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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 | |
|---|---|---|---|---|---|---|---|
4026
PUT
ZTO Express
ZTO
$15.2B
| $338K | ﹤0.01% |
17,400
-35,600
| -67% | -$792K |
2021 Q2
21 quarters
|
|
4027
PUT
Olin
OLN
$1.97B
| $338K | ﹤0.01% |
21,800
+12,600
| +137% | +$239K |
2021 Q2
21 quarters
|
|
4028
Starwood Property Trust
STWD
$4.14B
| $337K | ﹤0.01% |
24,999
+21,387
| +592% | +$342K |
2026 Q2
1 quarter
|
|
4029
Roundhill AMD WeeklyPay ETF
AMDW
$127M
| $337K | ﹤0.01% |
+3,298
| New | +$298K |
2026 Q3
0 quarters
|
|
4030
CALL
Itron
ITRI
$4.23B
| $337K | ﹤0.01% |
3,900
-24,400
| -86% | -$2.28M |
2022 Q3
16 quarters
|
|
4031
PUT
LENZ Therapeutics
LENZ
$128M
| $336K | ﹤0.01% |
87,400
+79,300
| +979% | +$395K |
2025 Q3
4 quarters
|
|
4032
PUT
Ambev
ABEV
$42.7B
| $336K | ﹤0.01% |
114,900
-100
| -0.1% | -$298 |
2021 Q2
21 quarters
|
|
4033
CALL
BioAge Labs
BIOA
$251M
| $335K | ﹤0.01% |
47,200
-3,300
| -7% | -$45.7K |
2025 Q3
4 quarters
|
|
4034
CALL
Vishay Precision Group
VPG
$665M
| $335K | ﹤0.01% |
4,600
+3,100
| +207% | +$251K |
2025 Q2
5 quarters
|
|
4035
PUT
Darling Ingredients
DAR
$8.56B
| $334K | ﹤0.01% |
5,500
-5,000
| -48% | -$314K |
2018 Q2
33 quarters
|
|
4036
CALL
Magnolia Oil & Gas
MGY
$6.47B
| $334K | ﹤0.01% |
14,200
+14,000
| +7,000% | +$363K |
2025 Q1
6 quarters
|
|
4037
Invesco Solar ETF
TAN
$905M
| $333K | ﹤0.01% |
7,583
-11,968
| -61% | -$599K |
2026 Q1
2 quarters
|
|
4038
CALL
Atomera
ATOM
$106M
| $333K | ﹤0.01% |
76,400
-54,800
| -42% | -$278K |
2020 Q3
24 quarters
|
|
4039
PUT
TechnipFMC
FTI
$25.4B
| $333K | ﹤0.01% |
4,900
-300
| -6% | -$22.1K |
2018 Q1
34 quarters
|
|
|
TUZ
4040
CALL
DELISTED
PIMCO 1-3 Year U.S. Treasury Index Exchange-Traded Fund
TUZ
| $333K | ﹤0.01% |
6,800
-43,700
| -87% | -$2.14M |
2022 Q1
18 quarters
|
|
4041
Collegium Pharmaceutical
COLL
$776M
| $332K | ﹤0.01% |
15,231
+11,315
| +289% | +$330K |
2026 Q1
2 quarters
|
|
4042
CALL
LegalZoom.com
LZ
$824M
| $332K | ﹤0.01% |
59,200
+15,800
| +36% | +$103K |
2021 Q4
19 quarters
|
|
4043
PUT
Universal Display
OLED
$4B
| $331K | ﹤0.01% |
4,300
-3,700
| -46% | -$304K |
2014 Q4
47 quarters
|
|
4044
LGI Homes
LGIH
$965M
| $331K | ﹤0.01% |
7,096
-7,316
| -51% | -$409K |
2026 Q1
2 quarters
|
|
4045
Illinois Tool Works
ITW
$81.7B
| $331K | ﹤0.01% |
+1,285
| New | +$357K |
2026 Q3
0 quarters
|
|
4046
PUT
Lincoln Educational Services
LINC
$699M
| $330K | ﹤0.01% |
+15,100
| New | +$516K |
2026 Q3
0 quarters
|
|
4047
CALL
Procure Space ETF
UFO
$454M
| $330K | ﹤0.01% |
7,800
-40,400
| -84% | -$1.82M |
2025 Q4
3 quarters
|
|
4048
Verisk Analytics
VRSK
$27B
| $330K | ﹤0.01% |
1,966
+875
| +80% | +$163K |
2025 Q4
3 quarters
|
|
4049
CALL
Talos Energy
TALO
$2.67B
| $330K | ﹤0.01% |
20,200
+1,000
| +5% | +$15.7K |
2019 Q4
27 quarters
|
|
4050
FS KKR Capital
FSK
$3.18B
| $330K | ﹤0.01% |
+30,001
| New | +$344K |
2026 Q3
0 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.