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 | |
|---|---|---|---|---|---|---|
5601
CALL
Denali Therapeutics
DNLI
$3.56B
| $95.2K | ﹤0.01% |
+3,700
| New | +$76K |
|
5602
PUT
Euronet Worldwide
EEFT
$2.76B
| $95.1K | ﹤0.01% |
+1,300
| New | +$90.7K |
|
|
SPYM
5603
State Street SPDR Portfolio S&P 500 ETF
SPYM
$170B
| $95.1K | ﹤0.01% |
1,082
-15,387
| -93% | -$1.31M |
|
5604
CALL
Anavex Life Sciences
AVXL
$265M
| $95.1K | ﹤0.01% |
36,700
-42,200
| -53% | -$125K |
|
|
GRMN
5605
PUT
Garmin
GRMN
$53.4B
| $95K | ﹤0.01% |
400
-20,900
| -98% | -$5.08M |
|
5606
Byrna Technologies
BYRN
$86.1M
| $94.8K | ﹤0.01% |
14,134
+12,473
| +751% | +$76.6K |
|
5607
CALL
NeoVolta
NEOV
$227M
| $94.8K | ﹤0.01% |
+30,100
| New | +$76.3K |
|
5608
Intellicheck
IDN
$56.5M
| $94.7K | ﹤0.01% |
23,108
+17,749
| +331% | +$106K |
|
5609
Emcor
EME
$33.3B
| $94.6K | ﹤0.01% |
114
-870
| -88% | -$736K |
|
|
MESO
5610
Mesoblast
MESO
$2.25B
| $94.3K | ﹤0.01% |
+6,971
| New | +$104K |
|
5611
VanEck JP Morgan EM Local Currency Bond ETF
EMLC
$5.11B
| $94.3K | ﹤0.01% |
+3,690
| New | +$94.2K |
|
5612
Alpha Pro Tech
APT
$54.7M
| $94.3K | ﹤0.01% |
+16,772
| New | +$87.7K |
|
5613
PUT
Schrodinger
SDGR
$1.5B
| $94.3K | ﹤0.01% |
5,800
+4,800
| +480% | +$64.2K |
|
5614
CALL
Terex
TEX
$7.23B
| $94.1K | ﹤0.01% |
1,300
+600
| +86% | +$37.5K |
|
|
TONX
5615
PUT
TON Strategy Co
TONX
$183M
| $94.1K | ﹤0.01% |
+36,900
| New | +$109K |
|
5616
ProShares Trust UltraShort Lehman 7-10 Year Treasury
PST
$10.7M
| $94.1K | ﹤0.01% |
4,134
-3,345
| -45% | -$76.2K |
|
5617
CALL
Lakeland Industries
LAKE
$118M
| $94.1K | ﹤0.01% |
8,800
+2,900
| +49% | +$29.3K |
|
5618
PUT
MINISO
MNSO
$2.86B
| $94.1K | ﹤0.01% |
7,800
-2,900
| -27% | -$40.8K |
|
5619
Inter&Co
INTR
$2.5B
| $94.1K | ﹤0.01% |
+17,321
| New | +$116K |
|
5620
PUT
Columbus McKinnon
CMCO
$544M
| $93.8K | ﹤0.01% |
6,200
+1,800
| +41% | +$26.8K |
|
|
DCH
5621
PUT
Dauch Corp
DCH
$1.66B
| $93.8K | ﹤0.01% |
17,300
-25,900
| -60% | -$157K |
|
5622
CALL
ReNew
RNW
$2.5B
| $93.8K | ﹤0.01% |
15,000
-19,900
| -57% | -$112K |
|
5623
PUT
Humacyte
HUMA
$168M
| $93.7K | ﹤0.01% |
120,100
+62,200
| +107% | +$57.6K |
|
5624
CALL
Mirum Pharmaceuticals
MIRM
$6.15B
| $93.7K | ﹤0.01% |
800
+100
| +14% | +$10K |
|
5625
CALL
PagerDuty
PD
$1.07B
| $93.6K | ﹤0.01% |
9,700
+5,700
| +143% | +$43.1K |
|
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.