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 | |
|---|---|---|---|---|---|---|
|
MZTI
7576
PUT
The Marzetti Company
MZTI
$2.88B
| $11.4K | ﹤0.01% |
+100
| New | +$12K |
|
|
DFSV
7577
Dimensional US Small Cap Value ETF
DFSV
$8.46B
| $11.4K | ﹤0.01% |
294
+272
| +1,236% | +$10.2K |
|
7578
Goldgroup Mining
GORO
$563M
| $11.4K | ﹤0.01% |
+9,024
| New | +$12.3K |
|
7579
PUT
Inseego
INSG
$69.6M
| $11.4K | ﹤0.01% |
1,100
-6,800
| -86% | -$91.1K |
|
7580
Community Trust Bancorp
CTBI
$1.41B
| $11.4K | ﹤0.01% |
157
+138
| +726% | +$9.19K |
|
|
TXNM
7581
CALL
TXNM Energy Inc
TXNM
$5.98B
| $11.4K | ﹤0.01% |
200
+100
| +100% | +$5.87K |
|
7582
PUT
Innoviva
INVA
$1.54B
| $11.4K | ﹤0.01% |
+500
| New | +$11.4K |
|
7583
PUT
Westrock Coffee
WEST
$757M
| $11.4K | ﹤0.01% |
1,400
+1,200
| +600% | +$8.61K |
|
7584
Maximus
MMS
$3.02B
| $11.3K | ﹤0.01% |
211
-625
| -75% | -$39K |
|
7585
PUT
Sylvamo
SLVM
$1.43B
| $11.3K | ﹤0.01% |
300
| – | – |
|
|
7586
CALL
Sylvamo
SLVM
$1.43B
| $11.3K | ﹤0.01% |
300
-400
| -57% | -$16.2K |
|
7587
Hippo Holdings
HIPO
$894M
| $11.3K | ﹤0.01% |
401
-1,200
| -75% | -$31.9K |
|
7588
PUT
Cadiz
CDZI
$353M
| $11.3K | ﹤0.01% |
2,700
| – | – |
|
|
ETHW
7589
PUT
Bitwise Ethereum ETF
ETHW
$261M
| $11.3K | ﹤0.01% |
1,000
+700
| +233% | +$10.3K |
|
7590
Direxion Daily Industrials Bull 3X ETF
DUSL
$47.2M
| $11.2K | ﹤0.01% |
107
-348
| -76% | -$30.8K |
|
|
SII
7591
PUT
Sprott
SII
$3.33B
| $11.2K | ﹤0.01% |
100
-5,700
| -98% | -$746K |
|
|
SJT
7592
CALL
San Juan Basin Royalty Trust
SJT
$138M
| $11.2K | ﹤0.01% |
+3,500
| New | +$14.1K |
|
7593
Mammoth Energy Services
TUSK
$150M
| $11.2K | ﹤0.01% |
3,457
-2,081
| -38% | -$6.09K |
|
|
ELME
7594
PUT
Elme Communities
ELME
$150M
| $11.2K | ﹤0.01% |
8,300
| – | – |
|
|
HIYY
7595
YieldMax HIMS Option Income Strategy ETF
HIYY
$10.8M
| $11.2K | ﹤0.01% |
+672
| New | +$10.2K |
|
7596
Usana Health Sciences
USNA
$276M
| $11.2K | ﹤0.01% |
524
-163
| -24% | -$3.06K |
|
7597
CALL
Interparfums
IPAR
$3.74B
| $11.2K | ﹤0.01% |
+100
| New | +$9.43K |
|
7598
CALL
ALX Oncology
ALXO
$278M
| $11.2K | ﹤0.01% |
5,400
| – | – |
|
7599
PUT
Lantronix
LTRX
$244M
| $11.2K | ﹤0.01% |
+1,900
| New | +$12.2K |
|
7600
CALL
Saratoga Investment
SAR
$284M
| $11.2K | ﹤0.01% |
+500
| New | +$11.2K |
|
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.