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 | |
|---|---|---|---|---|---|---|
3251
CALL
Ichor Holdings
ICHR
$2.23B
| $674K | ﹤0.01% |
6,000
+1,900
| +46% | +$137K |
|
3252
CALL
MeiraGTx Holdings
MGTX
$1.07B
| $673K | ﹤0.01% |
49,800
+40,600
| +441% | +$403K |
|
3253
Kymera Therapeutics
KYMR
$9.32B
| $673K | ﹤0.01% |
+5,867
| New | +$504K |
|
3254
CALL
Bloomin' Brands
BLMN
$678M
| $672K | ﹤0.01% |
73,500
-23,200
| -24% | -$169K |
|
3255
PUT
Old Dominion Freight Line
ODFL
$36.7B
| $671K | ﹤0.01% |
3,100
-10,100
| -77% | -$2.18M |
|
3256
KraneShares China Technology & Semiconductor STAR 50 Index ETF
KSTR
$388M
| $670K | ﹤0.01% |
20,711
+20,148
| +3,579% | +$480K |
|
|
ADUR
3257
PUT
Aduro Clean Technologies
ADUR
$440M
| $670K | ﹤0.01% |
42,500
+400
| +1% | +$5.43K |
|
3258
CALL
Organon & Co
OGN
$3.61B
| $669K | ﹤0.01% |
49,400
-176,100
| -78% | -$2.11M |
|
3259
PUT
Indivior Pharmaceuticals
INDV
$4.36B
| $669K | ﹤0.01% |
16,300
+2,900
| +22% | +$105K |
|
3260
Direxion Daily Energy Bull 2X ETF
ERX
$237M
| $668K | ﹤0.01% |
8,770
-9,639
| -52% | -$854K |
|
3261
Gates Industrial Corp
GTES
$6.75B
| $667K | ﹤0.01% |
23,863
+9,568
| +67% | +$246K |
|
|
TBPH
3262
PUT
DELISTED
Theravance Biopharma
TBPH
| $666K | ﹤0.01% |
39,200
-5,100
| -12% | -$84.4K |
|
|
AISP
3263
CALL
Airship AI Holdings
AISP
$62M
| $666K | ﹤0.01% |
278,700
+166,700
| +149% | +$425K |
|
3264
CALL
TransDigm Group
TDG
$61.3B
| $666K | ﹤0.01% |
500
-200
| -29% | -$246K |
|
|
LRCU
3265
Tradr 2X Long LRCX Daily ETF
LRCU
$40.8M
| $665K | ﹤0.01% |
+5,954
| New | +$360K |
|
3266
PUT
Guidewire Software
GWRE
$11.9B
| $664K | ﹤0.01% |
5,400
-2,300
| -30% | -$307K |
|
3267
Williams Companies
WMB
$84.4B
| $664K | ﹤0.01% |
+8,934
| New | +$657K |
|
3268
PUT
Ingersoll Rand
IR
$29.6B
| $664K | ﹤0.01% |
8,100
+8,000
| +8,000% | +$619K |
|
3269
VanEck BDC Income ETF
BIZD
$1.55B
| $663K | ﹤0.01% |
+52,358
| New | +$663K |
|
3270
CALL
Methode Electronics
MEI
$502M
| $662K | ﹤0.01% |
34,900
+31,900
| +1,063% | +$330K |
|
3271
CALL
ICU Medical
ICUI
$4.1B
| $660K | ﹤0.01% |
+4,500
| New | +$587K |
|
|
ZENA
3272
CALL
ZenaTech Inc
ZENA
$124M
| $659K | ﹤0.01% |
439,000
+427,300
| +3,652% | +$766K |
|
3273
Upstart Holdings
UPST
$2.24B
| $658K | ﹤0.01% |
+18,575
| New | +$572K |
|
3274
Viking Holdings
VIK
$35.4B
| $658K | ﹤0.01% |
6,285
-4,121
| -40% | -$357K |
|
3275
Mid-America Apartment Communities
MAA
$13.7B
| $658K | ﹤0.01% |
4,734
+1,556
| +49% | +$203K |
|
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.