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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 | |
|---|---|---|---|---|---|---|---|
1026
PUT
Infleqtion Inc
INFQ
$2.12B
| $6.38M | ﹤0.01% |
473,900
+60,300
| +15% | +$728K |
2026 Q1
2 quarters
|
|
1027
CALL
Sprouts Farmers Market
SFM
$4.66B
| $6.38M | ﹤0.01% |
96,200
+41,600
| +76% | +$3.25M |
2021 Q2
21 quarters
|
|
1028
PUT
Fastly Inc
FSLY
$2.78B
| $6.37M | ﹤0.01% |
248,200
+143,900
| +138% | +$3.32M |
2019 Q2
29 quarters
|
|
1029
CALL
L3Harris
LHX
$51.5B
| $6.37M | ﹤0.01% |
26,900
+9,400
| +54% | +$2.56M |
2020 Q1
26 quarters
|
|
1030
AstraZeneca
AZN
$288B
| $6.36M | ﹤0.01% |
39,390
+32,427
| +466% | +$5.4M |
2026 Q1
2 quarters
|
|
1031
PUT
Synopsys
SNPS
$88.6B
| $6.35M | ﹤0.01% |
14,600
-28,400
| -66% | -$11.6M |
2018 Q2
33 quarters
|
|
1032
PUT
Blue Owl Capital
OWL
$7.06B
| $6.33M | ﹤0.01% |
696,800
+160,200
| +30% | +$1.68M |
2021 Q1
22 quarters
|
|
1033
CALL
ASE Group
ASX
$83.5B
| $6.32M | ﹤0.01% |
142,100
+18,600
| +15% | +$729K |
2023 Q3
12 quarters
|
|
1034
CALL
Colgate-Palmolive
CL
$77.9B
| $6.31M | ﹤0.01% |
74,000
+29,200
| +65% | +$2.64M |
2014 Q4
47 quarters
|
|
1035
PUT
Amplify Online Retail ETF
IBUY
$126M
| $6.28M | ﹤0.01% |
220,700
-1,300
| -0.6% | -$92.2K |
2019 Q4
27 quarters
|
|
1036
PUT
Equinix
EQIX
$106B
| $6.27M | ﹤0.01% |
6,200
-11,100
| -64% | -$11.5M |
2014 Q4
47 quarters
|
|
1037
PUT
Calumet Specialty Products
CLMT
$3.16B
| $6.25M | ﹤0.01% |
119,300
-83,800
| -41% | -$3.96M |
2017 Q2
37 quarters
|
|
1038
PUT
Bunge Global
BG
$19.3B
| $6.24M | ﹤0.01% |
58,300
+23,100
| +66% | +$2.64M |
2014 Q4
47 quarters
|
|
1039
CALL
Barclays
BCS
$76.9B
| $6.23M | ﹤0.01% |
256,800
-38,500
| -13% | -$1.04M |
2021 Q2
21 quarters
|
|
1040
CALL
DELISTED
Kenvue
KVUE
| $6.23M | ﹤0.01% |
352,800
-247,800
| -41% | -$4.66M |
2023 Q2
13 quarters
|
|
1041
PUT
Toast
TOST
$19.8B
| $6.21M | ﹤0.01% |
214,300
-106,400
| -33% | -$3.43M |
2021 Q4
19 quarters
|
|
1042
PUT
Rubrik
RBRK
$22.7B
| $6.2M | ﹤0.01% |
54,200
-22,800
| -30% | -$2.1M |
2024 Q2
9 quarters
|
|
1043
CALL
Deutsche Bank
DB
$69.2B
| $6.19M | ﹤0.01% |
172,400
+53,400
| +45% | +$2M |
2021 Q1
22 quarters
|
|
1044
CALL
Ametek
AME
$55B
| $6.17M | ﹤0.01% |
24,900
+18,900
| +315% | +$4.56M |
2018 Q1
34 quarters
|
|
1045
CALL
Progressive
PGR
$135B
| $6.16M | ﹤0.01% |
29,700
+2,300
| +8% | +$497K |
2021 Q2
21 quarters
|
|
1046
PUT
The Gap Inc
GAP
$7.56B
| $6.15M | ﹤0.01% |
269,300
+153,400
| +132% | +$3.17M |
2015 Q2
45 quarters
|
|
1047
PUT
Best Buy
BBY
$22.1B
| $6.14M | ﹤0.01% |
69,600
-24,600
| -26% | -$2.12M |
2021 Q2
21 quarters
|
|
1048
CALL
argenx
ARGX
$61.5B
| $6.14M | ﹤0.01% |
6,400
+900
| +16% | +$846K |
2021 Q4
19 quarters
|
|
1049
PUT
S&P Global
SPGI
$138B
| $6.12M | ﹤0.01% |
23,400
+5,300
| +29% | +$2.24M |
2021 Q1
22 quarters
|
|
1050
PUT
Definium Therapeutics
DFTX
$4.63B
| $6.12M | ﹤0.01% |
160,700
+58,000
| +56% | +$2.44M |
2021 Q2
21 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.