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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 | |
|---|---|---|---|---|---|---|---|
2651
Invesco DB US Dollar Index Bullish Fund
UUP
$487M
| $1.07M | ﹤0.01% |
+37,306
| New | +$1.05M |
2026 Q3
0 quarters
|
|
2652
Viavi Solutions
VIAV
$8.12B
| $1.07M | ﹤0.01% |
25,587
+910
| +4% | +$35.3K |
2026 Q1
2 quarters
|
|
2653
PUT
Capital Southwest
CSWC
$1.58B
| $1.07M | ﹤0.01% |
46,200
+31,300
| +210% | +$757K |
2020 Q3
24 quarters
|
|
2654
Virgin Galactic
SPCE
$435M
| $1.07M | ﹤0.01% |
356,577
+261,598
| +275% | +$759K |
2026 Q1
2 quarters
|
|
2655
Webull Corp
BULL
$2.73B
| $1.07M | ﹤0.01% |
+152,832
| New | +$1.22M |
2026 Q3
0 quarters
|
|
2656
CALL
Invesco
IVZ
$12.6B
| $1.06M | ﹤0.01% |
35,300
-22,000
| -38% | -$677K |
2014 Q4
47 quarters
|
|
2657
CALL
Oceaneering
OII
$3.5B
| $1.06M | ﹤0.01% |
24,400
+19,900
| +442% | +$947K |
2020 Q2
25 quarters
|
|
2658
Recursion Pharmaceuticals
RXRX
$2.24B
| $1.06M | ﹤0.01% |
257,685
+93,999
| +57% | +$319K |
2026 Q1
2 quarters
|
|
2659
Pagaya Technologies
PGY
$1.45B
| $1.06M | ﹤0.01% |
61,374
-7,263
| -11% | -$143K |
2026 Q2
1 quarter
|
|
2660
CALL
Helus Pharma Inc. Common Stock
HELP
$686M
| $1.06M | ﹤0.01% |
86,400
-182,900
| -68% | -$1.91M |
2024 Q4
7 quarters
|
|
2661
CALL
Navios Maritime Partners
NMM
$2.55B
| $1.06M | ﹤0.01% |
11,800
+4,200
| +55% | +$349K |
2026 Q1
2 quarters
|
|
2662
PUT
Zymeworks
ZYME
$2.05B
| $1.06M | ﹤0.01% |
40,000
+1,000
| +3% | +$25.9K |
2018 Q4
31 quarters
|
|
2663
CALL
Littelfuse
LFUS
$10.1B
| $1.06M | ﹤0.01% |
2,500
-100
| -4% | -$42.2K |
2026 Q1
2 quarters
|
|
2664
iShares US Medical Devices ETF
IHI
$4.07B
| $1.06M | ﹤0.01% |
20,709
-33,481
| -62% | -$1.77M |
2026 Q2
1 quarter
|
|
2665
PUT
Lantheus
LNTH
$6.64B
| $1.06M | ﹤0.01% |
10,600
+6,400
| +152% | +$653K |
2019 Q4
27 quarters
|
|
2666
CALL
Illinois Tool Works
ITW
$82.1B
| $1.05M | ﹤0.01% |
4,100
-1,700
| -29% | -$472K |
2016 Q3
40 quarters
|
|
2667
W.P. Carey
WPC
$14.9B
| $1.05M | ﹤0.01% |
16,292
+6,289
| +63% | +$446K |
2026 Q1
2 quarters
|
|
2668
NextNav
NN
$1.44B
| $1.05M | ﹤0.01% |
73,130
+29,095
| +66% | +$447K |
2026 Q1
2 quarters
|
|
2669
CALL
Northern Trust
NTRS
$32.4B
| $1.05M | ﹤0.01% |
6,200
+3,300
| +114% | +$603K |
2026 Q2
1 quarter
|
|
2670
CALL
Praxis Precision Medicines
PRAX
$9.7B
| $1.05M | ﹤0.01% |
3,600
+900
| +33% | +$298K |
2026 Q1
2 quarters
|
|
2671
CALL
Pegasystems
PEGA
$5.14B
| $1.05M | ﹤0.01% |
31,500
+12,200
| +63% | +$404K |
2023 Q3
12 quarters
|
|
2672
CALL
NioCorp Developments
NB
$428M
| $1.05M | ﹤0.01% |
290,900
+157,400
| +118% | +$679K |
2025 Q1
6 quarters
|
|
2673
CALL
Arbor Realty Trust
ABR
$256M
| $1.04M | ﹤0.01% |
270,500
-43,300
| -14% | -$213K |
2018 Q2
33 quarters
|
|
2674
Alpha Metallurgical Resources
AMR
$1.99B
| $1.04M | ﹤0.01% |
6,203
+1,037
| +20% | +$181K |
2026 Q1
2 quarters
|
|
2675
CALL
Woodside Energy
WDS
$40.4B
| $1.04M | ﹤0.01% |
47,000
+2,300
| +5% | +$51.7K |
2022 Q2
17 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.