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 | |
|---|---|---|---|---|---|---|
|
NVA
7351
CALL
Nova Minerals Corp
NVA
$234M
| $15.1K | ﹤0.01% |
3,200
+900
| +39% | +$5.45K |
|
|
TECX
7352
Tectonic Therapeutic
TECX
$601M
| $15.1K | ﹤0.01% |
439
-912
| -68% | -$26.8K |
|
|
VGMS
7353
CALL
Vanguard Multi-Sector Income Bond ETF
VGMS
$249M
| $15.1K | ﹤0.01% |
+300
| New | +$15.4K |
|
|
ARDT
7354
Ardent Health
ARDT
$1.54B
| $15K | ﹤0.01% |
1,527
-1,732
| -53% | -$16.4K |
|
7355
PUT
NWPX Infrastructure Inc
NWPX
$1.04B
| $15K | ﹤0.01% |
+100
| New | +$10.9K |
|
7356
PUT
TIM SA
TIMB
$8.76B
| $15K | ﹤0.01% |
700
+100
| +17% | +$2.38K |
|
7357
CALL
i3 Verticals
IIIV
$299M
| $15K | ﹤0.01% |
+700
| New | +$14.6K |
|
7358
PUT
SGHC Ltd
SGHC
$7.11B
| $14.9K | ﹤0.01% |
1,100
-86,500
| -99% | -$1.1M |
|
7359
YieldMax Universe Fund of Option Income ETFs
YMAX
$388M
| $14.9K | ﹤0.01% |
1,842
-3,010
| -62% | -$24.9K |
|
7360
CALL
RF Industries
RFIL
$114M
| $14.8K | ﹤0.01% |
700
-800
| -53% | -$12.9K |
|
|
SHOE
7361
PUT
Shoe Station Group
SHOE
$382M
| $14.8K | ﹤0.01% |
1,000
-500
| -33% | -$8.54K |
|
7362
Heartland Express
HTLD
$962M
| $14.8K | ﹤0.01% |
+973
| New | +$13.2K |
|
7363
CALL
Sensus Healthcare
SRTS
$52.5M
| $14.8K | ﹤0.01% |
4,900
| – | – |
|
7364
PUT
Minerals Technologies
MTX
$2.23B
| $14.8K | ﹤0.01% |
+200
| New | +$15.1K |
|
7365
Cinemark Holdings
CNK
$4.06B
| $14.8K | ﹤0.01% |
+466
| New | +$13.8K |
|
7366
Prenetics Global
PRE
$427M
| $14.8K | ﹤0.01% |
773
+417
| +117% | +$7.71K |
|
7367
PUT
Gaotu Techedu
GOTU
$517M
| $14.8K | ﹤0.01% |
8,900
+100
| +1% | +$182 |
|
7368
Vertical Aerospace
EVTL
$103M
| $14.8K | ﹤0.01% |
+8,489
| New | +$20.4K |
|
7369
CALL
PolyPid
PYPD
$109M
| $14.7K | ﹤0.01% |
2,900
+2,000
| +222% | +$9.22K |
|
7370
SFL Corp
SFL
$1.78B
| $14.7K | ﹤0.01% |
+1,442
| New | +$16.4K |
|
7371
CALL
The Greenbrier Companies
GBX
$1.34B
| $14.7K | ﹤0.01% |
300
-800
| -73% | -$39.3K |
|
7372
PUT
DT Midstream
DTM
$13.2B
| $14.7K | ﹤0.01% |
+100
| New | +$14.1K |
|
7373
CALL
Simply Good Foods
SMPL
$1.01B
| $14.6K | ﹤0.01% |
1,100
-12,100
| -92% | -$149K |
|
7374
CALL
Rush Enterprises Class A
RUSHA
$5.95B
| $14.6K | ﹤0.01% |
+300
| New | +$14.1K |
|
|
SOGP
7375
PUT
Sound Group
SOGP
$49.9M
| $14.6K | ﹤0.01% |
1,300
-7,000
| -84% | -$98.7K |
|
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.