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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 | |
|---|---|---|---|---|---|---|---|
5151
Worthington Enterprises
WOR
$3.16B
| $140K | ﹤0.01% |
2,608
-1,053
| -29% | -$58.7K |
2024 Q4
6 quarters
|
|
5152
CALL
908 Devices
MASS
$531M
| $140K | ﹤0.01% |
+16,100
| New | +$124K |
2026 Q2
0 quarters
|
|
5153
CALL
PDS Biotechnology
PDSB
$112M
| $140K | ﹤0.01% |
158,800
+158,500
| +52,833% | +$168K |
2026 Q1
1 quarter
|
|
5154
PUT
AtriCure
ATRC
$3.18B
| $140K | ﹤0.01% |
5,000
| – | – |
2026 Q1
1 quarter
|
|
5155
PUT
Karman Holdings
KRMN
$5.53B
| $140K | ﹤0.01% |
2,800
+2,600
| +1,300% | +$168K |
2025 Q3
3 quarters
|
|
5156
PUT
First Trust Exchange-Traded Fund VI Multi-Asset Diversified Income Index Fund
MDIV
$418M
| $140K | ﹤0.01% |
2,000
+1,900
| +1,900% | +$31.4K |
2026 Q1
1 quarter
|
|
5157
iShares Copper and Metals Mining ETF
ICOP
$428M
| $140K | ﹤0.01% |
2,838
-4,736
| -63% | -$247K |
2025 Q4
2 quarters
|
|
5158
CALL
iShares 25+ Year Treasury STRIPS Bond ETF
GOVZ
$381M
| $140K | ﹤0.01% |
+3,800
| New | +$137K |
2026 Q2
0 quarters
|
|
5159
Tradr 2X Long APP Daily ETF
APPX
$39.8M
| $140K | ﹤0.01% |
3,452
+2,273
| +193% | +$86.6K |
2026 Q1
1 quarter
|
|
5160
CALL
Beta Bionics
BBNX
$956M
| $139K | ﹤0.01% |
8,900
+3,700
| +71% | +$44K |
2025 Q4
2 quarters
|
|
5161
PUT
Teleflex
TFX
$5.99B
| $139K | ﹤0.01% |
1,100
| – | – |
2026 Q1
1 quarter
|
|
5162
CALL
Verra Mobility
VRRM
$508M
| $139K | ﹤0.01% |
32,800
-18,400
| -36% | -$194K |
2025 Q1
5 quarters
|
|
5163
Leverage Shares 2X Long AVGO Daily ETF
AVGG
$45M
| $139K | ﹤0.01% |
5,093
+2,872
| +129% | +$94.2K |
2026 Q1
1 quarter
|
|
5164
CALL
Skywest
SKYW
$3.7B
| $139K | ﹤0.01% |
1,400
-2,600
| -65% | -$231K |
2019 Q4
26 quarters
|
|
5165
PUT
Quantinuum Inc
QNT
$1.47B
| $139K | ﹤0.01% |
+1,700
| New | +$109K |
2026 Q2
0 quarters
|
|
5166
PUT
Altimmune
ALT
$416M
| $139K | ﹤0.01% |
45,700
-29,300
| -39% | -$87.5K |
2021 Q1
21 quarters
|
|
5167
CALL
Chiron Real Estate Inc
XRN
$404M
| $139K | ﹤0.01% |
3,700
+3,000
| +429% | +$106K |
2019 Q3
27 quarters
|
|
5168
Freshworks
FRSH
$3.92B
| $139K | ﹤0.01% |
13,709
+11,069
| +419% | +$98.6K |
2024 Q1
9 quarters
|
|
5169
CALL
Harmony Biosciences
HRMY
$2.25B
| $138K | ﹤0.01% |
3,800
-14,400
| -79% | -$454K |
2026 Q1
1 quarter
|
|
5170
Plexus
PLXS
$5.77B
| $138K | ﹤0.01% |
460
-18,227
| -98% | -$4.75M |
2025 Q4
2 quarters
|
|
5171
CALL
WESCO International
WCC
$17.9B
| $138K | ﹤0.01% |
400
-2,000
| -83% | -$679K |
2018 Q2
32 quarters
|
|
5172
CALL
Designer Brands
DBI
$348M
| $138K | ﹤0.01% |
23,700
+23,500
| +11,750% | +$165K |
2017 Q1
37 quarters
|
|
5173
CALL
Kyverna Therapeutics
KYTX
$362M
| $138K | ﹤0.01% |
15,500
-12,300
| -44% | -$109K |
2025 Q2
4 quarters
|
|
5174
CALL
Akebia Therapeutics
AKBA
$206M
| $138K | ﹤0.01% |
121,000
+39,900
| +49% | +$47.5K |
2018 Q2
32 quarters
|
|
5175
CALL
Septerna Inc
SEPN
$2.11B
| $137K | ﹤0.01% |
4,100
+1,700
| +71% | +$48.2K |
2025 Q1
5 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.