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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 | |
|---|---|---|---|---|---|---|---|
3026
CALL
Remitly
RELY
$4.88B
| $785K | ﹤0.01% |
36,800
+5,100
| +16% | +$122K |
2021 Q4
19 quarters
|
|
|
TGR
3027
PUT
DELISTED
ISHARES TARGET DATE RETIREMENT INCOME ETF
TGR
| $784K | ﹤0.01% |
19,300
-2,500
| -11% | -$102K |
2017 Q4
35 quarters
|
|
3028
PUT
Greenland Energy Co
GLND
$88.3M
| $783K | ﹤0.01% |
+152,600
| New | +$313K |
2026 Q3
0 quarters
|
|
3029
PUT
Jumia Technologies
JMIA
$752M
| $783K | ﹤0.01% |
117,700
-55,100
| -32% | -$366K |
2019 Q2
29 quarters
|
|
3030
CALL
Blackstone Secured Lending
BXSL
$5.52B
| $782K | ﹤0.01% |
32,600
-73,100
| -69% | -$1.77M |
2022 Q4
15 quarters
|
|
3031
CALL
Fidelity National Information Services
FIS
$14.6B
| $780K | ﹤0.01% |
23,700
-5,800
| -20% | -$235K |
2026 Q1
2 quarters
|
|
3032
PUT
Grayscale Bitcoin Mini Trust ETF
BTC
$3.78B
| $780K | ﹤0.01% |
21,100
+8,600
| +69% | +$271K |
2026 Q1
2 quarters
|
|
3033
PUT
Morningstar
MORN
$9.13B
| $779K | ﹤0.01% |
4,100
| – | – |
2026 Q2
1 quarter
|
|
3034
PUT
Carpenter Technology
CRS
$14.8B
| $778K | ﹤0.01% |
2,000
-100
| -5% | -$50.8K |
2026 Q1
2 quarters
|
|
3035
Embraer S.A. ADS
EMBJ
$14.1B
| $777K | ﹤0.01% |
10,319
+6,221
| +152% | +$445K |
2026 Q2
1 quarter
|
|
3036
PUT
Evergy
EVRG
$20.7B
| $777K | ﹤0.01% |
9,900
+9,200
| +1,314% | +$762K |
2019 Q1
30 quarters
|
|
3037
Goodyear
GT
$1.16B
| $775K | ﹤0.01% |
156,024
-60,831
| -28% | -$379K |
2022 Q2
17 quarters
|
|
3038
PUT
BorgWarner
BWA
$10.2B
| $775K | ﹤0.01% |
12,900
-26,300
| -67% | -$1.7M |
2015 Q1
46 quarters
|
|
3039
CALL
USA Compression Partners
USAC
$3.61B
| $773K | ﹤0.01% |
31,100
-25,100
| -45% | -$664K |
2021 Q2
21 quarters
|
|
3040
PUT
Tyson Foods
TSN
$20.8B
| $773K | ﹤0.01% |
15,300
-1,500
| -9% | -$84.1K |
2014 Q4
47 quarters
|
|
3041
CALL
Westlake Corp
WLK
$8.03B
| $773K | ﹤0.01% |
12,400
+7,800
| +170% | +$578K |
2016 Q3
40 quarters
|
|
3042
CALL
Sunoco
SUN
$12.2B
| $772K | ﹤0.01% |
10,600
+1,500
| +16% | +$112K |
2018 Q2
33 quarters
|
|
3043
PUT
Arrow Electronics
ARW
$10B
| $772K | ﹤0.01% |
+3,400
| New | +$722K |
2026 Q3
0 quarters
|
|
3044
CALL
Vor Biopharma
VOR
$1.19B
| $771K | ﹤0.01% |
+40,400
| New | +$862K |
2026 Q3
0 quarters
|
|
3045
CALL
DELISTED
Velo3D, Inc.
VLD
| $769K | ﹤0.01% |
70,600
+37,300
| +112% | +$406K |
2026 Q1
2 quarters
|
|
3046
PUT
Cogent Biosciences
COGT
$5.07B
| $768K | ﹤0.01% |
24,000
-20,600
| -46% | -$761K |
2025 Q2
5 quarters
|
|
3047
CALL
Dana Inc
DAN
$2.32B
| $767K | ﹤0.01% |
28,100
| – | – |
2017 Q2
37 quarters
|
|
3048
CALL
Marriott Vacations Worldwide
VAC
$3.96B
| $767K | ﹤0.01% |
7,500
-5,000
| -40% | -$523K |
2026 Q1
2 quarters
|
|
3049
Teekay Tankers
TNK
$3.07B
| $766K | ﹤0.01% |
+7,893
| New | +$665K |
2026 Q3
0 quarters
|
|
3050
Fabrinet
FN
$12.6B
| $766K | ﹤0.01% |
1,805
-126
| -7% | -$57.8K |
2024 Q4
7 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.