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 | |
|---|---|---|---|---|---|---|
3276
Synaptics
SYNA
$3.98B
| $658K | ﹤0.01% |
+5,294
| New | +$598K |
|
3277
Universal Technical Institute
UTI
$1.02B
| $657K | ﹤0.01% |
15,370
-2,567
| -14% | -$98.7K |
|
3278
PUT
Dycom Industries
DY
$8.05B
| $657K | ﹤0.01% |
1,300
+1,100
| +550% | +$481K |
|
3279
Cummins
CMI
$71.3B
| $657K | ﹤0.01% |
+921
| New | +$607K |
|
3280
CALL
Vital Farms
VITL
$415M
| $656K | ﹤0.01% |
56,400
+47,700
| +548% | +$532K |
|
3281
CALL
Cracker Barrel
CBRL
$1.2B
| $656K | ﹤0.01% |
12,300
-1,700
| -12% | -$58.9K |
|
3282
Columbia Financial
CLBK
$1.13B
| $656K | ﹤0.01% |
+67,965
| New | +$600K |
|
3283
PUT
Rithm Capital
RITM
$5.07B
| $655K | ﹤0.01% |
69,800
-500
| -0.7% | -$4.77K |
|
|
FDRS
3284
CALL
Founder-Led ETF
FDRS
$86.3M
| $655K | ﹤0.01% |
+20,600
| New | +$471K |
|
3285
Harrow
HROW
$1.18B
| $652K | ﹤0.01% |
15,349
-4,259
| -22% | -$158K |
|
3286
CALL
Academy Sports + Outdoors
ASO
$2.99B
| $650K | ﹤0.01% |
13,800
+4,600
| +50% | +$245K |
|
3287
PUT
Annexon
ANNX
$760M
| $650K | ﹤0.01% |
113,900
+88,000
| +340% | +$486K |
|
3288
CALL
International Flavors & Fragrances
IFF
$21.9B
| $650K | ﹤0.01% |
8,200
-3,700
| -31% | -$275K |
|
3289
CALL
Regenxbio
RGNX
$493M
| $648K | ﹤0.01% |
54,100
+36,400
| +206% | +$302K |
|
3290
CALL
Blue Owl Capital
OBDC
$5.31B
| $648K | ﹤0.01% |
59,600
+2,500
| +4% | +$28K |
|
3291
PUT
Kinetik
KNTK
$4.12B
| $648K | ﹤0.01% |
13,400
-1,200
| -8% | -$57.3K |
|
|
UNIT
3292
Uniti Group
UNIT
$2.1B
| $647K | ﹤0.01% |
56,421
-175,545
| -76% | -$1.99M |
|
3293
State Street SPDR S&P Bank ETF
KBE
$1.5B
| $647K | ﹤0.01% |
9,479
-3,237
| -25% | -$207K |
|
3294
FMC
FMC
$1.43B
| $646K | ﹤0.01% |
56,204
-60,277
| -52% | -$841K |
|
3295
CALL
DaVita
DVA
$11.4B
| $645K | ﹤0.01% |
2,900
+500
| +21% | +$90.9K |
|
3296
CALL
Jackson Financial
JXN
$8.93B
| $645K | ﹤0.01% |
6,300
+3,300
| +110% | +$358K |
|
|
NB
3297
CALL
NioCorp Developments
NB
$505M
| $643K | ﹤0.01% |
133,500
-63,100
| -32% | -$345K |
|
3298
Global X US Infrastructure Development ETF
PAVE
$13.4B
| $642K | ﹤0.01% |
+10,904
| New | +$612K |
|
3299
PACS Group
PACS
$6.82B
| $642K | ﹤0.01% |
15,065
-55,655
| -79% | -$2M |
|
3300
S&P Global
SPGI
$117B
| $641K | ﹤0.01% |
+1,575
| New | +$665K |
|
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.