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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 | |
|---|---|---|---|---|---|---|---|
5076
PUT
Crexendo
CXDO
$166M
| $136K | ﹤0.01% |
23,200
-29,900
| -56% | -$198K |
2024 Q3
8 quarters
|
|
5077
PUT
Scotiabank
BNS
$113B
| $136K | ﹤0.01% |
1,500
-1,500
| -50% | -$135K |
2019 Q4
27 quarters
|
|
5078
Arcus Biosciences
RCUS
$2.56B
| $136K | ﹤0.01% |
+5,268
| New | +$149K |
2026 Q3
0 quarters
|
|
5079
Crane NXT
CXT
$3.28B
| $136K | ﹤0.01% |
2,888
-4,441
| -61% | -$224K |
2026 Q1
2 quarters
|
|
5080
PUT
Loews
L
$22.6B
| $136K | ﹤0.01% |
1,300
-600
| -32% | -$67.2K |
2025 Q2
5 quarters
|
|
5081
PUT
Yeti Holdings
YETI
$2.79B
| $135K | ﹤0.01% |
3,300
-4,400
| -57% | -$202K |
2021 Q1
22 quarters
|
|
5082
PUT
Sportradar
SRAD
$3.82B
| $135K | ﹤0.01% |
11,700
-21,400
| -65% | -$291K |
2021 Q4
19 quarters
|
|
5083
Nexstar Media Group
NXST
$6.35B
| $135K | ﹤0.01% |
837
+506
| +153% | +$90.7K |
2026 Q1
2 quarters
|
|
5084
PUT
Global X MSCI Norway ETF
NORW
$91.4M
| $135K | ﹤0.01% |
3,100
+2,100
| +210% | +$74.8K |
2017 Q2
37 quarters
|
|
5085
Hycroft Mining Holding Corp
HYMC
$1.58B
| $135K | ﹤0.01% |
+7,082
| New | +$160K |
2026 Q3
0 quarters
|
|
5086
PUT
Tompkins Financial
TMP
$1.44B
| $135K | ﹤0.01% |
1,400
-2,500
| -64% | -$243K |
2025 Q4
3 quarters
|
|
5087
PUT
Alto Ingredients
ALTO
$288M
| $135K | ﹤0.01% |
36,500
+26,500
| +265% | +$119K |
2025 Q1
6 quarters
|
|
5088
PUT
Hess Midstream
HESM
$3.92B
| $135K | ﹤0.01% |
3,600
-1,100
| -23% | -$43.6K |
2021 Q1
22 quarters
|
|
5089
CALL
TransUnion
TRU
$15.4B
| $134K | ﹤0.01% |
2,200
-8,900
| -80% | -$695K |
2019 Q2
29 quarters
|
|
5090
CALL
Franklin Electric
FELE
$4.31B
| $134K | ﹤0.01% |
1,400
+1,100
| +367% | +$113K |
2026 Q1
2 quarters
|
|
5091
CALL
AGNT Inc
AGNT
$441M
| $134K | ﹤0.01% |
36,500
+35,100
| +2,507% | +$148K |
2020 Q3
24 quarters
|
|
5092
CALL
Zura Bio
ZURA
$119M
| $134K | ﹤0.01% |
32,200
+8,400
| +35% | +$44.9K |
2025 Q3
4 quarters
|
|
5093
iShares MSCI Global Silver and Metals Miners ETF
SLVP
$744M
| $134K | ﹤0.01% |
3,827
-13,565
| -78% | -$480K |
2025 Q2
5 quarters
|
|
5094
PUT
Xometry
XMTR
$6.96B
| $134K | ﹤0.01% |
+1,300
| New | +$120K |
2026 Q3
0 quarters
|
|
5095
CALL
International General Insurance
IGIC
$1.01B
| $134K | ﹤0.01% |
5,500
-6,100
| -53% | -$163K |
2026 Q1
2 quarters
|
|
5096
Atmos Energy
ATO
$29.7B
| $134K | ﹤0.01% |
854
-667
| -44% | -$113K |
2026 Q2
1 quarter
|
|
5097
Mission Produce
AVO
$1.01B
| $134K | ﹤0.01% |
10,184
+1,379
| +16% | +$17.8K |
2025 Q3
4 quarters
|
|
5098
PUT
Valaris
VAL
$5.6B
| $133K | ﹤0.01% |
1,700
+100
| +6% | +$8.15K |
2022 Q1
18 quarters
|
|
5099
PUT
Cognex
CGNX
$8.55B
| $133K | ﹤0.01% |
2,200
-600
| -21% | -$37.6K |
2016 Q2
41 quarters
|
|
5100
Zillow
ZG
$6.56B
| $133K | ﹤0.01% |
4,817
+3,243
| +206% | +$108K |
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.