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 | |
|---|---|---|---|---|---|---|
|
UNIT
1751
CALL
Uniti Group
UNIT
$2.16B
| $2.61M | ﹤0.01% |
227,500
+181,400
| +393% | +$2.06M |
|
1752
CALL
Bitwise Bitcoin ETF
BITB
$3.11B
| $2.61M | ﹤0.01% |
81,900
-6,600
| -7% | -$257K |
|
1753
CALL
CoStar Group
CSGP
$11.4B
| $2.61M | ﹤0.01% |
92,100
-3,800
| -4% | -$131K |
|
|
BULL
1754
PUT
Webull Corp
BULL
$3.88B
| $2.61M | ﹤0.01% |
400,000
+23,300
| +6% | +$151K |
|
1755
PUT
Enterprise Products Partners
EPD
$79.4B
| $2.61M | ﹤0.01% |
70,900
+33,600
| +90% | +$1.27M |
|
1756
ZIM Integrated Shipping Services
ZIM
$3.52B
| $2.61M | ﹤0.01% |
100,194
-4,456
| -4% | -$115K |
|
1757
PUT
BorgWarner
BWA
$12.5B
| $2.6M | ﹤0.01% |
39,200
-300
| -0.8% | -$19K |
|
1758
Redwire
RDW
$2.9B
| $2.59M | ﹤0.01% |
212,133
+183,706
| +646% | +$2.42M |
|
1759
PUT
Scorpio Tankers
STNG
$4.08B
| $2.59M | ﹤0.01% |
37,400
-2,600
| -7% | -$203K |
|
1760
PUT
Modine Manufacturing
MOD
$10.5B
| $2.59M | ﹤0.01% |
9,700
-23,700
| -71% | -$6.25M |
|
1761
PUT
Starwood Property Trust
STWD
$5.32B
| $2.59M | ﹤0.01% |
158,100
+3,100
| +2% | +$53.9K |
|
1762
PUT
American Electric Power
AEP
$64.4B
| $2.59M | ﹤0.01% |
18,900
-34,900
| -65% | -$4.6M |
|
1763
PUT
Papa John's
PZZA
$644M
| $2.58M | ﹤0.01% |
70,300
+31,200
| +80% | +$1.08M |
|
1764
Coeur Mining
CDE
$19.8B
| $2.58M | ﹤0.01% |
157,858
+47,779
| +43% | +$871K |
|
1765
CALL
Unusual Machines
UMAC
$1.2B
| $2.58M | ﹤0.01% |
115,500
+43,300
| +60% | +$802K |
|
1766
Energy Fuels
UUUU
$3.01B
| $2.58M | ﹤0.01% |
177,618
-129,907
| -42% | -$2.39M |
|
1767
Shake Shack
SHAK
$2.24B
| $2.57M | ﹤0.01% |
45,964
+37,340
| +433% | +$2.81M |
|
1768
CALL
McKesson
MCK
$101B
| $2.57M | ﹤0.01% |
3,400
-2,100
| -38% | -$1.66M |
|
1769
PUT
ProShares UltraShort Health Care
RXD
$3.05M
| $2.57M | ﹤0.01% |
79,700
+71,700
| +896% | +$1.41M |
|
1770
CALL
Hertz
HTZ
$620M
| $2.57M | ﹤0.01% |
1,133,700
+393,600
| +53% | +$2.15M |
|
1771
PUT
Proshares UltraShort Technology
REW
$4.14M
| $2.57M | ﹤0.01% |
165,600
+46,800
| +39% | +$722K |
|
1772
CALL
Huntington Bancshares
HBAN
$31.6B
| $2.56M | ﹤0.01% |
144,600
-31,300
| -18% | -$517K |
|
|
KLAR
1773
CALL
Klarna Group
KLAR
$4.85B
| $2.56M | ﹤0.01% |
126,500
+7,500
| +6% | +$118K |
|
1774
PUT
Grab
GRAB
$12.8B
| $2.56M | ﹤0.01% |
679,100
-88,000
| -11% | -$320K |
|
1775
CALL
Rexford Industrial Realty
REXR
$8.36B
| $2.56M | ﹤0.01% |
76,300
+73,800
| +2,952% | +$2.58M |
|
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.