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 | |
|---|---|---|---|---|---|---|
5076
IDEAYA Biosciences
IDYA
$3.65B
| $150K | ﹤0.01% |
+4,021
| New | +$123K |
|
|
BCYC
5077
Bicycle Therapeutics
BCYC
$255M
| $149K | ﹤0.01% |
+35,232
| New | +$162K |
|
5078
CALL
OneSpan
OSPN
$657M
| $149K | ﹤0.01% |
10,400
+10,100
| +3,367% | +$128K |
|
|
AIRJ
5079
Montana Technologies Corp
AIRJ
$290M
| $149K | ﹤0.01% |
26,917
+20,618
| +327% | +$79.9K |
|
5080
PUT
Precigen
PGEN
$2.88B
| $149K | ﹤0.01% |
26,100
-57,500
| -69% | -$249K |
|
|
SPCF
5081
PUT
ProShares Ultra SpaceX
SPCF
$78.6M
| $149K | ﹤0.01% |
+5,800
| New | +$155K |
|
5082
NatWest
NWG
$72.4B
| $149K | ﹤0.01% |
+8,437
| New | +$136K |
|
5083
John Wiley & Sons Class A
WLY
$2.42B
| $149K | ﹤0.01% |
3,066
+2,665
| +665% | +$112K |
|
5084
PUT
Krystal Biotech
KRYS
$9.92B
| $149K | ﹤0.01% |
400
| – | – |
|
5085
PUT
Warby Parker
WRBY
$3.4B
| $149K | ﹤0.01% |
4,900
+1,000
| +26% | +$24.8K |
|
|
PAL
5086
Proficient Auto Logistics
PAL
$101M
| $148K | ﹤0.01% |
21,798
+18,381
| +538% | +$123K |
|
5087
PUT
Pacific Biosciences
PACB
$569M
| $148K | ﹤0.01% |
88,000
-6,300
| -7% | -$9.16K |
|
|
SOLS
5088
Solstice Advanced Materials
SOLS
$8.9B
| $148K | ﹤0.01% |
1,665
-1,903
| -53% | -$157K |
|
5089
PUT
Xerox
XRX
$422M
| $147K | ﹤0.01% |
52,700
+9,600
| +22% | +$24K |
|
5090
PUT
SPX Corp
SPXC
$8.55B
| $147K | ﹤0.01% |
+600
| New | +$131K |
|
5091
CALL
Wipro
WIT
$15.9B
| $147K | ﹤0.01% |
65,300
+62,000
| +1,879% | +$132K |
|
5092
PUT
Winnebago Industries
WGO
$754M
| $147K | ﹤0.01% |
4,700
+900
| +24% | +$27.4K |
|
|
AWTM
5093
PUT
DELISTED
AWTM Ultra-Short Duration Enhanced Income ETF
AWTM
| $147K | ﹤0.01% |
5,100
-900
| -15% | -$25.9K |
|
|
IREG
5094
CALL
Leverage Shares 2X Long IREN Daily ETF
IREG
$21.2M
| $147K | ﹤0.01% |
10,800
+10,200
| +1,700% | +$201K |
|
5095
AAR Corp
AIR
$4.3B
| $146K | ﹤0.01% |
1,024
-861
| -46% | -$102K |
|
5096
CALL
Zimmer Biomet
ZBH
$17.4B
| $146K | ﹤0.01% |
1,700
-1,800
| -51% | -$158K |
|
5097
CALL
Tootsie Roll Industries
TR
$2.86B
| $146K | ﹤0.01% |
+3,700
| New | +$150K |
|
5098
Quantum-Si Incorporated
QSI
$210M
| $146K | ﹤0.01% |
165,293
+74,762
| +83% | +$71.2K |
|
5099
Invesco S&P 500 Low Volatility ETF
SPLV
$7.06B
| $146K | ﹤0.01% |
+1,951
| New | +$144K |
|
5100
PUT
Brookfield Infrastructure Partners
BIP
$16.3B
| $146K | ﹤0.01% |
4,000
+3,000
| +300% | +$112K |
|
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.