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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 | |
|---|---|---|---|---|---|---|---|
1901
CALL
FuboTV Inc
FUBO
$238M
| $2.2M | ﹤0.01% |
245,200
-26,100
| -10% | -$260K |
2020 Q4
23 quarters
|
|
1902
CALL
Trex
TREX
$5.42B
| $2.2M | ﹤0.01% |
50,400
+21,700
| +76% | +$989K |
2015 Q3
44 quarters
|
|
1903
PUT
FormFactor
FORM
$7.51B
| $2.19M | ﹤0.01% |
14,700
+9,800
| +200% | +$1.12M |
2024 Q4
7 quarters
|
|
1904
CALL
Virgin Galactic
SPCE
$435M
| $2.19M | ﹤0.01% |
733,300
+37,100
| +5% | +$108K |
2026 Q1
2 quarters
|
|
1905
CALL
Celanese
CE
$5.65B
| $2.19M | ﹤0.01% |
49,400
+16,200
| +49% | +$740K |
2018 Q2
33 quarters
|
|
1906
PUT
United States Natural Gas Fund
UNG
$628M
| $2.19M | ﹤0.01% |
211,300
+88,600
| +72% | +$924K |
2021 Q2
21 quarters
|
|
1907
PUT
Carlisle Companies
CSL
$15.4B
| $2.19M | ﹤0.01% |
6,800
+6,500
| +2,167% | +$2.26M |
2026 Q2
1 quarter
|
|
1908
CALL
AngloGold Ashanti
AU
$46.5B
| $2.19M | ﹤0.01% |
23,300
-26,700
| -53% | -$2.54M |
2021 Q2
21 quarters
|
|
1909
PUT
Genmab
GMAB
$33.1B
| $2.19M | ﹤0.01% |
61,300
+13,200
| +27% | +$418K |
2022 Q4
15 quarters
|
|
1910
CALL
Ichor Holdings
ICHR
$1.41B
| $2.18M | ﹤0.01% |
35,300
+29,300
| +488% | +$2.04M |
2025 Q1
6 quarters
|
|
1911
PUT
Groupon
GRPN
$521M
| $2.18M | ﹤0.01% |
110,500
-43,400
| -28% | -$987K |
2017 Q4
35 quarters
|
|
1912
CALL
nLIGHT
LASR
$2.59B
| $2.18M | ﹤0.01% |
56,000
+33,500
| +149% | +$1.8M |
2025 Q1
6 quarters
|
|
1913
PUT
Cal-Maine
CALM
$3.12B
| $2.18M | ﹤0.01% |
32,000
+6,900
| +27% | +$559K |
2021 Q2
21 quarters
|
|
1914
Invesco DB Base Metals Fund
DBB
$356M
| $2.17M | ﹤0.01% |
85,905
+16,987
| +25% | +$428K |
2026 Q1
2 quarters
|
|
1915
PUT
Opendoor
OPEN
$1.27B
| $2.17M | ﹤0.01% |
902,000
-649,400
| -42% | -$2.33M |
2020 Q3
24 quarters
|
|
1916
PUT
Cummins
CMI
$63.5B
| $2.17M | ﹤0.01% |
4,200
-700
| -14% | -$422K |
2014 Q4
47 quarters
|
|
1917
DigitalOcean
DOCN
$10.3B
| $2.17M | ﹤0.01% |
16,248
-8,304
| -34% | -$1.04M |
2026 Q1
2 quarters
|
|
1918
CALL
Lincoln National
LNC
$8.1B
| $2.17M | ﹤0.01% |
53,800
-14,100
| -21% | -$601K |
2014 Q4
47 quarters
|
|
1919
Southwest Airlines
LUV
$22.8B
| $2.17M | ﹤0.01% |
52,004
+44,064
| +555% | +$1.93M |
2026 Q2
1 quarter
|
|
1920
CALL
Vishay Intertechnology
VSH
$4.47B
| $2.15M | ﹤0.01% |
66,200
+24,500
| +59% | +$858K |
2018 Q2
33 quarters
|
|
1921
JBS N.V.
JBS
$13.3B
| $2.15M | ﹤0.01% |
190,672
+9,072
| +5% | +$116K |
2026 Q2
1 quarter
|
|
1922
Ascendis Pharma A/S
ASND
$17.1B
| $2.15M | ﹤0.01% |
9,419
+1,144
| +14% | +$290K |
2026 Q2
1 quarter
|
|
1923
Wells Fargo
WFC
$258B
| $2.15M | ﹤0.01% |
26,807
-16,902
| -39% | -$1.46M |
2026 Q1
2 quarters
|
|
1924
Alcoa
AA
$10.8B
| $2.14M | ﹤0.01% |
51,032
+22,443
| +79% | +$1.07M |
2024 Q3
8 quarters
|
|
1925
PUT
Emerson Electric
EMR
$93.2B
| $2.14M | ﹤0.01% |
13,800
+3,400
| +33% | +$512K |
2014 Q4
47 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.