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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 | |
|---|---|---|---|---|---|---|---|
1476
CALL
Skyworks Solutions
SWKS
$20.6B
| $3.43M | ﹤0.01% |
40,100
-34,500
| -46% | -$2.43M |
2014 Q4
47 quarters
|
|
1477
CALL
Penguin Solutions Inc
PENG
$2.52B
| $3.42M | ﹤0.01% |
62,500
-56,100
| -47% | -$3.18M |
2021 Q2
21 quarters
|
|
1478
CALL
Silicon Motion
SIMO
$6.23B
| $3.42M | ﹤0.01% |
12,200
-42,100
| -78% | -$11.2M |
2026 Q1
2 quarters
|
|
1479
Etsy
ETSY
$7.62B
| $3.41M | ﹤0.01% |
+47,662
| New | +$3.77M |
2026 Q3
0 quarters
|
|
1480
CALL
Cencora
COR
$66.8B
| $3.39M | ﹤0.01% |
11,300
-1,300
| -10% | -$408K |
2014 Q4
47 quarters
|
|
1481
Enterprise Products Partners
EPD
$80.1B
| $3.39M | ﹤0.01% |
+95,277
| New | +$3.64M |
2026 Q3
0 quarters
|
|
1482
CALL
SharonAI Holdings
SHAZ
$946M
| $3.39M | ﹤0.01% |
62,100
+28,700
| +86% | +$1.74M |
2026 Q2
1 quarter
|
|
1483
PUT
Hertz
HTZ
$586M
| $3.38M | ﹤0.01% |
2,024,100
+714,800
| +55% | +$1.42M |
2021 Q4
19 quarters
|
|
1484
PUT
Madrigal Pharmaceuticals
MDGL
$10.1B
| $3.38M | ﹤0.01% |
6,700
+3,100
| +86% | +$1.64M |
2026 Q1
2 quarters
|
|
1485
CALL
Avis
CAR
$4.5B
| $3.37M | ﹤0.01% |
31,600
-40,900
| -56% | -$5.72M |
2021 Q2
21 quarters
|
|
1486
PUT
Peloton Interactive
PTON
$2.55B
| $3.37M | ﹤0.01% |
675,200
-304,500
| -31% | -$1.7M |
2019 Q4
27 quarters
|
|
1487
CALL
TechnipFMC
FTI
$25.4B
| $3.37M | ﹤0.01% |
49,600
-60,000
| -55% | -$4.41M |
2016 Q1
42 quarters
|
|
1488
PUT
Tractor Supply
TSCO
$19.1B
| $3.36M | ﹤0.01% |
107,500
-116,100
| -52% | -$3.81M |
2015 Q2
45 quarters
|
|
1489
PUT
Alaska Air
ALK
$4.63B
| $3.36M | ﹤0.01% |
86,800
-6,000
| -6% | -$267K |
2021 Q2
21 quarters
|
|
1490
CALL
MasTec
MTZ
$15.2B
| $3.35M | ﹤0.01% |
15,700
+5,100
| +48% | +$1.43M |
2015 Q3
44 quarters
|
|
1491
PUT
CF Industries
CF
$18B
| $3.35M | ﹤0.01% |
29,100
-23,800
| -45% | -$2.93M |
2014 Q4
47 quarters
|
|
1492
PUT
Aon
AON
$71.4B
| $3.35M | ﹤0.01% |
12,100
+2,400
| +25% | +$812K |
2026 Q2
1 quarter
|
|
1493
CALL
Boston Properties
BXP
$10.1B
| $3.34M | ﹤0.01% |
54,700
-16,100
| -23% | -$1.08M |
2018 Q4
31 quarters
|
|
1494
PUT
Brookfield Asset Management
BAM
$84B
| $3.34M | ﹤0.01% |
74,900
+14,400
| +24% | +$703K |
2026 Q1
2 quarters
|
|
1495
CALL
Tradr 2X Long TTMI Daily ETF
TTMX
$75.6K
| $3.34M | ﹤0.01% |
+222,000
| New | +$2.33M |
2026 Q3
0 quarters
|
|
|
1496
PUT
SharonAI Holdings
SHAZ
$946M
| $3.34M | ﹤0.01% |
61,100
+57,300
| +1,508% | +$3.48M |
2026 Q2
1 quarter
|
|
1497
PUT
Digital Realty Trust
DLR
$68.5B
| $3.34M | ﹤0.01% |
19,000
-23,800
| -56% | -$4.42M |
2014 Q4
47 quarters
|
|
1498
PUT
ALPS REIT Dividend Dogs ETF
RDOG
$10.7M
| $3.33M | ﹤0.01% |
64,200
+22,800
| +55% | +$928K |
2014 Q4
47 quarters
|
|
1499
Keel Infrastructure Corp
KEEL
$1.28B
| $3.32M | ﹤0.01% |
941,332
-425,285
| -31% | -$1.63M |
2025 Q1
6 quarters
|
|
1500
CALL
Dominion Energy
D
$59.9B
| $3.32M | ﹤0.01% |
54,900
-28,600
| -34% | -$1.92M |
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.