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 | Held Since | |
|---|---|---|---|---|---|---|---|
8401
CALL
Zevia
ZVIA
$89.4M
| $3.26K | ﹤0.01% |
2,000
-4,400
| -69% | -$5.98K |
2024 Q3
7 quarters
|
|
8402
Federated Hermes
FHI
$4.26B
| $3.26K | ﹤0.01% |
59
-1,420
| -96% | -$80.3K |
2026 Q1
1 quarter
|
|
8403
Cushman & Wakefield Ltd
CWK
$2.76B
| $3.24K | ﹤0.01% |
+242
| New | +$3.25K |
2026 Q2
0 quarters
|
|
8404
CALL
Hanmi Financial
HAFC
$957M
| $3.24K | ﹤0.01% |
+100
| New | +$2.98K |
2026 Q2
0 quarters
|
|
8405
PUT
Greenlight Captial
GLRE
$499M
| $3.24K | ﹤0.01% |
200
-1,000
| -83% | -$17.2K |
2025 Q3
3 quarters
|
|
8406
VistaGen Therapeutics
VTGN
$8.76M
| $3.23K | ﹤0.01% |
14,295
-75,354
| -84% | -$45.5K |
2026 Q1
1 quarter
|
|
8407
CALL
Arcos Dorados Holdings
ARCO
$1.67B
| $3.22K | ﹤0.01% |
400
-8,200
| -95% | -$70.8K |
2023 Q2
12 quarters
|
|
8408
iHeartMedia
IHRT
$255M
| $3.22K | ﹤0.01% |
+751
| New | +$3.33K |
2026 Q2
0 quarters
|
|
8409
CALL
XBiotech
XBIT
$60.1M
| $3.22K | ﹤0.01% |
1,400
-41,800
| -97% | -$101K |
2025 Q4
2 quarters
|
|
8410
Tredegar Corp
TG
$282M
| $3.22K | ﹤0.01% |
+404
| New | +$3.43K |
2026 Q2
0 quarters
|
|
|
IMMP
8411
PUT
Immutep
IMMP
$23.1M
| $3.21K | ﹤0.01% |
385
+65
| +20% | +$565 |
2025 Q4
2 quarters
|
|
8412
DELISTED
Maxeon Solar Technologies
MAXN
| $3.21K | ﹤0.01% |
12,335
+10,163
| +468% | +$13.8K |
2026 Q1
1 quarter
|
|
8413
PUT
Columbia Banking Systems
COLB
$8.4B
| $3.2K | ﹤0.01% |
100
-1,200
| -92% | -$35.6K |
2023 Q1
13 quarters
|
|
8414
CALL
Ranger Energy Services
RNGR
$340M
| $3.2K | ﹤0.01% |
200
-100
| -33% | -$1.64K |
2025 Q3
3 quarters
|
|
8415
Direxion Daily S&P 500 High Beta Bear 3X ETF
HIBS
$34.2M
| $3.2K | ﹤0.01% |
184
-5,146
| -97% | -$141K |
2026 Q1
1 quarter
|
|
8416
Nexxen International
NEXN
$515M
| $3.18K | ﹤0.01% |
+352
| New | +$2.78K |
2026 Q2
0 quarters
|
|
8417
Lyell Immunopharma
LYEL
$232M
| $3.18K | ﹤0.01% |
226
-467
| -67% | -$8.45K |
2024 Q4
6 quarters
|
|
8418
Direxion Daily TSLA Bear 1X ETF
TSLS
$45.9M
| $3.17K | ﹤0.01% |
+62
| New | +$3.46K |
2026 Q2
0 quarters
|
|
8419
CALL
Nu Skin
NUS
$235M
| $3.17K | ﹤0.01% |
600
+400
| +200% | +$2.56K |
2014 Q4
46 quarters
|
|
8420
Limoneira
LMNR
$201M
| $3.16K | ﹤0.01% |
241
-174
| -42% | -$2.24K |
2025 Q3
3 quarters
|
|
8421
PUT
Seritage Growth Properties
SRG
$92.4M
| $3.16K | ﹤0.01% |
1,200
-115,300
| -99% | -$303K |
2016 Q4
38 quarters
|
|
8422
PUT
Brixmor Property Group
BRX
$8.63B
| $3.15K | ﹤0.01% |
100
| – | – |
2025 Q1
5 quarters
|
|
8423
Sally Beauty Holdings
SBH
$1.62B
| $3.15K | ﹤0.01% |
223
-12,371
| -98% | -$167K |
2025 Q4
2 quarters
|
|
8424
CALL
Enel Chile
ENIC
$6.05B
| $3.15K | ﹤0.01% |
+700
| New | +$3.08K |
2026 Q2
0 quarters
|
|
8425
PUT
Neurogene
NGNE
$489M
| $3.14K | ﹤0.01% |
100
-2,700
| -96% | -$74.3K |
2025 Q1
5 quarters
|
|
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.