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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 | |
|---|---|---|---|---|---|---|---|
226
PUT
Datadog
DDOG
$64.5B
| $54.3M | 0.03% |
198,400
+69,800
| +54% | +$17.3M |
2019 Q4
27 quarters
|
|
227
PUT
Reddit
RDDT
$19B
| $53.8M | 0.03% |
377,400
+44,400
| +13% | +$7.34M |
2024 Q1
10 quarters
|
|
228
PUT
AbbVie
ABBV
$520B
| $53.5M | 0.03% |
204,500
+63,200
| +45% | +$16.2M |
2014 Q4
47 quarters
|
|
229
CALL
Johnson & Johnson
JNJ
$677B
| $52.8M | 0.03% |
199,400
+12,700
| +7% | +$3.35M |
2014 Q4
47 quarters
|
|
|
KFYP
230
PUT
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $52.7M | 0.03% |
2,180,400
-515,600
| -19% | -$12.5M |
2017 Q2
37 quarters
|
|
231
PUT
Circle Internet Group
CRCL
$16.7B
| $52.6M | 0.03% |
640,500
+140,700
| +28% | +$10.9M |
2025 Q2
5 quarters
|
|
232
PUT
Visa
V
$790B
| $52.1M | 0.03% |
144,900
-138,000
| -49% | -$50.4M |
2014 Q4
47 quarters
|
|
233
Microsoft
MSFT
$3.96T
| $51.9M | 0.03% |
101,122
-96,406
| -49% | -$44.6M |
2025 Q3
4 quarters
|
|
234
PUT
Vistra
VST
$44.3B
| $51.8M | 0.03% |
374,300
+155,600
| +71% | +$22.9M |
2018 Q3
32 quarters
|
|
235
PUT
Coherent
COHR
$42.1B
| $51.5M | 0.03% |
179,100
+5,500
| +3% | +$1.65M |
2020 Q1
26 quarters
|
|
236
PUT
Newmont
NEM
$125B
| $51.4M | 0.03% |
445,500
-5,100
| -1% | -$571K |
2021 Q2
21 quarters
|
|
237
CALL
Home Depot
HD
$350B
| $51.2M | 0.03% |
180,100
+76,200
| +73% | +$25M |
2021 Q2
21 quarters
|
|
238
Roundhill Memory ETF
DRAM
$18.9B
| $51.1M | 0.03% |
846,867
+221,311
| +35% | +$12.6M |
2026 Q2
1 quarter
|
|
239
CALL
DELISTED
Warner Bros
WBD
| $50.9M | 0.03% |
1,644,000
+973,600
| +145% | +$27M |
2022 Q2
17 quarters
|
|
240
CALL
Texas Instruments
TXN
$274B
| $50.7M | 0.03% |
181,100
+6,500
| +4% | +$1.8M |
2021 Q1
22 quarters
|
|
241
CALL
KLA
KLAC
$199B
| $49.7M | 0.03% |
255,000
+168,200
| +194% | +$33M |
2014 Q4
47 quarters
|
|
242
PUT
Charles Schwab
SCHW
$161B
| $49.7M | 0.03% |
508,200
+224,500
| +79% | +$23.6M |
2021 Q2
21 quarters
|
|
243
CALL
Carnival Corporation Ltd
CCL
$41.3B
| $49.3M | 0.03% |
2,009,500
+694,900
| +53% | +$17.8M |
2021 Q2
21 quarters
|
|
|
244
SPDR Gold Trust
GLD
$135B
| $49.3M | 0.03% |
129,431
+52,954
| +69% | +$20.7M |
2026 Q1
2 quarters
|
|
245
PUT
McDonald's
MCD
$199B
| $49.2M | 0.03% |
213,100
+88,700
| +71% | +$23.3M |
2021 Q2
21 quarters
|
|
246
CALL
Applovin
APP
$131B
| $49.1M | 0.03% |
169,000
+8,100
| +5% | +$2.98M |
2021 Q2
21 quarters
|
|
247
CALL
Corning
GLW
$96.3B
| $49M | 0.03% |
318,800
+4,400
| +1% | +$699K |
2015 Q3
44 quarters
|
|
248
PUT
Marathon Digital Holdings
MARA
$2.8B
| $48.7M | 0.03% |
4,299,900
+937,200
| +28% | +$10.8M |
2020 Q2
25 quarters
|
|
249
PUT
Strive Inc
ASST
$2.73B
| $48.7M | 0.03% |
1,634,900
-95,000
| -5% | -$1.76M |
2025 Q2
5 quarters
|
|
250
PUT
Arista Networks
ANET
$235B
| $48.6M | 0.03% |
238,800
-16,900
| -7% | -$3.18M |
2021 Q2
21 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.