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 | |
|---|---|---|---|---|---|---|
6851
CALL
Carriage Services
CSV
$505M
| $18.3K | ﹤0.01% |
400
+200
| +100% | +$8.7K |
|
|
TSYY
6852
GraniteShares YieldBOOST TSLA ETF
TSYY
$57.7M
| $18.2K | ﹤0.01% |
657
-303
| -32% | -$10.6K |
|
|
QMFE
6853
CALL
FT Vest Nasdaq-100 Moderate Buffer ETF - February
QMFE
$44.9M
| $18.2K | ﹤0.01% |
+1,100
| New | +$24.7K |
|
6854
AC Immune
ACIU
$279M
| $18.2K | ﹤0.01% |
+6,620
| New | +$20.6K |
|
6855
Cleveland-Cliffs
CLF
$6.54B
| $18.2K | ﹤0.01% |
2,151
-351,819
| -99% | -$4.03M |
|
6856
CALL
Spire
SR
$4.52B
| $18.1K | ﹤0.01% |
200
-1,000
| -83% | -$87.8K |
|
6857
SiteOne Landscape Supply
SITE
$3.91B
| $18.1K | ﹤0.01% |
+136
| New | +$19.2K |
|
6858
CALL
Tetra Tech
TTEK
$8.63B
| $18.1K | ﹤0.01% |
600
-5,600
| -90% | -$198K |
|
6859
SAB Biotherapeutics
SABS
$278M
| $18.1K | ﹤0.01% |
+4,713
| New | +$18.8K |
|
|
EHAB
6860
DELISTED
Enhabit
EHAB
| $18K | ﹤0.01% |
1,281
-6,834
| -84% | -$81.8K |
|
6861
CALL
Savara
SVRA
$1.04B
| $18K | ﹤0.01% |
3,300
+1,300
| +65% | +$7.24K |
|
6862
CALL
Newmark Group
NMRK
$2.29B
| $18K | ﹤0.01% |
1,200
+900
| +300% | +$14.2K |
|
6863
Butterfly Network
BFLY
$2.27B
| $18K | ﹤0.01% |
4,445
-30,980
| -87% | -$120K |
|
6864
CALL
HUTCHMED
HCM
$2.53B
| $18K | ﹤0.01% |
1,200
+200
| +20% | +$2.92K |
|
6865
CALL
Ceco Environmental
CECO
$4.21B
| $17.9K | ﹤0.01% |
300
+100
| +50% | +$6.43K |
|
6866
CALL
Oppenheimer Holdings
OPY
$1.28B
| $17.8K | ﹤0.01% |
200
+100
| +100% | +$8.37K |
|
|
NTSK
6867
PUT
Netskope Inc
NTSK
$7.29B
| $17.8K | ﹤0.01% |
2,100
-3,000
| -59% | -$37.2K |
|
|
GCPU
6868
CALL
Grayscale AI Compute ETF
GCPU
$11.4M
| $17.8K | ﹤0.01% |
700
| – | – |
|
6869
Douglas Dynamics
PLOW
$916M
| $17.8K | ﹤0.01% |
423
-1,818
| -81% | -$73.4K |
|
|
VMRK
6870
CALL
Vivmark Residential
VMRK
$46.6B
| $17.7K | ﹤0.01% |
300
+100
| +50% | +$6.17K |
|
6871
PUT
Amplitude
AMPL
$1.79B
| $17.7K | ﹤0.01% |
2,600
+1,000
| +63% | +$8.25K |
|
6872
PUT
Pampa Energía
PAM
$4.08B
| $17.7K | ﹤0.01% |
200
-9,200
| -98% | -$763K |
|
6873
CALL
Frontier Group Holdings
ULCC
$1.37B
| $17.6K | ﹤0.01% |
5,000
-127,600
| -96% | -$583K |
|
6874
PUT
Riskified
RSKD
$1.05B
| $17.6K | ﹤0.01% |
4,500
+2,500
| +125% | +$11.1K |
|
|
MREO
6875
PUT
Mereo BioPharma
MREO
$58.6M
| $17.6K | ﹤0.01% |
53,400
-533,000
| -91% | -$229K |
|
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.