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 | |
|---|---|---|---|---|---|---|
3551
PUT
Pitney Bowes
PBI
$2.25B
| $522K | ﹤0.01% |
29,800
-6,100
| -17% | -$93.3K |
|
3552
CALL
MarketAxess Holdings
MKTX
$5.77B
| $522K | ﹤0.01% |
4,600
-5,600
| -55% | -$798K |
|
3553
Bitdeer Technologies
BTDR
$3B
| $522K | ﹤0.01% |
32,882
+29,762
| +954% | +$427K |
|
3554
CALL
Ralph Lauren
RL
$21.3B
| $522K | ﹤0.01% |
1,300
-9,100
| -88% | -$3.39M |
|
3555
Birkenstock
BIRK
$5.44B
| $521K | ﹤0.01% |
12,104
+3,194
| +36% | +$129K |
|
3556
PUT
United States Antimony
UAMY
$638M
| $521K | ﹤0.01% |
71,700
-165,800
| -70% | -$1.5M |
|
3557
Stagwell
STGW
$2.01B
| $520K | ﹤0.01% |
70,051
+40,901
| +140% | +$271K |
|
3558
Ceco Environmental
CECO
$4.23B
| $520K | ﹤0.01% |
+5,730
| New | +$453K |
|
3559
CALL
Valmont Industries
VMI
$9.03B
| $520K | ﹤0.01% |
900
+600
| +200% | +$302K |
|
3560
WisdomTree
WT
$3.65B
| $520K | ﹤0.01% |
+30,676
| New | +$543K |
|
3561
CALL
Inovio Pharmaceuticals
INO
$121M
| $519K | ﹤0.01% |
471,400
+357,100
| +312% | +$424K |
|
3562
Ezcorp Inc
EZPW
$1.89B
| $518K | ﹤0.01% |
14,997
+2,237
| +18% | +$70.6K |
|
|
AMRZ
3563
PUT
Amrize Ltd
AMRZ
$20.8B
| $517K | ﹤0.01% |
9,700
-3,100
| -24% | -$168K |
|
3564
CALL
Exelixis
EXEL
$14.5B
| $517K | ﹤0.01% |
9,500
+200
| +2% | +$9.74K |
|
|
3565
PUT
Exelixis
EXEL
$14.5B
| $517K | ﹤0.01% |
9,500
+7,100
| +296% | +$346K |
|
3566
Sonoco
SON
$4.94B
| $516K | ﹤0.01% |
+9,155
| New | +$470K |
|
3567
CALL
Oric Pharmaceuticals
ORIC
$1.38B
| $516K | ﹤0.01% |
47,600
+46,900
| +6,700% | +$425K |
|
3568
PUT
RBC Bearings
RBC
$16B
| $515K | ﹤0.01% |
800
-500
| -38% | -$298K |
|
3569
PUT
UroGen Pharma
URGN
$2B
| $515K | ﹤0.01% |
14,000
-4,500
| -24% | -$122K |
|
3570
Advanced Drainage Systems
WMS
$9.86B
| $515K | ﹤0.01% |
+3,279
| New | +$469K |
|
3571
CALL
Tencent Music
TME
$13.6B
| $514K | ﹤0.01% |
61,600
-50,300
| -45% | -$459K |
|
3572
CALL
Rapid7
RPD
$795M
| $514K | ﹤0.01% |
63,500
-90,100
| -59% | -$597K |
|
|
STLN
3573
CALL
Starling Oncology
STLN
$677M
| $514K | ﹤0.01% |
94,700
-176,700
| -65% | -$742K |
|
3574
CALL
Federal Signal
FSS
$7.02B
| $514K | ﹤0.01% |
4,000
+3,900
| +3,900% | +$447K |
|
3575
PUT
Palladyne AI
PDYN
$261M
| $513K | ﹤0.01% |
84,300
+41,500
| +97% | +$275K |
|
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.