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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 | |
|---|---|---|---|---|---|---|---|
2776
CALL
Intellia Therapeutics
NTLA
$1.6B
| $955K | ﹤0.01% |
79,200
+17,500
| +28% | +$219K |
2017 Q2
37 quarters
|
|
2777
ResMed
RMD
$33.6B
| $955K | ﹤0.01% |
4,319
-9,770
| -69% | -$2.13M |
2026 Q2
1 quarter
|
|
2778
CALL
Mueller Industries
MLI
$12B
| $952K | ﹤0.01% |
15,700
+13,900
| +772% | +$866K |
2021 Q2
21 quarters
|
|
2779
CALL
Leidos
LDOS
$16.3B
| $950K | ﹤0.01% |
7,800
-300
| -4% | -$37.5K |
2016 Q1
42 quarters
|
|
2780
PUT
UP Fintech Holding
TIGR
$723M
| $950K | ﹤0.01% |
206,900
-40,700
| -16% | -$196K |
2020 Q3
24 quarters
|
|
2781
CALL
Zymeworks
ZYME
$2.05B
| $948K | ﹤0.01% |
35,800
+35,200
| +5,867% | +$912K |
2019 Q1
30 quarters
|
|
2782
CALL
Brinker International
EAT
$8.34B
| $948K | ﹤0.01% |
4,900
+100
| +2% | +$21.1K |
2016 Q2
41 quarters
|
|
2783
CALL
Globant
GLOB
$2B
| $947K | ﹤0.01% |
27,300
+25,400
| +1,337% | +$914K |
2018 Q3
32 quarters
|
|
2784
CALL
Bending Spoons S.p.A. Ordinary Shares
BSP
$26.6B
| $946K | ﹤0.01% |
+28,400
| New | +$1.08M |
2026 Q3
0 quarters
|
|
2785
CALL
MiniMed Group Inc
MMED
$5.13B
| $946K | ﹤0.01% |
48,600
+45,800
| +1,636% | +$880K |
2026 Q2
1 quarter
|
|
2786
PUT
Kimco Realty
KIM
$17B
| $946K | ﹤0.01% |
42,600
-9,700
| -19% | -$236K |
2017 Q1
38 quarters
|
|
2787
CALL
Amcor
AMCR
$20.5B
| $946K | ﹤0.01% |
22,600
-27,900
| -55% | -$1.25M |
2019 Q4
27 quarters
|
|
2788
Perpetua Resources
PPTA
$2.37B
| $946K | ﹤0.01% |
43,851
+26,057
| +146% | +$578K |
2025 Q3
4 quarters
|
|
2789
CALL
Scorpio Tankers
STNG
$4.19B
| $946K | ﹤0.01% |
11,300
+7,600
| +205% | +$603K |
2021 Q1
22 quarters
|
|
2790
PUT
InterDigital
IDCC
$7.74B
| $946K | ﹤0.01% |
2,900
+1,300
| +81% | +$406K |
2021 Q2
21 quarters
|
|
2791
BBB Foods
TBBB
$8.14B
| $946K | ﹤0.01% |
17,962
+8,552
| +91% | +$394K |
2025 Q1
6 quarters
|
|
2792
Amer Sports
AS
$18.1B
| $945K | ﹤0.01% |
34,643
-7,888
| -19% | -$253K |
2025 Q4
3 quarters
|
|
2793
EntrepreneurShares Series Trust ERShares Private-Public Crossover ETF
XOVR
$1.42B
| $944K | ﹤0.01% |
+44,201
| New | +$898K |
2026 Q3
0 quarters
|
|
2794
CALL
Patterson-UTI
PTEN
$3.95B
| $943K | ﹤0.01% |
86,400
+34,200
| +66% | +$375K |
2018 Q2
33 quarters
|
|
2795
PUT
Full Truck Alliance
YMM
$9.09B
| $942K | ﹤0.01% |
113,900
+79,600
| +232% | +$698K |
2021 Q4
19 quarters
|
|
2796
PUT
EHang Holdings
EH
$302M
| $941K | ﹤0.01% |
223,000
+207,300
| +1,320% | +$1.06M |
2021 Q1
22 quarters
|
|
2797
PUT
IQVIA
IQV
$45.2B
| $941K | ﹤0.01% |
3,500
-7,900
| -69% | -$1.91M |
2026 Q2
1 quarter
|
|
2798
CALL
RELX
RELX
$69.6B
| $939K | ﹤0.01% |
28,300
-2,100
| -7% | -$72.4K |
2025 Q1
6 quarters
|
|
2799
Skyworks Solutions
SWKS
$20.6B
| $938K | ﹤0.01% |
10,970
-768
| -7% | -$54.1K |
2026 Q2
1 quarter
|
|
2800
Quantum Computing Inc
QUBT
$1.4B
| $936K | ﹤0.01% |
110,778
+32,244
| +41% | +$272K |
2025 Q4
3 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.