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 | |
|---|---|---|---|---|---|---|
3951
James Hardie Industries
JHX
$14.7B
| $380K | ﹤0.01% |
14,523
-9,042
| -38% | -$199K |
|
3952
Hyliion Holdings
HYLN
$707M
| $380K | ﹤0.01% |
+72,944
| New | +$304K |
|
3953
CALL
Return Stacked Bonds & Managed Futures ETF
RSBT
$165M
| $380K | ﹤0.01% |
11,400
-6,000
| -34% | -$115K |
|
3954
PUT
Cingulate
CING
$70.1M
| $379K | ﹤0.01% |
+69,300
| New | +$350K |
|
3955
PUT
Essex Property Trust
ESS
$17.5B
| $379K | ﹤0.01% |
1,300
+200
| +18% | +$53.8K |
|
3956
CALL
Axcelis
ACLS
$3.83B
| $379K | ﹤0.01% |
2,000
+1,800
| +900% | +$267K |
|
3957
CALL
Kyndryl
KD
$2.45B
| $379K | ﹤0.01% |
33,500
-6,200
| -16% | -$77.3K |
|
3958
PUT
Agios Pharmaceuticals
AGIO
$2B
| $379K | ﹤0.01% |
10,200
-300
| -3% | -$9.1K |
|
3959
PUT
Lionsgate Studios
LION
$3.26B
| $378K | ﹤0.01% |
24,700
-22,000
| -47% | -$284K |
|
|
IA
3960
CALL
Innovative Solutions & Support
IA
$338M
| $378K | ﹤0.01% |
21,000
+13,200
| +169% | +$255K |
|
3961
Macerich
MAC
$6.4B
| $378K | ﹤0.01% |
14,995
+8,359
| +126% | +$188K |
|
3962
State Street SPDR S&P Aerospace & Defense ETF
XAR
$5.61B
| $377K | ﹤0.01% |
1,329
+342
| +35% | +$92.5K |
|
|
ALMS
3963
PUT
Alumis Inc
ALMS
$927M
| $377K | ﹤0.01% |
13,400
-19,600
| -59% | -$456K |
|
3964
PUT
Invesco DB Commodity Index Tracking Fund
DBC
$1.93B
| $376K | ﹤0.01% |
14,100
-36,500
| -72% | -$1.07M |
|
3965
PUT
Babcock & Wilcox
BW
$857M
| $375K | ﹤0.01% |
26,600
-106,900
| -80% | -$1.81M |
|
3966
Crane NXT
CXT
$2.73B
| $375K | ﹤0.01% |
7,329
+7,322
| +104,600% | +$313K |
|
|
TEN
3967
PUT
Tsakos Energy Navigation Ltd
TEN
$1.4B
| $375K | ﹤0.01% |
10,600
-10,700
| -50% | -$426K |
|
|
ASM
3968
CALL
Avino Silver & Gold Mines
ASM
$953M
| $375K | ﹤0.01% |
59,100
+55,600
| +1,589% | +$375K |
|
3969
NETSCOUT
NTCT
$2.87B
| $374K | ﹤0.01% |
8,591
+7,263
| +547% | +$273K |
|
3970
PUT
Avery Dennison
AVY
$13B
| $373K | ﹤0.01% |
2,300
+2,000
| +667% | +$326K |
|
3971
PUT
Diodes
DIOD
$4.44B
| $372K | ﹤0.01% |
3,400
-12,700
| -79% | -$1.29M |
|
3972
Archrock
AROC
$5.36B
| $372K | ﹤0.01% |
9,134
+1,257
| +16% | +$46.3K |
|
3973
PUT
Honeywell
HON
$67B
| $371K | ﹤0.01% |
71,600
-35,300
| -33% | -$7.88M |
|
3974
CALL
Cirrus Logic
CRUS
$5.99B
| $371K | ﹤0.01% |
2,500
+200
| +9% | +$32.7K |
|
|
SOLT
3975
PUT
2x Solana ETF
SOLT
$237M
| $371K | ﹤0.01% |
11,700
-5,200
| -31% | -$219K |
|
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.