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 | |
|---|---|---|---|---|---|---|
|
ODVWW
4576
CALL
DELISTED
Osisko Development Corp. Warrant
ODVWW
| $222K | ﹤0.01% |
90,300
+12,500
| +16% | +$30.8K |
|
4577
CALL
Ventas
VTR
$44.6B
| $222K | ﹤0.01% |
2,500
-4,400
| -64% | -$375K |
|
4578
PUT
Aramark
ARMK
$14.4B
| $222K | ﹤0.01% |
3,900
-7,100
| -65% | -$350K |
|
4579
PUT
Cannae Holdings
CNNE
$673M
| $222K | ﹤0.01% |
15,400
-47,600
| -76% | -$647K |
|
4580
PUT
Editas Medicine
EDIT
$398M
| $222K | ﹤0.01% |
68,400
+33,600
| +97% | +$98.2K |
|
4581
Celanese
CE
$4.92B
| $222K | ﹤0.01% |
+4,816
| New | +$279K |
|
4582
PUT
Kanzhun
BZ
$6.2B
| $221K | ﹤0.01% |
17,200
+14,900
| +648% | +$204K |
|
4583
CALL
MediaAlpha
MAX
$497M
| $221K | ﹤0.01% |
17,600
+10,300
| +141% | +$97.2K |
|
|
SAIL
4584
CALL
SailPoint Inc
SAIL
$11.8B
| $221K | ﹤0.01% |
15,100
+5,800
| +62% | +$79K |
|
|
AEVA
4585
Aeva Technologies
AEVA
$974M
| $221K | ﹤0.01% |
7,695
+2,949
| +62% | +$58K |
|
4586
CBIZ
CBZ
$3B
| $221K | ﹤0.01% |
6,886
+199
| +3% | +$6.19K |
|
4587
KULR Technology Group
KULR
$116M
| $221K | ﹤0.01% |
+57,923
| New | +$193K |
|
4588
PUT
Old National Bancorp
ONB
$9.5B
| $220K | ﹤0.01% |
8,500
| – | – |
|
|
WBI
4589
WaterBridge Infrastructure LLC
WBI
$1.58B
| $220K | ﹤0.01% |
6,424
-4,744
| -42% | -$138K |
|
|
SOGP
4590
CALL
Sound Group
SOGP
$49.6M
| $220K | ﹤0.01% |
19,600
+18,800
| +2,350% | +$265K |
|
4591
Eversource Energy
ES
$24.1B
| $220K | ﹤0.01% |
+3,044
| New | +$211K |
|
4592
PUT
ING
ING
$103B
| $220K | ﹤0.01% |
7,000
-41,200
| -85% | -$1.22M |
|
4593
OneMain Financial
OMF
$6.48B
| $220K | ﹤0.01% |
3,602
-23,568
| -87% | -$1.33M |
|
4594
PUT
Atlanta Braves Holdings Series B
BATRK
$3.46B
| $220K | ﹤0.01% |
3,900
-5,400
| -58% | -$265K |
|
4595
Vaalco Energy
EGY
$593M
| $220K | ﹤0.01% |
43,218
+30,525
| +240% | +$176K |
|
|
HSAI
4596
Hesai Group
HSAI
$2.44B
| $220K | ﹤0.01% |
+12,049
| New | +$246K |
|
4597
PUT
State Street DoubleLine Short Duration Total Return Tactical ETF
STOT
$530M
| $220K | ﹤0.01% |
+7,500
| New | +$353K |
|
4598
PUT
Citizens
CIA
$183M
| $219K | ﹤0.01% |
+38,200
| New | +$207K |
|
4599
iShares Latin America 40 ETF
ILF
$3.8B
| $219K | ﹤0.01% |
6,495
-6,243
| -49% | -$221K |
|
4600
Brookdale Senior Living
BKD
$2.62B
| $219K | ﹤0.01% |
13,611
-87,587
| -87% | -$1.19M |
|
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.