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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 | |
|---|---|---|---|---|---|---|---|
3101
PUT
Avantor
AVTR
$10.6B
| $733K | ﹤0.01% |
48,700
+8,300
| +21% | +$111K |
2019 Q2
29 quarters
|
|
3102
PUT
Celldex Therapeutics
CLDX
$2.24B
| $732K | ﹤0.01% |
22,600
+21,500
| +1,955% | +$822K |
2026 Q1
2 quarters
|
|
3103
CALL
Bath & Body Works
BBWI
$4.25B
| $732K | ﹤0.01% |
46,000
-62,300
| -58% | -$1.19M |
2021 Q4
19 quarters
|
|
3104
CALL
Sonoco
SON
$4.81B
| $732K | ﹤0.01% |
15,000
+14,000
| +1,400% | +$765K |
2019 Q1
30 quarters
|
|
3105
CALL
Atlanta Braves Holdings Series B
BATRK
$3.38B
| $732K | ﹤0.01% |
13,400
-8,700
| -39% | -$448K |
2024 Q3
8 quarters
|
|
3106
CALL
Marqeta
MQ
$1.87B
| $729K | ﹤0.01% |
42,900
+27,300
| +175% | +$451K |
2021 Q4
19 quarters
|
|
3107
Senseonics Holdings Inc
SENS
$550M
| $729K | ﹤0.01% |
71,680
+70,330
| +5,210% | +$529K |
2026 Q2
1 quarter
|
|
3108
PUT
Sunoco
SUN
$12.2B
| $729K | ﹤0.01% |
10,000
+5,400
| +117% | +$402K |
2015 Q2
45 quarters
|
|
3109
BellRing Brands
BRBR
$1.19B
| $728K | ﹤0.01% |
94,623
-74,764
| -44% | -$825K |
2026 Q1
2 quarters
|
|
3110
PUT
Newsmax Inc
NMAX
$942M
| $728K | ﹤0.01% |
67,300
-101,200
| -60% | -$974K |
2025 Q2
5 quarters
|
|
3111
PUT
Nabors Industries
NBR
$1.36B
| $727K | ﹤0.01% |
9,300
| – | – |
2015 Q3
44 quarters
|
|
3112
CALL
Stride
LRN
$3.17B
| $725K | ﹤0.01% |
9,300
-1,500
| -14% | -$126K |
2019 Q1
30 quarters
|
|
3113
CALL
TripAdvisor
TRIP
$854M
| $725K | ﹤0.01% |
86,600
-117,100
| -57% | -$1.33M |
2014 Q4
47 quarters
|
|
3114
PUT
Ovintiv
OVV
$17.4B
| $723K | ﹤0.01% |
12,500
-2,000
| -14% | -$122K |
2020 Q1
26 quarters
|
|
3115
PUT
Boost Run Inc
BRUN
$471M
| $723K | ﹤0.01% |
43,800
+4,200
| +11% | +$86.1K |
2026 Q2
1 quarter
|
|
3116
Hertz
HTZ
$550M
| $721K | ﹤0.01% |
+431,587
| New | +$859K |
2026 Q3
0 quarters
|
|
3117
CALL
Martin Marietta Materials
MLM
$36.8B
| $720K | ﹤0.01% |
1,500
+1,200
| +400% | +$643K |
2014 Q4
47 quarters
|
|
|
3118
PUT
Martin Marietta Materials
MLM
$36.8B
| $720K | ﹤0.01% |
1,500
+200
| +15% | +$107K |
2014 Q4
47 quarters
|
|
3119
CALL
Versigent PLC
VGNT
$3.01B
| $719K | ﹤0.01% |
16,000
+14,000
| +700% | +$624K |
2026 Q2
1 quarter
|
|
3120
PUT
Portillo's
PTLO
$486M
| $718K | ﹤0.01% |
203,500
+32,500
| +19% | +$144K |
2021 Q4
19 quarters
|
|
|
3121
CALL
Portillo's
PTLO
$486M
| $717K | ﹤0.01% |
203,100
+41,300
| +26% | +$183K |
2021 Q4
19 quarters
|
|
3122
PUT
LKQ Corp
LKQ
$4.97B
| $717K | ﹤0.01% |
31,400
+29,000
| +1,208% | +$718K |
2018 Q1
34 quarters
|
|
3123
Direxion Daily Financial Bear 3x ETF
FAZ
$78.3M
| $717K | ﹤0.01% |
18,124
+7,702
| +74% | +$257K |
2025 Q1
6 quarters
|
|
3124
PUT
DELISTED
CBIZ
CBZ
| $716K | ﹤0.01% |
13,100
+7,900
| +152% | +$397K |
2025 Q4
3 quarters
|
|
3125
CALL
Pinnacle West Capital
PNW
$13B
| $716K | ﹤0.01% |
7,700
+4,000
| +108% | +$402K |
2018 Q2
33 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.