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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 | |
|---|---|---|---|---|---|---|---|
2876
nVent Electric
NVT
$18.7B
| $881K | ﹤0.01% |
5,492
-7,006
| -56% | -$1.1M |
2025 Q4
3 quarters
|
|
2877
PUT
A.O. Smith
AOS
$8.59B
| $879K | ﹤0.01% |
15,600
+400
| +3% | +$24.1K |
2017 Q4
35 quarters
|
|
2878
PUT
Match Group
MTCH
$9.5B
| $879K | ﹤0.01% |
21,900
+1,400
| +7% | +$56K |
2021 Q2
21 quarters
|
|
2879
Galicia Financial Group
GGAL
$4.66B
| $878K | ﹤0.01% |
23,580
+11,609
| +97% | +$531K |
2026 Q1
2 quarters
|
|
2880
PUT
Delek US
DK
$4.15B
| $878K | ﹤0.01% |
12,300
+12,100
| +6,050% | +$808K |
2017 Q3
36 quarters
|
|
2881
Diamondback Energy
FANG
$50.9B
| $877K | ﹤0.01% |
+4,772
| New | +$934K |
2026 Q3
0 quarters
|
|
2882
PUT
abrdn Physical Palladium Shares ETF
PALL
$519M
| $877K | ﹤0.01% |
40,200
+33,800
| +528% | +$799K |
2025 Q1
6 quarters
|
|
2883
PUT
Qiagen
QGEN
$10.3B
| $875K | ﹤0.01% |
20,000
-13,600
| -40% | -$577K |
2024 Q3
8 quarters
|
|
2884
Lattice Semiconductor
LSCC
$16.9B
| $875K | ﹤0.01% |
6,967
-88
| -1% | -$10.9K |
2025 Q4
3 quarters
|
|
2885
Vanguard World Funds Extended Duration ETF
EDV
$3.79B
| $875K | ﹤0.01% |
15,783
+7,663
| +94% | +$462K |
2026 Q2
1 quarter
|
|
2886
Reinsurance Group of America
RGA
$17.8B
| $875K | ﹤0.01% |
3,554
+3,546
| +44,325% | +$858K |
2026 Q2
1 quarter
|
|
2887
PUT
Illinois Tool Works
ITW
$81.5B
| $875K | ﹤0.01% |
3,400
+2,600
| +325% | +$722K |
2015 Q3
44 quarters
|
|
2888
CALL
Celcuity
CELC
$3.14B
| $875K | ﹤0.01% |
11,000
-5,800
| -35% | -$528K |
2025 Q1
6 quarters
|
|
2889
PUT
Incyte
INCY
$24.8B
| $874K | ﹤0.01% |
7,200
+3,700
| +106% | +$451K |
2021 Q2
21 quarters
|
|
2890
PUT
Relay Therapeutics
RLAY
$3.99B
| $874K | ﹤0.01% |
48,400
+32,600
| +206% | +$625K |
2025 Q4
3 quarters
|
|
2891
Seagate
STX
$125B
| $873K | ﹤0.01% |
947
+248
| +35% | +$212K |
2026 Q1
2 quarters
|
|
2892
PUT
Dropbox
DBX
$7.21B
| $873K | ﹤0.01% |
25,800
+23,300
| +932% | +$771K |
2018 Q2
33 quarters
|
|
2893
CALL
Mesoblast
MESO
$1.7B
| $873K | ﹤0.01% |
59,600
-14,300
| -19% | -$227K |
2021 Q1
22 quarters
|
|
2894
PUT
Veradermics Inc
MANE
$5.71B
| $873K | ﹤0.01% |
+7,200
| New | +$787K |
2026 Q3
0 quarters
|
|
2895
PUT
Arbor Realty Trust
ABR
$239M
| $873K | ﹤0.01% |
226,100
-321,200
| -59% | -$1.58M |
2018 Q2
33 quarters
|
|
2896
PUT
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$270M
| $871K | ﹤0.01% |
7,800
+4,700
| +152% | +$322K |
2018 Q1
34 quarters
|
|
2897
PUT
Vornado Realty Trust
VNO
$6.49B
| $871K | ﹤0.01% |
25,700
+14,300
| +125% | +$542K |
2015 Q2
45 quarters
|
|
2898
CALL
Alpha Tau Medical
DRTS
$1.24B
| $869K | ﹤0.01% |
58,300
-48,800
| -46% | -$673K |
2025 Q4
3 quarters
|
|
2899
CALL
Acadia Healthcare
ACHC
$3.52B
| $869K | ﹤0.01% |
31,600
+5,400
| +21% | +$162K |
2026 Q1
2 quarters
|
|
2900
PUT
Aaon
AAON
$6.5B
| $869K | ﹤0.01% |
10,500
+10,300
| +5,150% | +$927K |
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.