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 | |
|---|---|---|---|---|---|---|
3051
PUT
Glacier Bancorp
GBCI
$5.77B
| $784K | ﹤0.01% |
+15,200
| New | +$733K |
|
3052
PUT
FormFactor
FORM
$10.1B
| $784K | ﹤0.01% |
4,900
+3,600
| +277% | +$478K |
|
3053
PUT
Nabors Industries
NBR
$1.23B
| $781K | ﹤0.01% |
9,300
-9,900
| -52% | -$921K |
|
3054
PUT
EyePoint Inc
EYPT
$284M
| $781K | ﹤0.01% |
54,600
+53,000
| +3,313% | +$709K |
|
|
DQ
3055
PUT
Daqo New Energy
DQ
$759M
| $781K | ﹤0.01% |
58,300
+52,800
| +960% | +$958K |
|
3056
PUT
Broadridge
BR
$18.6B
| $781K | ﹤0.01% |
5,700
+3,100
| +119% | +$468K |
|
|
BRSL
3057
PUT
Brightstar Lottery PLC
BRSL
$1.82B
| $780K | ﹤0.01% |
72,800
-36,100
| -33% | -$429K |
|
3058
iShares 3-7 Year Treasury Bond ETF
IEI
$17.2B
| $780K | ﹤0.01% |
6,643
-7,677
| -54% | -$904K |
|
3059
PUT
Match Group
MTCH
$9.07B
| $780K | ﹤0.01% |
20,500
-7,100
| -26% | -$252K |
|
3060
CALL
MannKind Corp
MNKD
$1.08B
| $780K | ﹤0.01% |
183,100
+44,200
| +32% | +$144K |
|
|
BLD
3061
CALL
DELISTED
TopBuild
BLD
| $780K | ﹤0.01% |
2,200
+700
| +47% | +$289K |
|
3062
CALL
Sphere Entertainment
SPHR
$5.04B
| $779K | ﹤0.01% |
4,500
+100
| +2% | +$13.9K |
|
3063
CALL
Cincinnati Financial
CINF
$24.9B
| $778K | ﹤0.01% |
4,200
+3,800
| +950% | +$630K |
|
3064
CALL
SBA Communications
SBAC
$17.6B
| $776K | ﹤0.01% |
4,400
-14,200
| -76% | -$2.93M |
|
3065
Idaho Strategic Resources
IDR
$465M
| $776K | ﹤0.01% |
23,698
+23,159
| +4,297% | +$900K |
|
3066
PUT
Atmos Energy
ATO
$26.5B
| $775K | ﹤0.01% |
4,500
+4,000
| +800% | +$716K |
|
3067
PubMatic
PUBM
$832M
| $775K | ﹤0.01% |
59,051
+38,062
| +181% | +$395K |
|
3068
NexGen Energy
NXE
$6.09B
| $774K | ﹤0.01% |
+82,467
| New | +$937K |
|
3069
CALL
Acadia Healthcare
ACHC
$2.6B
| $774K | ﹤0.01% |
26,200
+16,200
| +162% | +$416K |
|
3070
CALL
Ardelyx
ARDX
$883M
| $774K | ﹤0.01% |
151,700
+42,500
| +39% | +$259K |
|
3071
Choice Hotels
CHH
$4.6B
| $774K | ﹤0.01% |
+7,016
| New | +$776K |
|
3072
CALL
Ocugen
OCGN
$346M
| $772K | ﹤0.01% |
504,900
-102,500
| -17% | -$156K |
|
3073
CALL
Sana Biotechnology
SANA
$886M
| $772K | ﹤0.01% |
221,300
-69,400
| -24% | -$224K |
|
|
3074
Ardelyx
ARDX
$883M
| $772K | ﹤0.01% |
151,427
-23,434
| -13% | -$143K |
|
3075
CALL
Fox Class B
FOX
$23.9B
| $771K | ﹤0.01% |
14,900
-98,200
| -87% | -$5.46M |
|
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.