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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
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
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
4151
CALL
CACI
CACI
$14.1B
| $305K | ﹤0.01% |
+500
| New | +$288K |
2026 Q3
0 quarters
|
|
4152
PUT
Freshworks
FRSH
$3.33B
| $304K | ﹤0.01% |
23,800
+22,400
| +1,600% | +$267K |
2021 Q4
19 quarters
|
|
4153
Fox Class B
FOX
$25.3B
| $304K | ﹤0.01% |
5,406
+832
| +18% | +$46.3K |
2026 Q2
1 quarter
|
|
4154
PUT
Ericsson
ERIC
$34.2B
| $304K | ﹤0.01% |
33,200
-46,400
| -58% | -$469K |
2026 Q1
2 quarters
|
|
4155
CALL
Sabre
SABR
$755M
| $303K | ﹤0.01% |
143,100
-8,700
| -6% | -$17.8K |
2016 Q4
39 quarters
|
|
4156
CALL
TransAlta
TAC
$4.18B
| $303K | ﹤0.01% |
25,100
-56,800
| -69% | -$721K |
2023 Q2
13 quarters
|
|
4157
PUT
Array Technologies
ARRY
$744M
| $303K | ﹤0.01% |
75,200
-37,900
| -34% | -$194K |
2020 Q4
23 quarters
|
|
4158
CALL
Chemed
CHE
$7.12B
| $303K | ﹤0.01% |
600
+400
| +200% | +$207K |
2026 Q1
2 quarters
|
|
4159
CALL
Amrize Ltd
AMRZ
$21.9B
| $303K | ﹤0.01% |
8,100
-9,000
| -53% | -$411K |
2025 Q3
4 quarters
|
|
4160
PUT
Alpha Metallurgical Resources
AMR
$1.95B
| $303K | ﹤0.01% |
1,800
-5,800
| -76% | -$1.01M |
2026 Q1
2 quarters
|
|
4161
CALL
Jack in the Box
JACK
$283M
| $303K | ﹤0.01% |
22,900
+11,400
| +99% | +$178K |
2014 Q4
47 quarters
|
|
4162
CALL
DeFi Development Corp
DFDV
$95.9M
| $303K | ﹤0.01% |
79,000
+28,300
| +56% | +$113K |
2025 Q2
5 quarters
|
|
4163
PUT
Ecolab
ECL
$86.7B
| $302K | ﹤0.01% |
1,100
-8,500
| -89% | -$2.36M |
2018 Q1
34 quarters
|
|
4164
PUT
Equifax
EFX
$22B
| $302K | ﹤0.01% |
2,200
+1,600
| +267% | +$278K |
2015 Q3
44 quarters
|
|
4165
Lantheus
LNTH
$6.64B
| $301K | ﹤0.01% |
3,029
-439
| -13% | -$44.8K |
2025 Q4
3 quarters
|
|
4166
CALL
TORM
TRMD
$3.75B
| $301K | ﹤0.01% |
7,900
-33,100
| -81% | -$1.05M |
2022 Q3
16 quarters
|
|
4167
Bath & Body Works
BBWI
$4.31B
| $301K | ﹤0.01% |
18,879
+3,734
| +25% | +$71.5K |
2025 Q1
6 quarters
|
|
4168
CALL
Dolby
DLB
$5.9B
| $300K | ﹤0.01% |
5,100
+5,000
| +5,000% | +$288K |
2026 Q1
2 quarters
|
|
4169
CALL
American Exceptionalism Acquisition Corp
AEXA
$534M
| $300K | ﹤0.01% |
26,900
-152,200
| -85% | -$1.75M |
2026 Q1
2 quarters
|
|
4170
CALL
Levi Strauss
LEVI
$9.31B
| $299K | ﹤0.01% |
15,200
-13,800
| -48% | -$309K |
2019 Q1
30 quarters
|
|
4171
CALL
Getty Realty Corp
GTY
$1.92B
| $299K | ﹤0.01% |
10,600
+9,100
| +607% | +$299K |
2020 Q2
25 quarters
|
|
4172
CALL
DELISTED
AXS Change Finance ESG ETF
CHGX
| $299K | ﹤0.01% |
5,500
-41,100
| -88% | -$2.24M |
2026 Q1
2 quarters
|
|
4173
Novanta
NOVT
$4.39B
| $299K | ﹤0.01% |
2,103
-3,677
| -64% | -$545K |
2026 Q2
1 quarter
|
|
4174
PUT
Vitesse Energy
VTS
$646M
| $299K | ﹤0.01% |
17,900
-1,900
| -10% | -$31.4K |
2023 Q2
13 quarters
|
|
4175
PUT
Ecopetrol
EC
$30.9B
| $298K | ﹤0.01% |
18,100
-67,400
| -79% | -$1.12M |
2020 Q4
23 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.