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 | |
|---|---|---|---|---|---|---|
251
PUT
Applied Optoelectronics
AAOI
$8.61B
| $46.8M | 0.03% |
315,600
+112,100
| +55% | +$18.2M |
|
252
PUT
Marathon Digital Holdings
MARA
$4.85B
| $46.7M | 0.03% |
3,362,700
-986,700
| -23% | -$12.3M |
|
|
DRAM
253
Roundhill Memory ETF
DRAM
$29.1B
| $46.2M | 0.03% |
+625,556
| New | +$32.6M |
|
254
CALL
First Solar
FSLR
$19.1B
| $46.1M | 0.03% |
195,200
-40,500
| -17% | -$9.49M |
|
255
CALL
Datadog
DDOG
$96.3B
| $45.9M | 0.03% |
176,400
+14,600
| +9% | +$2.71M |
|
256
CALL
Vertiv
VRT
$97.5B
| $45.2M | 0.03% |
135,100
-1,500
| -1% | -$476K |
|
257
CALL
Baidu
BIDU
$29.8B
| $45.2M | 0.03% |
395,700
+85,700
| +28% | +$10.6M |
|
258
PUT
Johnson & Johnson
JNJ
$654B
| $45.1M | 0.03% |
177,400
-1,400
| -0.8% | -$326K |
|
259
CALL
Vistra
VST
$46.5B
| $44.5M | 0.03% |
280,500
+144,200
| +106% | +$22.4M |
|
260
PUT
Invesco Aerospace & Defense ETF
PPA
$7.6B
| $44.5M | 0.03% |
213,500
+128,400
| +151% | +$22M |
|
261
PUT
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$206M
| $44M | 0.03% |
1,951,600
+306,700
| +19% | +$11.3M |
|
262
CALL
Coherent
COHR
$57.9B
| $43.9M | 0.03% |
111,200
+25,400
| +30% | +$8.98M |
|
|
SCIU
263
CALL
DELISTED
Global X Scientific Beta US ETF
SCIU
| $43.9M | 0.03% |
800,600
-296,400
| -27% | -$16.2M |
|
264
CALL
PepsiCo
PEP
$176B
| $43.7M | 0.03% |
322,900
+105,400
| +48% | +$15.8M |
|
265
CALL
PG&E
PCG
$37B
| $43.5M | 0.03% |
2,585,300
+1,589,500
| +160% | +$26.7M |
|
266
PUT
Arista Networks
ANET
$261B
| $43.4M | 0.03% |
255,700
+61,200
| +31% | +$9.61M |
|
|
CBRS
267
CALL
Cerebras Systems
CBRS
$49.1B
| $43.2M | 0.03% |
+195,700
| New | +$46.1M |
|
268
CALL
American Express
AXP
$209B
| $42.9M | 0.03% |
126,800
+16,300
| +15% | +$5.22M |
|
269
PUT
United Airlines
UAL
$37B
| $42.8M | 0.03% |
314,500
-224,600
| -42% | -$23.3M |
|
270
CALL
Cloudflare
NET
$124B
| $42.4M | 0.02% |
173,000
-20,500
| -11% | -$4.48M |
|
271
CALL
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$7.48B
| $42.3M | 0.02% |
290,400
+21,800
| +8% | +$633K |
|
272
CALL
NextEra Energy
NEE
$159B
| $42.2M | 0.02% |
481,100
-211,300
| -31% | -$19.1M |
|
273
PUT
Newmont
NEM
$128B
| $42.1M | 0.02% |
450,600
-31,300
| -6% | -$3.41M |
|
274
CALL
CVS Health
CVS
$114B
| $42.1M | 0.02% |
406,600
+23,600
| +6% | +$2.11M |
|
275
CALL
Centene
CNC
$30.5B
| $41.9M | 0.02% |
652,300
-262,400
| -29% | -$14M |
|
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.