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 | |
|---|---|---|---|---|---|---|
4776
iShares MSCI World ETF
URTH
$8.21B
| $190K | ﹤0.01% |
938
-2,071
| -69% | -$410K |
|
|
VNET
4777
CALL
VNET Group
VNET
$1.63B
| $190K | ﹤0.01% |
23,600
-57,300
| -71% | -$520K |
|
4778
CALL
Ligand Pharmaceuticals
LGND
$6.19B
| $190K | ﹤0.01% |
600
+100
| +20% | +$23.6K |
|
4779
Unicycive Therapeutics
UNCY
$127M
| $190K | ﹤0.01% |
40,422
+34,602
| +595% | +$255K |
|
4780
USA Compression Partners
USAC
$3.63B
| $190K | ﹤0.01% |
7,182
+5,039
| +235% | +$139K |
|
4781
CALL
CVR Partners
UAN
$1.31B
| $190K | ﹤0.01% |
1,700
-1,500
| -47% | -$184K |
|
4782
PUT
Sprout Social
SPT
$570M
| $190K | ﹤0.01% |
25,100
-1,600
| -6% | -$10.4K |
|
|
SKE
4783
CALL
Skeena Resources
SKE
$3.79B
| $189K | ﹤0.01% |
7,100
+1,400
| +25% | +$42.1K |
|
|
MNVT
4784
PUT
Moonvest ETF
MNVT
$70.1M
| $189K | ﹤0.01% |
5,200
+2,300
| +79% | +$65.7K |
|
4785
PUT
Wabtec
WAB
$49.2B
| $189K | ﹤0.01% |
700
+200
| +40% | +$52.9K |
|
|
MMED
4786
PUT
MiniMed Group Inc
MMED
$5.64B
| $188K | ﹤0.01% |
+12,600
| New | +$166K |
|
4787
CALL
Revolve Group
RVLV
$1.51B
| $188K | ﹤0.01% |
8,200
+7,900
| +2,633% | +$175K |
|
|
LGN
4788
CALL
Legence Corp
LGN
$4.13B
| $188K | ﹤0.01% |
2,200
+1,400
| +175% | +$114K |
|
4789
CALL
Nomad Foods
NOMD
$1.47B
| $187K | ﹤0.01% |
17,100
+11,400
| +200% | +$113K |
|
|
ARTY
4790
iShares Future AI & Tech ETF
ARTY
$4.23B
| $187K | ﹤0.01% |
+2,458
| New | +$163K |
|
4791
Lamar Advertising Co
LAMR
$14.8B
| $187K | ﹤0.01% |
+1,200
| New | +$174K |
|
|
4792
CALL
Lamar Advertising Co
LAMR
$14.8B
| $187K | ﹤0.01% |
1,200
-1,400
| -54% | -$202K |
|
|
BDN
4793
Brandywine Realty Trust
BDN
$486M
| $187K | ﹤0.01% |
59,007
-44,372
| -43% | -$133K |
|
4794
ProShares Short QQQ
PSQ
$591M
| $187K | ﹤0.01% |
+7,459
| New | +$203K |
|
4795
CALL
Artisan Partners
APAM
$2.59B
| $186K | ﹤0.01% |
5,400
+1,900
| +54% | +$69.9K |
|
|
VSXY
4796
Victoria's Secret
VSXY
$7.12B
| $186K | ﹤0.01% |
+2,231
| New | +$134K |
|
4797
PUT
Landstar System
LSTR
$5.72B
| $186K | ﹤0.01% |
900
-1,100
| -55% | -$210K |
|
4798
SPX Corp
SPXC
$8.55B
| $186K | ﹤0.01% |
759
+518
| +215% | +$113K |
|
4799
CALL
First Financial Bancorp
FFBC
$3.31B
| $186K | ﹤0.01% |
5,500
+4,900
| +817% | +$150K |
|
4800
Omega Healthcare
OHI
$14.1B
| $186K | ﹤0.01% |
+3,901
| New | +$181K |
|
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.