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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 | |
|---|---|---|---|---|---|---|---|
2826
CALL
Rapid7
RPD
$987M
| $918K | ﹤0.01% |
75,100
+11,600
| +18% | +$134K |
2018 Q1
34 quarters
|
|
2827
CALL
Satellogic
SATL
$542M
| $917K | ﹤0.01% |
165,900
+46,200
| +39% | +$226K |
2024 Q4
7 quarters
|
|
2828
PUT
Paycom
PAYC
$11.2B
| $914K | ﹤0.01% |
4,200
-9,700
| -70% | -$1.89M |
2015 Q2
45 quarters
|
|
2829
CALL
InMode
INMD
$759M
| $911K | ﹤0.01% |
64,300
-1,100
| -2% | -$16.4K |
2020 Q1
26 quarters
|
|
2830
CALL
Adaptive Biotechnologies
ADPT
$4.77B
| $910K | ﹤0.01% |
31,500
+9,900
| +46% | +$243K |
2026 Q1
2 quarters
|
|
2831
Teladoc Health
TDOC
$1.58B
| $909K | ﹤0.01% |
156,703
-8,015
| -5% | -$58.6K |
2024 Q3
8 quarters
|
|
2832
CRH
CRH
$62.5B
| $908K | ﹤0.01% |
+10,965
| New | +$1.05M |
2026 Q3
0 quarters
|
|
2833
CALL
Trevi Therapeutics
TRVI
$1.94B
| $908K | ﹤0.01% |
63,400
+13,300
| +27% | +$229K |
2024 Q4
7 quarters
|
|
2834
PUT
Performance Food Group
PFGC
$17.3B
| $906K | ﹤0.01% |
9,900
-9,100
| -48% | -$953K |
2024 Q2
9 quarters
|
|
2835
Glaukos
GKOS
$14.6B
| $905K | ﹤0.01% |
+5,514
| New | +$922K |
2026 Q3
0 quarters
|
|
2836
CALL
Halozyme
HALO
$11.5B
| $905K | ﹤0.01% |
8,200
-14,200
| -63% | -$1.37M |
2021 Q2
21 quarters
|
|
2837
PUT
Brookfield
BN
$93B
| $904K | ﹤0.01% |
24,800
-9,300
| -27% | -$384K |
2023 Q1
14 quarters
|
|
2838
PUT
BWX Technologies
BWXT
$11.4B
| $904K | ﹤0.01% |
6,600
-14,900
| -69% | -$2.43M |
2019 Q3
28 quarters
|
|
2839
FMC
FMC
$787M
| $901K | ﹤0.01% |
101,065
+44,861
| +80% | +$490K |
2025 Q1
6 quarters
|
|
2840
CALL
Nice
NICE
$5.4B
| $901K | ﹤0.01% |
8,100
+1,400
| +21% | +$143K |
2018 Q2
33 quarters
|
|
2841
DELISTED
Apollo Commercial Real Estate
ARI
| $901K | ﹤0.01% |
145,323
+57,862
| +66% | +$421K |
2026 Q1
2 quarters
|
|
2842
PUT
Clover Health Investments
CLOV
$2.61B
| $900K | ﹤0.01% |
208,900
-115,800
| -36% | -$519K |
2026 Q1
2 quarters
|
|
2843
PUT
Insulet
PODD
$10.4B
| $900K | ﹤0.01% |
6,900
+6,800
| +6,800% | +$1.02M |
2026 Q2
1 quarter
|
|
2844
PUT
Tidewater
TDW
$3.87B
| $900K | ﹤0.01% |
11,100
-1,100
| -9% | -$92.6K |
2022 Q1
18 quarters
|
|
2845
Okta
OKTA
$31.9B
| $900K | ﹤0.01% |
4,302
-41,655
| -91% | -$6.59M |
2025 Q3
4 quarters
|
|
2846
CALL
Academy Sports + Outdoors
ASO
$4.14B
| $899K | ﹤0.01% |
18,700
+4,900
| +36% | +$233K |
2026 Q1
2 quarters
|
|
2847
PUT
Huntington Bancshares
HBAN
$31.7B
| $899K | ﹤0.01% |
58,900
+28,000
| +91% | +$479K |
2015 Q2
45 quarters
|
|
2848
PUT
NewMarket
NEU
$6.46B
| $898K | ﹤0.01% |
+1,000
| New | +$863K |
2026 Q3
0 quarters
|
|
2849
CALL
UWM Holdings
UWMC
$877M
| $896K | ﹤0.01% |
759,700
+181,700
| +31% | +$292K |
2020 Q4
23 quarters
|
|
2850
CALL
Aecom
ACM
$9.02B
| $896K | ﹤0.01% |
15,200
-900
| -6% | -$60K |
2015 Q4
43 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.