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 | |
|---|---|---|---|---|---|---|
|
OPTU
5051
CALL
Optimum Communications Inc
OPTU
$389M
| $153K | ﹤0.01% |
105,400
+73,600
| +231% | +$91.5K |
|
5052
CALL
Gossamer Bio
GOSS
$70.8M
| $153K | ﹤0.01% |
11,588
+2,397
| +26% | +$53.5K |
|
5053
PUT
Valens Semiconductor
VLN
$198M
| $153K | ﹤0.01% |
67,500
+66,600
| +7,400% | +$149K |
|
|
AAMI
5054
Acadian Asset Management
AAMI
$3.28B
| $152K | ﹤0.01% |
+2,132
| New | +$149K |
|
5055
Gladstone Investment Corp
GAIN
$630M
| $152K | ﹤0.01% |
9,859
-6,138
| -38% | -$96.3K |
|
5056
CALL
Coty
COTY
$2.37B
| $152K | ﹤0.01% |
70,400
+64,900
| +1,180% | +$140K |
|
5057
CALL
Ziff Davis
ZD
$1.93B
| $152K | ﹤0.01% |
2,900
-2,600
| -47% | -$118K |
|
5058
LPL Financial
LPLA
$24.3B
| $152K | ﹤0.01% |
+539
| New | +$162K |
|
5059
Mama's Creations
MAMA
$607M
| $152K | ﹤0.01% |
+8,496
| New | +$129K |
|
5060
Inhibrx
INBX
$1.54B
| $151K | ﹤0.01% |
+1,598
| New | +$160K |
|
5061
PUT
Old Republic International
ORI
$9.19B
| $151K | ﹤0.01% |
3,700
+1,400
| +61% | +$55.5K |
|
5062
PUT
Sturm, Ruger & Co
RGR
$674M
| $151K | ﹤0.01% |
4,000
+1,300
| +48% | +$52.3K |
|
5063
YieldMax TSLA Option Income Strategy ETF
TSLY
$661M
| $151K | ﹤0.01% |
5,302
-703
| -12% | -$20.6K |
|
5064
CALL
Alight
ALIT
$244M
| $151K | ﹤0.01% |
13,495
+90
| +0.7% | +$1.27K |
|
5065
PUT
Ferrovial N.V. Ordinary Shares
FER
$39.3B
| $151K | ﹤0.01% |
2,200
+1,190
| +118% | +$81.3K |
|
5066
PUT
Spyre Therapeutics
SYRE
$7.47B
| $151K | ﹤0.01% |
+1,700
| New | +$124K |
|
5067
PUT
Phibro Animal Health
PAHC
$1.44B
| $151K | ﹤0.01% |
4,800
-2,500
| -34% | -$105K |
|
5068
CALL
Robert Half
RHI
$3.78B
| $150K | ﹤0.01% |
4,900
-9,200
| -65% | -$258K |
|
5069
Talos Energy
TALO
$2.71B
| $150K | ﹤0.01% |
11,642
-26,606
| -70% | -$397K |
|
5070
CALL
Lexicon Pharmaceuticals
LXRX
$837M
| $150K | ﹤0.01% |
62,600
-69,600
| -53% | -$136K |
|
5071
CALL
Energizer
ENR
$1.49B
| $150K | ﹤0.01% |
7,000
-5,000
| -42% | -$95.3K |
|
5072
Jackson Financial
JXN
$8.9B
| $150K | ﹤0.01% |
1,465
+800
| +120% | +$86.7K |
|
5073
iShares US Industrials ETF
IYJ
$2.01B
| $150K | ﹤0.01% |
+900
| New | +$142K |
|
|
LTC
5074
CALL
LTC Properties
LTC
$2.32B
| $150K | ﹤0.01% |
3,900
-1,300
| -25% | -$49.4K |
|
|
KQQQ
5075
PUT
Kurv Technology Titans Select ETF
KQQQ
$135M
| $150K | ﹤0.01% |
6,600
+4,700
| +247% | +$137K |
|
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.