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 | |
|---|---|---|---|---|---|---|
1401
CALL
Ambarella
AMBA
$3.21B
| $3.82M | ﹤0.01% |
44,500
+32,000
| +256% | +$2.2M |
|
1402
CALL
FTAI Aviation
FTAI
$18B
| $3.81M | ﹤0.01% |
14,100
-7,400
| -34% | -$1.86M |
|
|
VG
1403
CALL
Venture Global Inc
VG
$31.6B
| $3.81M | ﹤0.01% |
342,700
-538,900
| -61% | -$6.82M |
|
1404
CALL
2x Long VIX Futures ETF
UVIX
$164M
| $3.81M | ﹤0.01% |
27,435
+6,795
| +33% | +$675K |
|
1405
CALL
Edwards Lifesciences
EW
$49.7B
| $3.81M | ﹤0.01% |
42,100
+9,800
| +30% | +$821K |
|
1406
PUT
Gildan
GIL
$7.59B
| $3.81M | ﹤0.01% |
73,800
+15,200
| +26% | +$873K |
|
|
PENG
1407
Penguin Solutions Inc
PENG
$2.88B
| $3.81M | ﹤0.01% |
50,074
+49,818
| +19,460% | +$2.27M |
|
1408
CALL
TTM Technologies
TTMI
$13.6B
| $3.8M | ﹤0.01% |
20,300
+13,300
| +190% | +$2.15M |
|
1409
Snap
SNAP
$9.17B
| $3.79M | ﹤0.01% |
854,569
-867,897
| -50% | -$4.75M |
|
1410
CALL
Galicia Financial Group
GGAL
$6.22B
| $3.79M | ﹤0.01% |
75,800
+6,100
| +9% | +$287K |
|
|
TE
1411
PUT
T1 Energy
TE
$1.11B
| $3.79M | ﹤0.01% |
399,800
+298,100
| +293% | +$2.12M |
|
1412
PUT
HCA Healthcare
HCA
$94.3B
| $3.78M | ﹤0.01% |
9,700
+1,000
| +11% | +$423K |
|
1413
Target
TGT
$71.5B
| $3.78M | ﹤0.01% |
+28,909
| New | +$3.67M |
|
1414
CALL
Fastenal
FAST
$57.9B
| $3.77M | ﹤0.01% |
78,500
+10,300
| +15% | +$467K |
|
1415
PUT
Immunovant
IMVT
$6.88B
| $3.77M | ﹤0.01% |
97,800
+34,200
| +54% | +$1.04M |
|
|
SOBO
1416
CALL
South Bow Corp
SOBO
$7.09B
| $3.77M | ﹤0.01% |
106,900
+88,800
| +491% | +$3.13M |
|
1417
CALL
Cboe Global Markets
CBOE
$26.9B
| $3.76M | ﹤0.01% |
15,500
+12,000
| +343% | +$3.67M |
|
1418
PUT
Bunge Global
BG
$20.9B
| $3.76M | ﹤0.01% |
35,200
-6,200
| -15% | -$762K |
|
1419
PUT
Generac Holdings
GNRC
$12.3B
| $3.75M | ﹤0.01% |
12,800
-300
| -2% | -$75.1K |
|
1420
CALL
Gates Industrial Corp
GTES
$6.8B
| $3.74M | ﹤0.01% |
133,800
+133,100
| +19,014% | +$3.42M |
|
1421
CALL
Western Alliance Bancorporation
WAL
$8.47B
| $3.74M | ﹤0.01% |
45,500
+34,800
| +325% | +$2.75M |
|
1422
PUT
Shift4
FOUR
$3.04B
| $3.74M | ﹤0.01% |
76,800
+60,200
| +363% | +$2.6M |
|
1423
PUT
TripAdvisor
TRIP
$986M
| $3.73M | ﹤0.01% |
272,200
+218,800
| +410% | +$2.48M |
|
|
DCH
1424
CALL
Dauch Corp
DCH
$1.3B
| $3.73M | ﹤0.01% |
687,800
-44,300
| -6% | -$269K |
|
1425
PUT
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$25.5B
| $3.73M | ﹤0.01% |
5,300
+5,200
| +5,200% | +$3.48M |
|
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.