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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 | |
|---|---|---|---|---|---|---|---|
3426
Warner Music
WMG
$16.6B
| $560K | ﹤0.01% |
20,266
+16,859
| +495% | +$465K |
2026 Q2
1 quarter
|
|
3427
Xenon Pharmaceuticals
XENE
$4.03B
| $560K | ﹤0.01% |
+15,045
| New | +$894K |
2026 Q3
0 quarters
|
|
3428
Militia Long/Short Equity ETF
ORR
$361M
| $559K | ﹤0.01% |
14,806
+7,039
| +91% | +$268K |
2026 Q1
2 quarters
|
|
3429
CALL
Annexon
ANNX
$757M
| $558K | ﹤0.01% |
131,900
-74,700
| -36% | -$375K |
2024 Q1
10 quarters
|
|
3430
American Superconductor
AMSC
$1.21B
| $557K | ﹤0.01% |
19,135
+2,602
| +16% | +$81.6K |
2026 Q2
1 quarter
|
|
3431
PUT
Old Dominion Freight Line
ODFL
$35.4B
| $556K | ﹤0.01% |
3,200
+100
| +3% | +$20.5K |
2026 Q1
2 quarters
|
|
3432
Zscaler
ZS
$31.5B
| $556K | ﹤0.01% |
2,787
-17,725
| -86% | -$3.02M |
2025 Q1
6 quarters
|
|
3433
PUT
Scholar Rock
SRRK
$5.27B
| $556K | ﹤0.01% |
11,500
+3,800
| +49% | +$200K |
2022 Q1
18 quarters
|
|
3434
Dan IVES Wedbush AI Revolution ETF
IVES
$964M
| $556K | ﹤0.01% |
+13,536
| New | +$522K |
2026 Q3
0 quarters
|
|
3435
Kiniksa Pharmaceuticals
KNSA
$7.56B
| $556K | ﹤0.01% |
7,447
+2,849
| +62% | +$210K |
2026 Q1
2 quarters
|
|
3436
PUT
Texas Pacific Land
TPL
$19.4B
| $554K | ﹤0.01% |
1,700
-3,000
| -64% | -$1.13M |
2026 Q1
2 quarters
|
|
3437
CALL
Toll Brothers
TOL
$13.6B
| $552K | ﹤0.01% |
4,100
-12,500
| -75% | -$1.82M |
2014 Q4
47 quarters
|
|
3438
CALL
Chemours
CC
$2.01B
| $552K | ﹤0.01% |
40,700
-60,500
| -60% | -$974K |
2015 Q4
43 quarters
|
|
3439
CALL
Huazhu Hotels Group
HTHT
$15.8B
| $552K | ﹤0.01% |
12,900
| – | – |
2015 Q4
43 quarters
|
|
3440
CALL
BRC Inc
BRCC
$241M
| $552K | ﹤0.01% |
60,900
+49,610
| +439% | +$485K |
2022 Q1
18 quarters
|
|
3441
PUT
Aura Minerals Inc
AUGO
$6.54B
| $551K | ﹤0.01% |
7,000
+3,000
| +75% | +$219K |
2025 Q4
3 quarters
|
|
3442
PUT
Ichor Holdings
ICHR
$1.39B
| $551K | ﹤0.01% |
8,900
+1,700
| +24% | +$118K |
2018 Q1
34 quarters
|
|
3443
PUT
Borr Drilling
BORR
$1.05B
| $550K | ﹤0.01% |
141,500
+35,900
| +34% | +$154K |
2022 Q2
17 quarters
|
|
3444
CALL
MBIA
MBI
$239M
| $550K | ﹤0.01% |
129,200
+74,700
| +137% | +$392K |
2021 Q2
21 quarters
|
|
3445
PUT
OGE Energy
OGE
$10.6B
| $550K | ﹤0.01% |
12,100
+10,500
| +656% | +$495K |
2024 Q4
7 quarters
|
|
3446
PUT
Unicycive Therapeutics
UNCY
$101M
| $549K | ﹤0.01% |
117,000
+22,400
| +24% | +$116K |
2026 Q1
2 quarters
|
|
3447
PUT
Alumis Inc
ALMS
$793M
| $549K | ﹤0.01% |
74,300
+60,900
| +454% | +$1.26M |
2025 Q2
5 quarters
|
|
3448
Victory Capital Holdings
VCTR
$7.69B
| $549K | ﹤0.01% |
+4,962
| New | +$525K |
2026 Q3
0 quarters
|
|
3449
PUT
ICICI Bank
IBN
$123B
| $548K | ﹤0.01% |
19,900
-14,300
| -42% | -$421K |
2021 Q2
21 quarters
|
|
3450
CALL
DTE Energy
DTE
$29B
| $548K | ﹤0.01% |
4,500
-9,400
| -68% | -$1.31M |
2017 Q3
36 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.