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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 | |
|---|---|---|---|---|---|---|---|
726
CALL
Darden Restaurants
DRI
$25.9B
| $10.7M | 0.01% |
55,500
+49,700
| +857% | +$10.4M |
2014 Q4
47 quarters
|
|
727
PUT
Zoom
ZM
$28.6B
| $10.7M | 0.01% |
118,100
+8,100
| +7% | +$772K |
2019 Q2
29 quarters
|
|
728
CALL
Natera
NTRA
$46.4B
| $10.7M | 0.01% |
25,900
-14,300
| -36% | -$4.49M |
2018 Q2
33 quarters
|
|
729
CALL
Veeva Systems
VEEV
$49.3B
| $10.7M | 0.01% |
37,500
-106,800
| -74% | -$25.1M |
2014 Q4
47 quarters
|
|
730
CALL
Tradr 2X Short AMZN Daily ETF
AMZO
$2.78M
| $10.7M | 0.01% |
701,900
+330,900
| +89% | +$4.95M |
2026 Q1
2 quarters
|
|
731
PUT
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$5.11B
| $10.7M | 0.01% |
148,700
-34,100
| -19% | -$2.32M |
2023 Q4
11 quarters
|
|
732
CALL
Rubrik
RBRK
$22.7B
| $10.6M | 0.01% |
92,800
-33,800
| -27% | -$3.11M |
2024 Q2
9 quarters
|
|
733
PUT
Shell
SHEL
$277B
| $10.6M | 0.01% |
111,600
+9,500
| +9% | +$857K |
2022 Q1
18 quarters
|
|
734
PUT
ArcelorMittal
MT
$49.8B
| $10.6M | 0.01% |
158,800
+111,100
| +233% | +$7.87M |
2014 Q4
47 quarters
|
|
735
CALL
Grab
GRAB
$13.4B
| $10.6M | 0.01% |
3,404,900
+495,600
| +17% | +$1.71M |
2021 Q4
19 quarters
|
|
736
PUT
SELLAS Life Sciences
SLS
$1.7B
| $10.6M | 0.01% |
859,400
+378,900
| +79% | +$4.75M |
2026 Q1
2 quarters
|
|
737
PUT
Celsius Holdings
CELH
$8.28B
| $10.6M | 0.01% |
385,800
+121,800
| +46% | +$3.61M |
2020 Q3
24 quarters
|
|
738
CALL
Live Nation Entertainment
LYV
$42.5B
| $10.5M | 0.01% |
62,300
-4,100
| -6% | -$732K |
2026 Q1
2 quarters
|
|
739
Circle Internet Group
CRCL
$17.2B
| $10.5M | 0.01% |
+128,138
| New | +$9.9M |
2026 Q3
0 quarters
|
|
740
PUT
On Holding
ONON
$11.6B
| $10.5M | 0.01% |
355,000
+170,400
| +92% | +$5.56M |
2021 Q4
19 quarters
|
|
741
PUT
Pan American Silver
PAAS
$16.2B
| $10.5M | 0.01% |
230,800
+108,400
| +89% | +$5.17M |
2014 Q4
47 quarters
|
|
742
CALL
Calumet Specialty Products
CLMT
$3.16B
| $10.5M | 0.01% |
200,200
+83,000
| +71% | +$3.93M |
2017 Q2
37 quarters
|
|
743
PUT
Norwegian Cruise Line
NCLH
$8.64B
| $10.5M | 0.01% |
714,400
+33,200
| +5% | +$581K |
2026 Q1
2 quarters
|
|
744
PUT
Kodiak Sciences
KOD
$6.87B
| $10.4M | 0.01% |
110,100
+107,100
| +3,570% | +$4.42M |
2025 Q3
4 quarters
|
|
745
PUT
Lucid Motors
LCID
$1.45B
| $10.4M | 0.01% |
2,561,500
+105,400
| +4% | +$596K |
2021 Q4
19 quarters
|
|
746
CALL
Viking Therapeutics
VKTX
$3.63B
| $10.4M | 0.01% |
319,500
+84,500
| +36% | +$2.93M |
2018 Q1
34 quarters
|
|
747
CALL
Archer Aviation
ACHR
$3.74B
| $10.4M | 0.01% |
2,094,700
+541,500
| +35% | +$2.95M |
2021 Q4
19 quarters
|
|
748
Bristol-Myers Squibb
BMY
$129B
| $10.4M | 0.01% |
166,646
+66,461
| +66% | +$4.2M |
2026 Q2
1 quarter
|
|
749
PUT
Trade Desk
TTD
$7.56B
| $10.4M | 0.01% |
851,000
+181,100
| +27% | +$2.84M |
2017 Q2
37 quarters
|
|
750
PUT
Etsy
ETSY
$7.62B
| $10.3M | 0.01% |
144,500
+21,400
| +17% | +$1.69M |
2016 Q3
40 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.