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 | |
|---|---|---|---|---|---|---|
3751
CALL
Pampa Energía
PAM
$4.1B
| $444K | ﹤0.01% |
5,400
-1,000
| -16% | -$83.3K |
|
3752
PUT
PACS Group
PACS
$6.82B
| $443K | ﹤0.01% |
10,400
-1,200
| -10% | -$43.2K |
|
3753
NOV
NOV
$6.95B
| $443K | ﹤0.01% |
23,905
+348
| +1% | +$6.93K |
|
|
PSIX
3754
CALL
Power Solutions International
PSIX
$1.05B
| $443K | ﹤0.01% |
11,400
-200
| -2% | -$11K |
|
3755
CALL
CEVA Inc
CEVA
$977M
| $443K | ﹤0.01% |
9,400
+8,300
| +755% | +$294K |
|
3756
BlackLine
BL
$1.54B
| $443K | ﹤0.01% |
+15,788
| New | +$472K |
|
3757
CALL
Vulcan Materials
VMC
$31.9B
| $443K | ﹤0.01% |
1,500
+1,100
| +275% | +$315K |
|
3758
Rackspace Technology
RXT
$966M
| $441K | ﹤0.01% |
67,564
-197,652
| -75% | -$771K |
|
3759
PUT
Kyndryl
KD
$2.45B
| $441K | ﹤0.01% |
39,000
+15,300
| +65% | +$191K |
|
|
AVEX
3760
CALL
AEVEX Corp
AVEX
$1.06B
| $441K | ﹤0.01% |
+21,100
| New | +$548K |
|
3761
PUT
Bausch Health
BHC
$2.16B
| $441K | ﹤0.01% |
89,400
-14,400
| -14% | -$77.3K |
|
|
ALM
3762
CALL
Almonty Industries
ALM
$3.81B
| $440K | ﹤0.01% |
26,600
+21,900
| +466% | +$418K |
|
3763
Fastenal
FAST
$57.9B
| $440K | ﹤0.01% |
9,171
-17,974
| -66% | -$816K |
|
|
TSSI
3764
CALL
TSS Inc
TSSI
$274M
| $440K | ﹤0.01% |
35,800
-118,200
| -77% | -$1.59M |
|
3765
CALL
Privia Health
PRVA
$2.54B
| $440K | ﹤0.01% |
17,100
+1,500
| +10% | +$34.7K |
|
|
GEMI
3766
PUT
Gemini Space Station
GEMI
$674M
| $440K | ﹤0.01% |
103,200
+78,400
| +316% | +$369K |
|
3767
PUT
Radiant Logistics
RLGT
$410M
| $439K | ﹤0.01% |
46,400
+36,300
| +359% | +$306K |
|
3768
CALL
Disc Medicine
IRON
$2.49B
| $439K | ﹤0.01% |
6,000
-3,300
| -35% | -$227K |
|
3769
PUT
Vanguard Short-Term Treasury ETF
VGSH
$34.4B
| $439K | ﹤0.01% |
6,400
+1,400
| +28% | +$81.6K |
|
|
BETA
3770
Beta Technologies Inc
BETA
$5.35B
| $438K | ﹤0.01% |
26,132
+20,872
| +397% | +$348K |
|
3771
Portland General Electric
POR
$5.2B
| $437K | ﹤0.01% |
8,426
-5,819
| -41% | -$295K |
|
3772
Franklin Templeton
BEN
$16.6B
| $436K | ﹤0.01% |
+13,116
| New | +$393K |
|
3773
PUT
New Oriental
EDU
$8.66B
| $436K | ﹤0.01% |
9,500
-24,700
| -72% | -$1.26M |
|
|
BORR
3774
PUT
Borr Drilling
BORR
$1.24B
| $436K | ﹤0.01% |
105,600
+8,000
| +8% | +$43.2K |
|
3775
PUT
Primoris Services
PRIM
$3.83B
| $436K | ﹤0.01% |
4,400
+2,900
| +193% | +$381K |
|
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.