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 | |
|---|---|---|---|---|---|---|
|
SUNB
3826
PUT
Sunbelt Rentals Holdings
SUNB
$30.7B
| $419K | ﹤0.01% |
+5,600
| New | +$420K |
|
|
DEFT
3827
CALL
Defi Technologies
DEFT
$191M
| $418K | ﹤0.01% |
814,200
+476,700
| +141% | +$323K |
|
3828
CALL
Upbound Group
UPBD
$921M
| $418K | ﹤0.01% |
19,700
+18,300
| +1,307% | +$342K |
|
3829
Direxion Daily S&P 500 Bull 2X ETF
SPUU
$287M
| $418K | ﹤0.01% |
1,937
-37
| -2% | -$7.55K |
|
3830
CVR Energy
CVI
$5.1B
| $417K | ﹤0.01% |
+15,159
| New | +$481K |
|
|
XNET
3831
PUT
Xunlei
XNET
$310M
| $417K | ﹤0.01% |
74,600
+63,900
| +597% | +$369K |
|
3832
Option Care Health
OPCH
$3.43B
| $417K | ﹤0.01% |
+19,885
| New | +$462K |
|
|
SA
3833
Seabridge Gold
SA
$3.07B
| $417K | ﹤0.01% |
16,200
-1,079
| -6% | -$32.5K |
|
|
NVMI
3834
Nova
NVMI
$11.8B
| $417K | ﹤0.01% |
+768
| New | +$395K |
|
|
SOLS
3835
PUT
Solstice Advanced Materials
SOLS
$9.04B
| $416K | ﹤0.01% |
4,700
-9,900
| -68% | -$817K |
|
3836
PUT
GoDaddy
GDDY
$11.9B
| $416K | ﹤0.01% |
4,900
-2,800
| -36% | -$236K |
|
|
JBIO
3837
PUT
Jade Biosciences
JBIO
$913M
| $416K | ﹤0.01% |
18,700
| – | – |
|
3838
PUT
Motorola Solutions
MSI
$74.8B
| $415K | ﹤0.01% |
1,000
+600
| +150% | +$251K |
|
|
NMAX
3839
CALL
Newsmax Inc
NMAX
$1.41B
| $415K | ﹤0.01% |
50,100
+39,800
| +386% | +$286K |
|
3840
Direxion Daily Regional Banks Bull 3X ETF
DPST
$320M
| $415K | ﹤0.01% |
2,932
+2,823
| +2,590% | +$331K |
|
|
GAP
3841
The Gap Inc
GAP
$8.06B
| $414K | ﹤0.01% |
+22,165
| New | +$511K |
|
3842
CALL
CubeSmart
CUBE
$8.42B
| $414K | ﹤0.01% |
10,400
-3,600
| -26% | -$143K |
|
3843
Advanced Energy
AEIS
$11.1B
| $412K | ﹤0.01% |
+1,106
| New | +$387K |
|
|
FINV
3844
CALL
FinVolution Group
FINV
$725M
| $412K | ﹤0.01% |
86,000
+75,100
| +689% | +$371K |
|
|
TLN
3845
Talen Energy Corp
TLN
$14.5B
| $412K | ﹤0.01% |
+1,072
| New | +$393K |
|
3846
PUT
Alpha and Omega Semiconductor
AOSL
$828M
| $412K | ﹤0.01% |
8,700
-3,400
| -28% | -$137K |
|
|
GTM
3847
CALL
ZoomInfo Technologies
GTM
$1.05B
| $412K | ﹤0.01% |
140,500
+69,700
| +98% | +$313K |
|
3848
Cannae Holdings
CNNE
$676M
| $412K | ﹤0.01% |
28,578
+16,433
| +135% | +$223K |
|
|
TGB
3849
PUT
Trekor Metals
TGB
$3.22B
| $411K | ﹤0.01% |
59,800
-5,900
| -9% | -$42.2K |
|
3850
PUT
PagerDuty
PD
$1.14B
| $411K | ﹤0.01% |
42,600
+32,300
| +314% | +$244K |
|
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.