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 | |
|---|---|---|---|---|---|---|---|
4876
CALL
SiteOne Landscape Supply
SITE
$3.91B
| $120K | ﹤0.01% |
+900
| New | +$127K |
2026 Q1
0 quarters
|
|
4877
CALL
KB Financial Group
KB
$43.5B
| $120K | ﹤0.01% |
1,200
+600
| +100% | +$60.3K |
2025 Q2
3 quarters
|
|
4878
PUT
AMC Entertainment Holdings
AMC
$2.46B
| $120K | ﹤0.01% |
122,100
-269,000
| -69% | -$346K |
2021 Q2
19 quarters
|
|
|
HIMX
4879
PUT
Himax Technologies
HIMX
$2.66B
| $120K | ﹤0.01% |
15,200
-68,500
| -82% | -$562K |
2021 Q2
19 quarters
|
|
|
NB
4880
PUT
NioCorp Developments
NB
$508M
| $120K | ﹤0.01% |
26,800
+9,800
| +58% | +$56.2K |
2025 Q1
4 quarters
|
|
4881
CALL
Palomar
PLMR
$3.33B
| $120K | ﹤0.01% |
1,000
+800
| +400% | +$99.8K |
2024 Q4
5 quarters
|
|
4882
Upbound Group
UPBD
$928M
| $119K | ﹤0.01% |
6,609
+1,894
| +40% | +$36.9K |
2025 Q3
2 quarters
|
|
|
WLAC
4883
CALL
DELISTED
Willow Lane Acquisition Corp
WLAC
| $119K | ﹤0.01% |
+11,200
| New | +$127K |
2026 Q1
0 quarters
|
|
4884
CALL
Blue Bird Corp
BLBD
$1.79B
| $119K | ﹤0.01% |
2,100
+1,600
| +320% | +$86.3K |
2023 Q1
12 quarters
|
|
4885
PUT
F&G Annuities & Life
FG
$2.87B
| $119K | ﹤0.01% |
4,700
+1,100
| +31% | +$28.7K |
2025 Q1
4 quarters
|
|
4886
CALL
Associated Banc-Corp
ASB
$5.48B
| $119K | ﹤0.01% |
4,600
-2,700
| -37% | -$71.7K |
2018 Q4
29 quarters
|
|
4887
Planet Labs
PL
$6.37B
| $119K | ﹤0.01% |
+4,254
| New | +$109K |
2026 Q1
0 quarters
|
|
4888
PUT
Bank of Hawaii
BOH
$2.73B
| $119K | ﹤0.01% |
1,600
+1,300
| +433% | +$96.7K |
2022 Q4
13 quarters
|
|
|
NTST
4889
PUT
NETSTREIT Corp
NTST
$1.78B
| $119K | ﹤0.01% |
+6,300
| New | +$121K |
2026 Q1
0 quarters
|
|
4890
PUT
Grocery Outlet
GO
$1.15B
| $118K | ﹤0.01% |
16,800
+4,500
| +37% | +$39.1K |
2021 Q1
20 quarters
|
|
4891
CALL
Kulicke & Soffa
KLIC
$5.27B
| $118K | ﹤0.01% |
1,800
-5,400
| -75% | -$343K |
2015 Q4
41 quarters
|
|
|
ECG
4892
PUT
Everus Construction Group
ECG
$6.3B
| $118K | ﹤0.01% |
+1,000
| New | +$103K |
2026 Q1
0 quarters
|
|
4893
PUT
Unusual Machines
UMAC
$1.12B
| $118K | ﹤0.01% |
9,500
-900
| -9% | -$13.7K |
2025 Q1
4 quarters
|
|
4894
PUT
Winnebago Industries
WGO
$743M
| $118K | ﹤0.01% |
3,800
-6,600
| -63% | -$275K |
2016 Q2
39 quarters
|
|
4895
CALL
SEI Investments
SEIC
$12.3B
| $118K | ﹤0.01% |
+1,500
| New | +$124K |
2026 Q1
0 quarters
|
|
4896
PUT
NCR Atleos
NATL
$3.36B
| $118K | ﹤0.01% |
+2,700
| New | +$112K |
2026 Q1
0 quarters
|
|
|
NAGE
4897
Niagen Bioscience
NAGE
$222M
| $118K | ﹤0.01% |
26,677
+2,015
| +8% | +$10.9K |
2025 Q3
2 quarters
|
|
4898
Cracker Barrel
CBRL
$1.25B
| $118K | ﹤0.01% |
+4,183
| New | +$127K |
2026 Q1
0 quarters
|
|
4899
PUT
Solventum
SOLV
$15B
| $118K | ﹤0.01% |
1,800
+1,000
| +125% | +$74.3K |
2024 Q2
7 quarters
|
|
4900
PUT
Krispy Kreme
DNUT
$503M
| $117K | ﹤0.01% |
34,600
+13,900
| +67% | +$48K |
2021 Q4
17 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.