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 | |
|---|---|---|---|---|---|---|
3451
Sun Life Financial
SLF
$44.2B
| $569K | ﹤0.01% |
7,260
+7,253
| +103,614% | +$522K |
|
3452
Kodiak Sciences
KOD
$5.65B
| $569K | ﹤0.01% |
14,610
-5,145
| -26% | -$200K |
|
3453
Imperial Petroleum
IMPP
$228M
| $569K | ﹤0.01% |
123,348
+83,456
| +209% | +$406K |
|
3454
PUT
Absci
ABSI
$1.63B
| $568K | ﹤0.01% |
49,000
-101,300
| -67% | -$571K |
|
|
INV
3455
CALL
Innventure Inc
INV
$58.4M
| $568K | ﹤0.01% |
112,000
-45,100
| -29% | -$265K |
|
3456
CALL
QuidelOrtho
QDEL
$743M
| $567K | ﹤0.01% |
32,400
+31,600
| +3,950% | +$417K |
|
3457
CALL
Laser Photonics
LASE
$52.6M
| $567K | ﹤0.01% |
343,600
+155,900
| +83% | +$214K |
|
3458
PUT
American Water Works
AWK
$25.6B
| $566K | ﹤0.01% |
4,300
-10,800
| -72% | -$1.39M |
|
3459
CALL
Lightpath Technologies
LPTH
$688M
| $566K | ﹤0.01% |
34,600
+700
| +2% | +$9.77K |
|
3460
PUT
Bruker
BRKR
$9.64B
| $566K | ﹤0.01% |
9,400
-8,500
| -47% | -$397K |
|
3461
PUT
SSR Mining
SSRM
$6.9B
| $566K | ﹤0.01% |
20,000
+12,200
| +156% | +$372K |
|
3462
Clear Secure
YOU
$4.15B
| $565K | ﹤0.01% |
+10,137
| New | +$554K |
|
3463
PUT
Protagonist Therapeutics
PTGX
$9.22B
| $564K | ﹤0.01% |
+4,600
| New | +$480K |
|
3464
RELX
RELX
$57.5B
| $562K | ﹤0.01% |
17,754
+8,708
| +96% | +$295K |
|
3465
CALL
Fortive
FTV
$16.8B
| $562K | ﹤0.01% |
9,200
+6,200
| +207% | +$372K |
|
3466
CALL
Enlight Renewable Energy
ENLT
$9.62B
| $561K | ﹤0.01% |
6,300
+3,500
| +125% | +$308K |
|
|
VELO
3467
Velo3D Inc
VELO
$353M
| $560K | ﹤0.01% |
31,932
+18,285
| +134% | +$317K |
|
|
HUCK
3468
Huckleberry.ai, Inc. Class B Common Stock
HUCK
$156M
| $559K | ﹤0.01% |
178,693
+159,790
| +845% | +$534K |
|
3469
CALL
RB Global
RBA
$15B
| $559K | ﹤0.01% |
4,800
| – | – |
|
|
NAK
3470
Northern Dynasty Minerals
NAK
$821M
| $559K | ﹤0.01% |
291,104
+72,944
| +33% | +$146K |
|
3471
CALL
IBEX
IBEX
$589M
| $559K | ﹤0.01% |
18,400
| – | – |
|
3472
CALL
Movado Group
MOV
$747M
| $558K | ﹤0.01% |
14,200
-2,900
| -17% | -$90.5K |
|
3473
Vista Energy
VIST
$7.4B
| $557K | ﹤0.01% |
8,736
-36,398
| -81% | -$2.56M |
|
3474
PUT
Sanmina
SANM
$11.8B
| $557K | ﹤0.01% |
2,200
+1,800
| +450% | +$394K |
|
|
VNET
3475
PUT
VNET Group
VNET
$1.7B
| $556K | ﹤0.01% |
69,200
+29,500
| +74% | +$268K |
|
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.