISTED
AWTM Ultra-Short Duration Enhanced Income ETF
AWTM
| $143K | ﹤0.01% |
6,000
-15,500
| -72% | -$370K |
2024 Q4
5 quarters
|
|
4681
PUT
Descartes Systems
DSGX
$6.93B
| $143K | ﹤0.01% |
2,000
+1,800
| +900% | +$133K |
2025 Q2
3 quarters
|
|
4682
CALL
Perion Network
PERI
$335M
| $143K | ﹤0.01% |
14,300
-24,600
| -63% | -$223K |
2019 Q3
26 quarters
|
|
4683
PUT
Fidelity Enhanced Large Cap Core ETF
FELC
$8.66B
| $143K | ﹤0.01% |
2,300
-1,100
| -32% | -$41.7K |
2023 Q4
9 quarters
|
|
4684
PUT
AtriCure
ATRC
$2.72B
| $143K | ﹤0.01% |
+5,000
| New | +$171K |
2026 Q1
0 quarters
|
|
4685
PUT
Bloomin' Brands
BLMN
$717M
| $143K | ﹤0.01% |
26,400
-7,400
| -22% | -$47.4K |
2018 Q2
31 quarters
|
|
|
CRESY
4686
CALL
Cresud
CRESY
$800M
| $142K | ﹤0.01% |
+11,200
| New | +$136K |
2026 Q1
0 quarters
|
|
4687
Bankunited
BKU
$3.08B
| $142K | ﹤0.01% |
3,152
+3,146
| +52,433% | +$147K |
2025 Q4
1 quarter
|
|
4688
Baker Hughes
BKR
$55.8B
| $142K | ﹤0.01% |
+2,331
| New | +$135K |
2026 Q1
0 quarters
|
|
|
UPB
4689
PUT
Upstream Bio Inc
UPB
$274M
| $142K | ﹤0.01% |
15,800
+11,300
| +251% | +$203K |
2025 Q3
2 quarters
|
|
4690
PUT
Establishment Labs
ESTA
$1.87B
| $142K | ﹤0.01% |
+2,500
| New | +$171K |
2026 Q1
0 quarters
|
|
4691
Roblox
RBLX
$30.5B
| $142K | ﹤0.01% |
2,504
-17,129
| -87% | -$1.15M |
2025 Q3
2 quarters
|
|
4692
CALL
Veralto
VLTO
$23.1B
| $141K | ﹤0.01% |
1,600
| – | – |
2023 Q4
9 quarters
|
|
4693
PUT
Bio-Techne
TECH
$11.4B
| $141K | ﹤0.01% |
2,700
-16,100
| -86% | -$966K |
2021 Q1
20 quarters
|
|
4694
CALL
Seres Therapeutics
MCRB
$29.6M
| $141K | ﹤0.01% |
15,900
-48,300
| -75% | -$566K |
2020 Q1
24 quarters
|
|
4695
PUT
Buckle
BKE
$2.21B
| $141K | ﹤0.01% |
2,800
-3,000
| -52% | -$155K |
2016 Q2
39 quarters
|
|
|
AVB
4696
DELISTED
AvalonBay Communities
AVB
| $141K | ﹤0.01% |
+863
| New | +$151K |
2026 Q1
0 quarters
|
|
4697
PUT
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$244M
| $141K | ﹤0.01% |
1,500
+900
| +150% | +$61.6K |
2018 Q1
32 quarters
|
|
4698
CALL
Bakkt Inc
BKKT
$349M
| $141K | ﹤0.01% |
19,100
-879,200
| -98% | -$10.4M |
2025 Q3
2 quarters
|
|
4699
Itaú Unibanco
ITUB
$90.6B
| $140K | ﹤0.01% |
16,763
-97,285
| -85% | -$814K |
2025 Q4
1 quarter
|
|
4700
A2Z Smart Technologies
AZ
$258M
| $140K | ﹤0.01% |
+21,046
| New | +$134K |
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.