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 | |
|---|---|---|---|---|---|---|
4276
Greif
GEF
$4.6B
| $286K | ﹤0.01% |
3,840
+3,781
| +6,408% | +$254K |
|
|
KDK
4277
PUT
Kodiak AI
KDK
$431M
| $286K | ﹤0.01% |
56,300
+53,800
| +2,152% | +$403K |
|
4278
Keysight
KEYS
$61B
| $285K | ﹤0.01% |
815
+40
| +5% | +$13.6K |
|
|
UCTT
4279
CALL
Ultra Clean Holdings
UCTT
$3.63B
| $285K | ﹤0.01% |
2,000
+1,500
| +300% | +$132K |
|
|
KC
4280
PUT
Kingsoft Cloud Holdings
KC
$2.73B
| $285K | ﹤0.01% |
31,500
-20,500
| -39% | -$283K |
|
4281
PBF Energy
PBF
$8.83B
| $285K | ﹤0.01% |
6,255
-14,293
| -70% | -$595K |
|
|
XNDU
4282
CALL
Xanadu Quantum Technologies Class B
XNDU
$1.49B
| $285K | ﹤0.01% |
+23,500
| New | +$387K |
|
4283
PUT
Bumble
BMBL
$338M
| $284K | ﹤0.01% |
88,900
+56,800
| +177% | +$194K |
|
4284
PUT
Vita Coco
COCO
$3.23B
| $284K | ﹤0.01% |
+4,300
| New | +$290K |
|
4285
CALL
Contango Silver & Gold Inc
CTGO
$559M
| $284K | ﹤0.01% |
18,000
+600
| +3% | +$12.4K |
|
4286
PUT
Federal Realty Investment Trust
FRT
$9.46B
| $284K | ﹤0.01% |
2,300
+1,600
| +229% | +$186K |
|
|
TXNM
4287
PUT
TXNM Energy Inc
TXNM
$6.41B
| $284K | ﹤0.01% |
5,000
+2,000
| +67% | +$117K |
|
4288
PUT
Insteel Industries
IIIN
$561M
| $284K | ﹤0.01% |
9,400
+8,600
| +1,075% | +$246K |
|
4289
CALL
Ormat Technologies
ORA
$5.57B
| $283K | ﹤0.01% |
2,600
-27,300
| -91% | -$3.38M |
|
4290
PUT
Fidelity National Financial
FNF
$10.9B
| $283K | ﹤0.01% |
6,000
-56,800
| -90% | -$2.75M |
|
|
DYNC
4291
Dynamix Corp
DYNC
$241M
| $283K | ﹤0.01% |
26,221
+17,393
| +197% | +$187K |
|
|
ORR
4292
Militia Long/Short Equity ETF
ORR
$346M
| $282K | ﹤0.01% |
7,767
-31,125
| -80% | -$1.13M |
|
4293
PUT
Simplify US Equity PLUS Convexity ETF
SPYC
$82.3M
| $282K | ﹤0.01% |
15,800
-32,500
| -67% | -$1.43M |
|
4294
PUT
LPL Financial
LPLA
$24.3B
| $282K | ﹤0.01% |
1,000
-3,400
| -77% | -$1.02M |
|
4295
PUT
Mercury Systems
MRCY
$4.83B
| $281K | ﹤0.01% |
2,300
-7,100
| -76% | -$676K |
|
4296
PUT
Inspire Medical Systems
INSP
$2.05B
| $281K | ﹤0.01% |
6,300
+4,400
| +232% | +$209K |
|
4297
CALL
Vanguard Total International Bond ETF
BNDX
$82.3B
| $281K | ﹤0.01% |
+5,800
| New | +$279K |
|
4298
Warner Bros
WBD
$77.4B
| $280K | ﹤0.01% |
+10,521
| New | +$285K |
|
4299
CALL
W.P. Carey
WPC
$14.9B
| $279K | ﹤0.01% |
3,900
+1,500
| +63% | +$110K |
|
4300
PUT
Full Truck Alliance
YMM
$8.53B
| $279K | ﹤0.01% |
34,300
+17,800
| +108% | +$151K |
|
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.