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Simplex Trading Portfolio holdings
AUM
$171B
Turnover
30.09%
1-Year Est. Return
85%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
+39.06%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$171B
AUM Growth
+$21.5B
(+14%)
Cap. Flow
-$29.5M
Cap. Flow % of AUM
Cap. Flow %
-0.02%
Top 10 Holdings %
Top 10 Hldgs %
49.56%
Holding
10,638
New
1,714
Increased
3,712
Reduced
3,486
Closed
1,487
Avg Time Held
Equity + Options
2.9
years
Top 10 Avg Time Held
Equity + Options
3.8
years
Top 20 Avg Time Held
Equity + Options
4.1
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.3
years
Top 20 Avg Time Held Equity only
0.3
years
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 | Held Since | |
|---|---|---|---|---|---|---|---|
5176
PUT
LendingTree
TREE
$394M
| $137K | ﹤0.01% |
3,100
-3,300
| -52% | -$133K |
2016 Q1
41 quarters
|
|
5177
CALL
SandRidge Energy
SD
$539M
| $137K | ﹤0.01% |
10,000
+5,500
| +122% | +$82K |
2020 Q2
24 quarters
|
|
5178
Kennametal
KMT
$2.31B
| $137K | ﹤0.01% |
3,907
-7,485
| -66% | -$273K |
2026 Q1
1 quarter
|
|
5179
PUT
Applied Finance IVS US SMID ETF
IVSS
$28.4M
| $137K | ﹤0.01% |
2,100
+300
| +17% | +$8.43K |
2026 Q1
1 quarter
|
|
5180
Axogen
AXGN
$2.96B
| $136K | ﹤0.01% |
2,947
+2,862
| +3,367% | +$115K |
2026 Q1
1 quarter
|
|
5181
PUT
UFP Industries
UFPI
$4.5B
| $136K | ﹤0.01% |
+1,500
| New | +$131K |
2026 Q2
0 quarters
|
|
5182
CALL
Cerus
CERS
$492M
| $136K | ﹤0.01% |
46,600
+43,200
| +1,271% | +$105K |
2024 Q1
9 quarters
|
|
5183
CALL
Grifois
GRFS
$5.47B
| $136K | ﹤0.01% |
19,200
-11,300
| -37% | -$89.3K |
2019 Q3
27 quarters
|
|
5184
CALL
FedEx Freight
FDXF
$16.4B
| $136K | ﹤0.01% |
+900
| New | +$147K |
2026 Q2
0 quarters
|
|
5185
Zebra Technologies
ZBRA
$17.9B
| $136K | ﹤0.01% |
516
+288
| +126% | +$67.7K |
2026 Q1
1 quarter
|
|
5186
PUT
Korro Bio
KRRO
$209M
| $136K | ﹤0.01% |
10,300
+9,100
| +758% | +$113K |
2025 Q4
2 quarters
|
|
5187
Spero Therapeutics
SPRO
$64.6M
| $135K | ﹤0.01% |
61,312
+31,008
| +102% | +$81.1K |
2024 Q3
7 quarters
|
|
5188
CALL
HealthEquity
HQY
$8.38B
| $135K | ﹤0.01% |
1,500
-2,800
| -65% | -$237K |
2018 Q1
33 quarters
|
|
5189
PUT
Gibraltar Industries
ROCK
$1.2B
| $135K | ﹤0.01% |
+3,000
| New | +$118K |
2026 Q2
0 quarters
|
|
5190
PUT
Anavex Life Sciences
AVXL
$121M
| $135K | ﹤0.01% |
52,200
-30,200
| -37% | -$89.4K |
2021 Q2
20 quarters
|
|
5191
Box
BOX
$5.95B
| $135K | ﹤0.01% |
5,094
-7,123
| -58% | -$178K |
2026 Q1
1 quarter
|
|
5192
BitGo Holdings
BTGO
$681M
| $135K | ﹤0.01% |
26,078
+20,141
| +339% | +$165K |
2026 Q1
1 quarter
|
|
5193
PUT
Village Farms International
VFF
$317M
| $135K | ﹤0.01% |
67,500
-253,100
| -79% | -$633K |
2025 Q2
4 quarters
|
|
5194
CALL
American Resources Corp
AREC
$136M
| $135K | ﹤0.01% |
62,700
-268,300
| -81% | -$600K |
2025 Q2
4 quarters
|
|
5195
Perion Network
PERI
$348M
| $135K | ﹤0.01% |
13,868
+9,341
| +206% | +$89.1K |
2026 Q1
1 quarter
|
|
5196
PUT
Matsons
MATX
$6.79B
| $135K | ﹤0.01% |
700
+100
| +17% | +$18.2K |
2025 Q1
5 quarters
|
|
5197
PUT
Perdoceo Education
PRDO
$1.96B
| $134K | ﹤0.01% |
4,200
+2,600
| +163% | +$89.2K |
2023 Q4
10 quarters
|
|
5198
CALL
International Money Express
IMXI
$260M
| $134K | ﹤0.01% |
9,300
+4,500
| +94% | +$68.9K |
2026 Q1
1 quarter
|
|
5199
CALL
First Trust NASDAQ Clean Edge Smart Grid Infrastructure Index Fund
GRID
$11.6B
| $134K | ﹤0.01% |
700
+500
| +250% | +$93.9K |
2025 Q3
3 quarters
|
|
5200
PUT
Meritage Homes
MTH
$4.2B
| $134K | ﹤0.01% |
1,600
-2,400
| -60% | -$164K |
2018 Q2
32 quarters
|
|
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.