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 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
301
PUT
Blackstone
BX
$88.9B
| $37M | 0.02% |
314,200
-53,400
| -15% | -$6.42M |
|
302
Direxion Daily Semiconductor Bull 3X ETF
SOXL
$26.6B
| $36.8M | 0.02% |
+138,147
| New | +$23.3M |
|
303
CALL
Home Depot
HD
$293B
| $36.6M | 0.02% |
103,900
+29,900
| +40% | +$9.73M |
|
304
CALL
AT&T
T
$174B
| $36.1M | 0.02% |
1,745,200
+383,400
| +28% | +$9.52M |
|
305
CALL
Cipher Digital
CIFR
$7.36B
| $36.1M | 0.02% |
1,472,500
-127,600
| -8% | -$2.69M |
|
|
SCIU
306
PUT
DELISTED
Global X Scientific Beta US ETF
SCIU
| $35.8M | 0.02% |
720,100
-109,600
| -13% | -$5.45M |
|
307
CALL
Marathon Digital Holdings
MARA
$4.85B
| $35.6M | 0.02% |
2,565,300
-220,100
| -8% | -$2.75M |
|
|
308
PUT
Cipher Digital
CIFR
$7.36B
| $35.6M | 0.02% |
1,454,300
+40,000
| +3% | +$844K |
|
309
PUT
Adobe
ADBE
$93.6B
| $35.6M | 0.02% |
173,600
+43,600
| +34% | +$10.3M |
|
310
PUT
AbbVie
ABBV
$467B
| $35.6M | 0.02% |
141,300
+25,000
| +21% | +$5.38M |
|
311
CALL
Comcast
CMCSA
$77.8B
| $35.4M | 0.02% |
1,440,900
+1,150,900
| +397% | +$29.7M |
|
312
CALL
Constellation Energy
CEG
$93.3B
| $35.4M | 0.02% |
142,400
+53,900
| +61% | +$15.2M |
|
|
ETHA
313
PUT
iShares Ethereum Trust ETF
ETHA
$9.5B
| $35.1M | 0.02% |
2,954,400
+374,700
| +15% | +$5.82M |
|
314
PUT
Cloudflare
NET
$124B
| $35.1M | 0.02% |
142,900
-1,200
| -0.8% | -$263K |
|
315
CALL
Take-Two Interactive
TTWO
$37.7B
| $35M | 0.02% |
140,200
+71,100
| +103% | +$15.7M |
|
316
CALL
Accenture
ACN
$108B
| $34.9M | 0.02% |
280,800
+165,600
| +144% | +$28.7M |
|
317
CALL
ProShares Ultra Bloomberg Natural Gas
BOIL
$442M
| $34.8M | 0.02% |
1,149,400
+213,950
| +23% | +$5.87M |
|
318
PUT
Vistra
VST
$46.5B
| $34.7M | 0.02% |
218,700
+57,100
| +35% | +$8.86M |
|
319
CALL
Rivian
RIVN
$22.4B
| $34.2M | 0.02% |
1,972,900
-469,900
| -19% | -$7.33M |
|
320
PUT
Occidental Petroleum
OXY
$56.8B
| $34.2M | 0.02% |
704,400
-75,300
| -10% | -$4.28M |
|
321
PUT
GraniteShares Bloomberg Commodity Broad Strategy No K-1 ETF
COMB
$162M
| $34.1M | 0.02% |
994,400
+589,600
| +146% | +$15.4M |
|
322
PUT
Mastercard
MA
$497B
| $34.1M | 0.02% |
66,400
+200
| +0.3% | +$99.7K |
|
|
323
Meta Platforms (Facebook)
META
$1.91T
| $34M | 0.02% |
60,293
-169,560
| -74% | -$104M |
|
324
PUT
United Parcel Service
UPS
$79.9B
| $33.8M | 0.02% |
314,100
-97,300
| -24% | -$10.1M |
|
325
CALL
Morgan Stanley
MS
$308B
| $33.7M | 0.02% |
161,400
-69,800
| -30% | -$13.8M |
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.