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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 | |
|---|---|---|---|---|---|---|---|
1701
PUT
Guardant Health
GH
$20.9B
| $2.69M | ﹤0.01% |
15,100
-18,600
| -55% | -$3.04M |
2019 Q1
30 quarters
|
|
1702
CALL
NexGen Energy
NXE
$5.58B
| $2.69M | ﹤0.01% |
295,200
-145,900
| -33% | -$1.43M |
2021 Q1
22 quarters
|
|
1703
CALL
Rollins
ROL
$18.5B
| $2.68M | ﹤0.01% |
89,100
-72,000
| -45% | -$2.7M |
2017 Q3
36 quarters
|
|
1704
CALL
Absci
ABSI
$1.74B
| $2.68M | ﹤0.01% |
248,900
+98,500
| +65% | +$902K |
2023 Q1
14 quarters
|
|
1705
On Holding
ONON
$11.6B
| $2.68M | ﹤0.01% |
90,390
+36,074
| +66% | +$1.18M |
2026 Q2
1 quarter
|
|
1706
CALL
WhiteFiber Inc
WYFI
$405M
| $2.68M | ﹤0.01% |
148,600
+90,500
| +156% | +$2.18M |
2025 Q3
4 quarters
|
|
1707
Newmont
NEM
$123B
| $2.67M | ﹤0.01% |
+23,160
| New | +$2.59M |
2026 Q3
0 quarters
|
|
1708
PUT
Omnicom Group
OMC
$24.4B
| $2.67M | ﹤0.01% |
36,200
+15,000
| +71% | +$1.23M |
2018 Q1
34 quarters
|
|
1709
CALL
TC Energy
TRP
$67B
| $2.66M | ﹤0.01% |
46,100
-17,000
| -27% | -$1.09M |
2018 Q2
33 quarters
|
|
1710
VanEck Junior Gold Miners ETF
GDXJ
$7.72B
| $2.66M | ﹤0.01% |
23,321
+10,435
| +81% | +$1.19M |
2026 Q2
1 quarter
|
|
1711
PUT
Whirlpool
WHR
$1.98B
| $2.66M | ﹤0.01% |
86,600
+26,800
| +45% | +$1.02M |
2021 Q1
22 quarters
|
|
1712
CALL
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$276M
| $2.66M | ﹤0.01% |
20,800
+7,200
| +53% | +$493K |
2017 Q1
38 quarters
|
|
1713
Invesco KBW Bank ETF
KBWB
$6.78B
| $2.65M | ﹤0.01% |
30,400
-2,629
| -8% | -$251K |
2026 Q1
2 quarters
|
|
1714
GFL Environmental
GFL
$18.9B
| $2.65M | ﹤0.01% |
+63,343
| New | +$2.6M |
2026 Q3
0 quarters
|
|
1715
CALL
Life Time Group Holdings
LTH
$10.7B
| $2.65M | ﹤0.01% |
66,400
+43,200
| +186% | +$1.84M |
2026 Q1
2 quarters
|
|
1716
PUT
Revolve Group
RVLV
$1.41B
| $2.65M | ﹤0.01% |
124,100
+123,700
| +30,925% | +$2.87M |
2019 Q2
29 quarters
|
|
1717
CALL
Seabridge Gold
SA
$2.74B
| $2.64M | ﹤0.01% |
143,900
-22,800
| -14% | -$669K |
2018 Q2
33 quarters
|
|
1718
CALL
Iron Mountain
IRM
$33.5B
| $2.64M | ﹤0.01% |
23,800
+800
| +3% | +$95.8K |
2021 Q2
21 quarters
|
|
1719
PUT
Gildan
GIL
$6.63B
| $2.63M | ﹤0.01% |
61,800
-12,000
| -16% | -$621K |
2025 Q4
3 quarters
|
|
1720
Deere & Co
DE
$187B
| $2.63M | ﹤0.01% |
3,915
+2,935
| +299% | +$1.87M |
2026 Q2
1 quarter
|
|
1721
PUT
Blackstone Secured Lending
BXSL
$5.61B
| $2.63M | ﹤0.01% |
109,600
+46,600
| +74% | +$1.13M |
2022 Q4
15 quarters
|
|
1722
PUT
Twist Bioscience
TWST
$8.13B
| $2.63M | ﹤0.01% |
13,600
+13,100
| +2,620% | +$1.62M |
2020 Q3
24 quarters
|
|
1723
CALL
Alight
ALIT
$323M
| $2.63M | ﹤0.01% |
294,500
+281,005
| +2,082% | +$4.32M |
2021 Q4
19 quarters
|
|
1724
PUT
Securitize Corp
SECZ
$1.48B
| $2.61M | ﹤0.01% |
+179,100
| New | +$1.5M |
2026 Q3
0 quarters
|
|
1725
PUT
Deckers Outdoor
DECK
$11.8B
| $2.6M | ﹤0.01% |
33,300
+15,700
| +89% | +$1.45M |
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.