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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 | |
|---|---|---|---|---|---|---|---|
2901
CALL
Prime Medicine
PRME
$706M
| $869K | ﹤0.01% |
284,400
+88,000
| +45% | +$292K |
2023 Q4
11 quarters
|
|
2902
Freshworks
FRSH
$3.32B
| $868K | ﹤0.01% |
67,892
+54,183
| +395% | +$646K |
2024 Q1
10 quarters
|
|
2903
CALL
Krispy Kreme
DNUT
$644M
| $868K | ﹤0.01% |
302,500
-13,200
| -4% | -$43K |
2021 Q4
19 quarters
|
|
2904
PUT
Global E Online
GLBE
$6.9B
| $866K | ﹤0.01% |
21,800
+14,800
| +211% | +$576K |
2021 Q4
19 quarters
|
|
2905
CALL
The RealReal
REAL
$1.78B
| $865K | ﹤0.01% |
97,900
-40,400
| -29% | -$436K |
2019 Q3
28 quarters
|
|
2906
Crescent Energy
CRGY
$5.09B
| $865K | ﹤0.01% |
67,139
+19,051
| +40% | +$233K |
2026 Q2
1 quarter
|
|
2907
A2Z Smart Technologies
AZ
$275M
| $865K | ﹤0.01% |
150,477
+64,038
| +74% | +$389K |
2026 Q1
2 quarters
|
|
2908
CALL
Polestar Automotive Holding UK
PSNY
$700M
| $865K | ﹤0.01% |
132,300
+1,500
| +1% | +$19K |
2022 Q2
17 quarters
|
|
2909
CALL
Tsakos Energy Navigation Ltd
TEN
$1.42B
| $865K | ﹤0.01% |
18,300
+8,200
| +81% | +$347K |
2026 Q1
2 quarters
|
|
2910
CALL
NCR Voyix
VYX
$1.35B
| $864K | ﹤0.01% |
126,300
+66,300
| +111% | +$535K |
2014 Q4
47 quarters
|
|
2911
Kanzhun
BZ
$5.47B
| $864K | ﹤0.01% |
58,366
+54,127
| +1,277% | +$844K |
2025 Q4
3 quarters
|
|
2912
OneSpan
OSPN
$828M
| $864K | ﹤0.01% |
48,214
+20,364
| +73% | +$329K |
2025 Q4
3 quarters
|
|
2913
DeFi Development Corp
DFDV
$96.2M
| $863K | ﹤0.01% |
160,621
+43,144
| +37% | +$172K |
2026 Q1
2 quarters
|
|
2914
CALL
Vanguard FTSE Developed Markets ETF
VEA
$229B
| $861K | ﹤0.01% |
12,200
-56,300
| -82% | -$4.04M |
2018 Q1
34 quarters
|
|
2915
iShares Global Clean Energy ETF
ICLN
$2.01B
| $861K | ﹤0.01% |
50,672
+12,308
| +32% | +$222K |
2026 Q1
2 quarters
|
|
2916
PUT
PureCycle Technologies
PCT
$362M
| $860K | ﹤0.01% |
194,900
-285,500
| -59% | -$1.83M |
2021 Q2
21 quarters
|
|
2917
PUT
Atlanta Braves Holdings Series B
BATRK
$3.38B
| $859K | ﹤0.01% |
15,200
+11,300
| +290% | +$582K |
2023 Q3
12 quarters
|
|
2918
CALL
CryoPort
CYRX
$1.02B
| $858K | ﹤0.01% |
49,300
+24,300
| +97% | +$388K |
2018 Q2
33 quarters
|
|
2919
CALL
Planet Fitness
PLNT
$4.47B
| $857K | ﹤0.01% |
20,300
+6,700
| +49% | +$342K |
2015 Q4
43 quarters
|
|
2920
PUT
Murphy USA
MUSA
$9.7B
| $857K | ﹤0.01% |
1,700
+700
| +70% | +$391K |
2025 Q3
4 quarters
|
|
2921
Obsidian Energy
OBE
$640M
| $857K | ﹤0.01% |
83,170
+81,422
| +4,658% | +$864K |
2026 Q2
1 quarter
|
|
2922
CALL
Carpenter Technology
CRS
$14.8B
| $855K | ﹤0.01% |
2,200
-3,500
| -61% | -$1.78M |
2019 Q1
30 quarters
|
|
2923
PUT
Intellia Therapeutics
NTLA
$1.48B
| $855K | ﹤0.01% |
70,900
+28,300
| +66% | +$354K |
2017 Q1
38 quarters
|
|
2924
Wendy's
WEN
$1.56B
| $855K | ﹤0.01% |
133,998
-122,871
| -48% | -$948K |
2025 Q3
4 quarters
|
|
2925
Unusual Machines
UMAC
$614M
| $855K | ﹤0.01% |
34,919
+22,556
| +182% | +$524K |
2026 Q2
1 quarter
|
|
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.