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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 | |
|---|---|---|---|---|---|---|---|
4976
CALL
The Zcash ETF
ZCSH
$123M
| $148K | ﹤0.01% |
+3,900
| New | +$124K |
2026 Q3
0 quarters
|
|
4977
CALL
Glaukos
GKOS
$14.6B
| $148K | ﹤0.01% |
900
-800
| -47% | -$134K |
2018 Q2
33 quarters
|
|
4978
CALL
Aveanna Healthcare
AVAH
$2.67B
| $148K | ﹤0.01% |
11,900
+10,700
| +892% | +$123K |
2026 Q1
2 quarters
|
|
4979
CALL
Hamilton Lane
HLNE
$5.24B
| $148K | ﹤0.01% |
1,700
+200
| +13% | +$18.6K |
2026 Q2
1 quarter
|
|
4980
PUT
Kennametal
KMT
$1.87B
| $148K | ﹤0.01% |
4,800
+1,300
| +37% | +$41.4K |
2026 Q1
2 quarters
|
|
4981
PUT
Bumble
BMBL
$931M
| $148K | ﹤0.01% |
56,100
-32,800
| -37% | -$94.3K |
2021 Q1
22 quarters
|
|
4982
CALL
Independent Bank
INDB
$3.9B
| $148K | ﹤0.01% |
+1,900
| New | +$158K |
2026 Q3
0 quarters
|
|
4983
PUT
Chord Energy
CHRD
$7.82B
| $147K | ﹤0.01% |
1,100
-10,500
| -91% | -$1.44M |
2014 Q4
47 quarters
|
|
4984
Nano Dimension
NNDM
$250M
| $147K | ﹤0.01% |
93,724
-14,307
| -13% | -$22.1K |
2023 Q2
13 quarters
|
|
4985
CALL
Ooma
OOMA
$498M
| $147K | ﹤0.01% |
7,200
+2,700
| +60% | +$57.7K |
2025 Q2
5 quarters
|
|
4986
CALL
Deluxe
DLX
$1.23B
| $147K | ﹤0.01% |
6,400
+4,800
| +300% | +$118K |
2018 Q2
33 quarters
|
|
4987
CALL
Radian Group
RDN
$4.63B
| $147K | ﹤0.01% |
4,800
+4,600
| +2,300% | +$169K |
2016 Q3
40 quarters
|
|
4988
TransUnion
TRU
$15.5B
| $147K | ﹤0.01% |
+2,399
| New | +$187K |
2026 Q3
0 quarters
|
|
4989
CALL
Azenta
AZTA
$1.83B
| $147K | ﹤0.01% |
4,200
+1,800
| +75% | +$55.4K |
2021 Q2
21 quarters
|
|
4990
Forum Energy Technologies
FET
$881M
| $147K | ﹤0.01% |
+1,810
| New | +$128K |
2026 Q3
0 quarters
|
|
4991
PUT
Adtran
ADTN
$396M
| $146K | ﹤0.01% |
21,400
+13,800
| +182% | +$123K |
2025 Q1
6 quarters
|
|
4992
PUT
MYR Group
MYRG
$4.34B
| $146K | ﹤0.01% |
500
-100
| -17% | -$33.6K |
2026 Q1
2 quarters
|
|
4993
PUT
Firy Inc
FIRY
$200M
| $146K | ﹤0.01% |
11,800
-19,000
| -62% | -$188K |
2020 Q3
24 quarters
|
|
4994
CALL
Unicycive Therapeutics
UNCY
$98.9M
| $146K | ﹤0.01% |
31,100
-2,800
| -8% | -$14.5K |
2025 Q4
3 quarters
|
|
4995
CALL
Enerflex
EFXT
$2.48B
| $146K | ﹤0.01% |
6,400
-4,400
| -41% | -$97.8K |
2026 Q2
1 quarter
|
|
4996
PUT
JFrog
FROG
$13.8B
| $146K | ﹤0.01% |
1,500
-100,000
| -99% | -$8.97M |
2020 Q3
24 quarters
|
|
4997
CALL
Archrock
AROC
$4.75B
| $145K | ﹤0.01% |
4,800
+900
| +23% | +$30.5K |
2018 Q2
33 quarters
|
|
4998
SailPoint Inc
SAIL
$11.9B
| $145K | ﹤0.01% |
7,134
-4,362
| -38% | -$78K |
2025 Q4
3 quarters
|
|
4999
iShares MSCI Chile ETF
ECH
$807M
| $145K | ﹤0.01% |
+3,839
| New | +$153K |
2026 Q3
0 quarters
|
|
5000
CALL
Denali Therapeutics
DNLI
$3.03B
| $145K | ﹤0.01% |
7,000
+3,300
| +89% | +$77.2K |
2026 Q2
1 quarter
|
|
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.