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 | |
|---|---|---|---|---|---|---|
4626
PUT
Sociedad Química y Minera de Chile
SQM
$18.9B
| $215K | ﹤0.01% |
2,900
-2,500
| -46% | -$209K |
|
|
ONIT
4627
PUT
Onity Group
ONIT
$249M
| $215K | ﹤0.01% |
5,400
-4,400
| -45% | -$174K |
|
4628
PUT
Payoneer
PAYO
$2.42B
| $214K | ﹤0.01% |
30,100
+25,400
| +540% | +$139K |
|
4629
Fox Class B
FOX
$23.5B
| $214K | ﹤0.01% |
+4,574
| New | +$254K |
|
4630
CALL
SFL Corp
SFL
$1.81B
| $214K | ﹤0.01% |
21,000
-19,500
| -48% | -$221K |
|
4631
PUT
indie Semiconductor
INDI
$686M
| $214K | ﹤0.01% |
47,700
-600
| -1% | -$2.39K |
|
4632
CALL
Dole
DOLE
$1.22B
| $214K | ﹤0.01% |
+15,600
| New | +$227K |
|
4633
PUT
Satellogic
SATL
$861M
| $214K | ﹤0.01% |
37,400
-57,100
| -60% | -$418K |
|
4634
CALL
Alphatec Holdings
ATEC
$1.6B
| $214K | ﹤0.01% |
24,700
-2,100
| -8% | -$19.1K |
|
4635
CALL
Editas Medicine
EDIT
$398M
| $214K | ﹤0.01% |
65,900
+53,500
| +431% | +$156K |
|
4636
Donaldson
DCI
$10.1B
| $213K | ﹤0.01% |
+2,377
| New | +$204K |
|
|
BHYP
4637
Bitwise Hyperliquid ETF
BHYP
$153M
| $213K | ﹤0.01% |
+5,798
| New | +$202K |
|
|
ABVX
4638
Abivax
ABVX
$8.6B
| $213K | ﹤0.01% |
1,600
-1,250
| -44% | -$141K |
|
4639
PUT
Cellebrite
CLBT
$2.75B
| $213K | ﹤0.01% |
14,600
-6,900
| -32% | -$91.2K |
|
4640
CALL
Intrepid Potash
IPI
$435M
| $213K | ﹤0.01% |
6,500
-6,400
| -50% | -$243K |
|
4641
Graphic Packaging
GPK
$2.73B
| $213K | ﹤0.01% |
20,151
-16,134
| -44% | -$165K |
|
4642
CALL
Concentrix
CNXC
$1.52B
| $213K | ﹤0.01% |
9,500
+2,500
| +36% | +$65.2K |
|
|
YQ
4643
PUT
17 Education & Technology Group
YQ
$34.9M
| $213K | ﹤0.01% |
96,700
| – | – |
|
4644
Jack Henry & Associates
JKHY
$10.3B
| $212K | ﹤0.01% |
1,542
+1,486
| +2,654% | +$211K |
|
4645
PUT
Spire Global
SPIR
$436M
| $212K | ﹤0.01% |
11,400
-29,200
| -72% | -$543K |
|
4646
PUT
Kopin
KOPN
$883M
| $212K | ﹤0.01% |
47,300
+27,200
| +135% | +$118K |
|
4647
PUT
Weatherford International
WFRD
$5.75B
| $212K | ﹤0.01% |
2,600
-1,700
| -40% | -$172K |
|
4648
CALL
Healthpeak Properties
DOC
$13.9B
| $212K | ﹤0.01% |
9,900
-43,900
| -82% | -$819K |
|
4649
CALL
Unifirst Corp
UNF
$4.6B
| $212K | ﹤0.01% |
800
-900
| -53% | -$235K |
|
4650
Chegg
CHGG
$78.2M
| $211K | ﹤0.01% |
208,567
+193,450
| +1,280% | +$212K |
|
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.