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 | |
|---|---|---|---|---|---|---|---|
4301
CALL
Gladstone Capital
GLAD
$439M
| $200K | ﹤0.01% |
11,500
+11,400
| +11,400% | +$218K |
2019 Q2
27 quarters
|
|
|
LX
4302
LexinFintech Holdings
LX
$116M
| $199K | ﹤0.01% |
+91,493
| New | +$257K |
2026 Q1
0 quarters
|
|
|
KALV
4303
CALL
DELISTED
KalVista Pharmaceuticals
KALV
| $199K | ﹤0.01% |
+9,900
| New | +$160K |
2026 Q1
0 quarters
|
|
4304
PUT
HDFC Bank
HDB
$118B
| $199K | ﹤0.01% |
8,000
+100
| +1% | +$3.11K |
2016 Q3
38 quarters
|
|
4305
CALL
Replimune Group
REPL
$1.27B
| $199K | ﹤0.01% |
26,000
-13,800
| -35% | -$105K |
2022 Q2
15 quarters
|
|
4306
CALL
Inovio Pharmaceuticals
INO
$125M
| $199K | ﹤0.01% |
114,300
-148,600
| -57% | -$245K |
2021 Q2
19 quarters
|
|
4307
CALL
Unicycive Therapeutics
UNCY
$127M
| $199K | ﹤0.01% |
30,200
+29,100
| +2,645% | +$191K |
2025 Q4
1 quarter
|
|
4308
PUT
Simmons First National
SFNC
$3.28B
| $198K | ﹤0.01% |
10,200
+9,200
| +920% | +$184K |
2025 Q1
4 quarters
|
|
|
SMCY
4309
YieldMax SMCI Option Income Strategy ETF
SMCY
$142M
| $198K | ﹤0.01% |
36,137
+30,731
| +568% | +$234K |
2024 Q4
5 quarters
|
|
4310
CALL
Candel Therapeutics
CADL
$777M
| $198K | ﹤0.01% |
40,400
-18,300
| -31% | -$99.6K |
2024 Q2
7 quarters
|
|
4311
ADT
ADT
$4.55B
| $198K | ﹤0.01% |
30,113
-25,868
| -46% | -$194K |
2025 Q4
1 quarter
|
|
4312
Wolfspeed
WOLF
$1.65B
| $198K | ﹤0.01% |
12,121
-22,933
| -65% | -$414K |
2025 Q2
3 quarters
|
|
4313
Kelly Services Class A
KELYA
$571M
| $198K | ﹤0.01% |
+22,333
| New | +$213K |
2026 Q1
0 quarters
|
|
4314
CALL
Energizer
ENR
$1.45B
| $197K | ﹤0.01% |
12,000
+5,700
| +90% | +$115K |
2017 Q3
34 quarters
|
|
4315
iShares MSCI Turkey ETF
TUR
$170M
| $197K | ﹤0.01% |
5,098
-33,071
| -87% | -$1.3M |
2025 Q4
1 quarter
|
|
|
NLOP
4316
PUT
Net Lease Office Properties
NLOP
$144M
| $197K | ﹤0.01% |
17,100
+8,100
| +90% | +$136K |
2025 Q2
3 quarters
|
|
4317
PUT
Ultragenyx Pharmaceutical
RARE
$1.45B
| $197K | ﹤0.01% |
+9,400
| New | +$212K |
2026 Q1
0 quarters
|
|
|
NSA
4318
DELISTED
National Storage Affiliates Trust
NSA
| $197K | ﹤0.01% |
+5,216
| New | +$176K |
2026 Q1
0 quarters
|
|
4319
Richardson Electronics
RELL
$276M
| $197K | ﹤0.01% |
17,975
+15,247
| +559% | +$178K |
2025 Q4
1 quarter
|
|
4320
Fluence Energy
FLNC
$1.08B
| $197K | ﹤0.01% |
14,302
-14,908
| -51% | -$299K |
2025 Q4
1 quarter
|
|
4321
CALL
Equitable Holdings
EQH
$14.2B
| $197K | ﹤0.01% |
5,300
+5,200
| +5,200% | +$223K |
2018 Q2
31 quarters
|
|
4322
PUT
Commercial Metals
CMC
$6.94B
| $197K | ﹤0.01% |
3,200
-1,700
| -35% | -$123K |
2019 Q3
26 quarters
|
|
4323
Clean Harbors
CLH
$16.5B
| $196K | ﹤0.01% |
685
+503
| +276% | +$137K |
2025 Q3
2 quarters
|
|
4324
CALL
Buckle
BKE
$2.2B
| $196K | ﹤0.01% |
3,900
+3,700
| +1,850% | +$192K |
2016 Q4
37 quarters
|
|
|
GOLD
4325
Gold.com Inc
GOLD
$1.23B
| $196K | ﹤0.01% |
4,899
-3,098
| -39% | -$151K |
2025 Q2
3 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.