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 | |
|---|---|---|---|---|---|---|
|
HSAI
2651
CALL
Hesai Group
HSAI
$2.55B
| $1.13M | ﹤0.01% |
62,100
-98,400
| -61% | -$2.01M |
|
2652
CALL
Fresenius Medical Care
FMS
$12.1B
| $1.13M | ﹤0.01% |
50,000
+45,500
| +1,011% | +$1.02M |
|
|
PMT
2653
PennyMac Mortgage Investment
PMT
$726M
| $1.13M | ﹤0.01% |
100,055
+20,308
| +25% | +$224K |
|
2654
CALL
Brookfield Renewable
BEPC
$5.29B
| $1.13M | ﹤0.01% |
30,400
+6,600
| +28% | +$256K |
|
2655
Home Depot
HD
$293B
| $1.13M | ﹤0.01% |
3,194
+609
| +24% | +$198K |
|
2656
CALL
Hartford Financial Services
HIG
$33.7B
| $1.13M | ﹤0.01% |
8,500
+500
| +6% | +$66.9K |
|
2657
CALL
Summit Therapeutics
SMMT
$12.5B
| $1.13M | ﹤0.01% |
77,300
+50,300
| +186% | +$892K |
|
2658
CALL
Aecom
ACM
$7.84B
| $1.12M | ﹤0.01% |
16,100
+13,300
| +475% | +$1.02M |
|
|
SF
2659
PUT
Stifel
SF
$10.6B
| $1.12M | ﹤0.01% |
+16,100
| New | +$1.2M |
|
|
FRVO
2660
CALL
Fervo Energy
FRVO
$4.47B
| $1.12M | ﹤0.01% |
+38,300
| New | +$1.38M |
|
2661
ProShares UltraPro Short Dow 30
SDOW
$148M
| $1.12M | ﹤0.01% |
46,294
-2,762
| -6% | -$77.9K |
|
2662
CALL
Medifast
MED
$136M
| $1.12M | ﹤0.01% |
105,400
-20,200
| -16% | -$233K |
|
2663
PUT
Veeva Systems
VEEV
$45.4B
| $1.12M | ﹤0.01% |
6,300
+4,500
| +250% | +$742K |
|
2664
CALL
Krispy Kreme
DNUT
$501M
| $1.11M | ﹤0.01% |
315,700
+34,800
| +12% | +$124K |
|
2665
Academy Sports + Outdoors
ASO
$3.03B
| $1.11M | ﹤0.01% |
23,625
+23,361
| +8,849% | +$1.24M |
|
2666
PUT
Casey's General Stores
CASY
$22.1B
| $1.11M | ﹤0.01% |
1,400
+700
| +100% | +$564K |
|
2667
Thermo Fisher Scientific
TMO
$250B
| $1.11M | ﹤0.01% |
2,213
-7,267
| -77% | -$3.49M |
|
|
DPRO
2668
CALL
Draganfly
DPRO
$199M
| $1.11M | ﹤0.01% |
204,700
-87,900
| -30% | -$509K |
|
|
DQ
2669
CALL
Daqo New Energy
DQ
$776M
| $1.11M | ﹤0.01% |
82,800
-42,200
| -34% | -$766K |
|
2670
PUT
Navios Maritime Partners
NMM
$2.65B
| $1.11M | ﹤0.01% |
15,800
-5,300
| -25% | -$379K |
|
2671
CALL
SSR Mining
SSRM
$7.28B
| $1.11M | ﹤0.01% |
39,100
-26,100
| -40% | -$795K |
|
2672
PUT
Ziff Davis
ZD
$1.94B
| $1.11M | ﹤0.01% |
21,100
+15,500
| +277% | +$701K |
|
2673
Backblaze
BLZE
$816M
| $1.1M | ﹤0.01% |
69,591
+67,842
| +3,879% | +$469K |
|
2674
Amcor
AMCR
$19.7B
| $1.1M | ﹤0.01% |
+25,434
| New | +$1.01M |
|
2675
PUT
Aflac
AFL
$57B
| $1.1M | ﹤0.01% |
9,400
-800
| -8% | -$92.1K |
|
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.