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 | |
|---|---|---|---|---|---|---|
|
YSS
3576
PUT
York Space Systems
YSS
$1.26B
| $512K | ﹤0.01% |
20,800
+13,400
| +181% | +$416K |
|
3577
PUT
Fox Factory Holding Corp
FOXF
$788M
| $512K | ﹤0.01% |
30,200
+30,100
| +30,100% | +$524K |
|
3578
Star Bulk Carriers
SBLK
$3.4B
| $512K | ﹤0.01% |
20,489
-4,705
| -19% | -$122K |
|
3579
PUT
Republic Services
RSG
$65.2B
| $511K | ﹤0.01% |
2,400
-2,300
| -49% | -$481K |
|
3580
CALL
Arhaus
ARHS
$1.37B
| $511K | ﹤0.01% |
60,700
-11,200
| -16% | -$77.8K |
|
3581
PUT
OR Royalties Inc
OR
$6.42B
| $509K | ﹤0.01% |
16,100
+9,900
| +160% | +$365K |
|
3582
Algoma Steel
ASTL
$460M
| $509K | ﹤0.01% |
125,725
-29,180
| -19% | -$140K |
|
3583
Ares Management
ARES
$26.9B
| $509K | ﹤0.01% |
+4,571
| New | +$548K |
|
3584
Butterfly Network
BFLY
$2.44B
| $508K | ﹤0.01% |
60,366
+55,921
| +1,258% | +$289K |
|
3585
Zymeworks
ZYME
$1.94B
| $508K | ﹤0.01% |
19,431
+18,095
| +1,354% | +$460K |
|
3586
PUT
Fidelity Enhanced Large Cap Core ETF
FELC
$8.62B
| $508K | ﹤0.01% |
5,100
+2,800
| +122% | +$114K |
|
3587
Ooma
OOMA
$585M
| $505K | ﹤0.01% |
+26,257
| New | +$450K |
|
3588
CALL
Energy Recovery
ERII
$343M
| $504K | ﹤0.01% |
55,900
+55,500
| +13,875% | +$527K |
|
3589
CALL
Northern Trust
NTRS
$31.9B
| $504K | ﹤0.01% |
+2,900
| New | +$478K |
|
3590
CALL
Jacobs Solutions
J
$16.2B
| $504K | ﹤0.01% |
4,000
-600
| -13% | -$73.8K |
|
3591
PUT
TKO Group
TKO
$13.3B
| $503K | ﹤0.01% |
2,500
-2,600
| -51% | -$507K |
|
|
GTM
3592
PUT
ZoomInfo Technologies
GTM
$1.05B
| $503K | ﹤0.01% |
171,700
+157,900
| +1,144% | +$710K |
|
3593
A2Z Smart Technologies
AZ
$235M
| $503K | ﹤0.01% |
86,439
+65,393
| +311% | +$446K |
|
3594
Warby Parker
WRBY
$3.05B
| $503K | ﹤0.01% |
+16,579
| New | +$410K |
|
3595
Kratos Defense & Security Solutions
KTOS
$8.27B
| $503K | ﹤0.01% |
+10,083
| New | +$610K |
|
3596
CALL
Protagonist Therapeutics
PTGX
$9.22B
| $503K | ﹤0.01% |
4,100
-31,100
| -88% | -$3.25M |
|
3597
CALL
Arbe Robotics
ARBE
$76.4M
| $502K | ﹤0.01% |
605,100
+245,100
| +68% | +$212K |
|
3598
Red Cat Holdings
RCAT
$993M
| $502K | ﹤0.01% |
47,126
+4,878
| +12% | +$56.2K |
|
3599
CALL
Invesco CurrencyShares Swiss Franc Trust
FXF
$381M
| $502K | ﹤0.01% |
4,600
+1,800
| +64% | +$201K |
|
|
GTLS
3600
PUT
DELISTED
Chart Industries
GTLS
| $501K | ﹤0.01% |
2,400
-600
| -20% | -$125K |
|
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.